28 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 Apex of the last segment rather broadly rounded and not separately

produced,beingexceededbythe anal valves, which lack compressed margins.

Preanalscale large,broad, the posteriormarginrounded-transverse, the lateralangle on eachside

somewhat

thickened or inflated.

Gonopods

as

shown

infigure13,

d

ande.

They

lackamedianplate, and the distal half of the posterior lobes are bent back outside the body withtheir tipsreachingabovethecoxaeof thenextpair oflegs.

Innergonopods simple, the tips greatly

drawn

out, almost hairlike (fig- 13, /)•

Coxae

of the fifthmalelegseach with an erect lobebentforward attheapex (fig. 13,g).

Type.—V.S.'^M.

^no. 1096.

TRIGONIULUS LUMBRICINUS

(Gerstaecker)

Spiroholus lumbricinus Gerstaecker, Gliederthier-fauna Sansibar, p. 516, 1873.

Thiswidespreadtropicalspecies

was

foundin St. Kitts,Dominica, Martinique, British Guiana, and

Dutch

Guiana.

SPIROSTROPHUS NARESI

(Pocock)

SpiroholusnaresiiPocock,Ann. and Mag. Nat.Hist., vol. 11,p.252, 1893.

This species

was

found in abundance in Dominica, Martinique, Guadeloupe, and St.Lucia.

Order MEROCHETA

Family

STRONGYLOSOMIDAE

ORTHOMORPHA COARCTATA

(Saussure) Polydesmn^coarctata Saussure, Mem. Myr. Mex.,p.297, i860.

This milliped

was

found in St. Eustatius, St. Kitts, St. Martins, Antigua,Guadeloupe, Dominica, Martinique,St. Lucia, Bequia,Car- riacou, Trinidad, and

Dutch

Guiana.

ONCIUROSOMA

sp.

Three 19-segmented specimens of this genus were collected about 70 kilometers

from

Paramaribo,

Dutch

Guiana, near the railwayto theCable Stationonthe

Surinam

River,

March

3,1932.

Althoughthey probablyrepresent a

new

species, as none exceeds II

mm

inlength,theirstructural characters,particularlythoseof the male,havenotfullydeveloped anditisinadvisableto give

them

spe- cificdesignation.

From

the

form

of thelateralkeels

and

thelastseg-

NO. 14 MILLIPEDS OF

WEST

INDIES

AND GUIANA — ^LOOMIS

29

ment

itisapparentthat they aremost closely related tothe genotype, O. neotropicum Silvestri.

Family CHELODESMIDAE AMPHELICTOGON

BIDENS,n. sp.

Plate I, fig.4

A

^maletype and

two

females were found near Arthurstown, Cat Island,January4, 1932, ina naturalpitinthe limestone rock,locally calleda^"bananahole^"

from

thefactthatbananasare plantedinthese pits,whichafford protection

from

theconstantwinds.

Diagnosis.-

—

^Judging

from

Chamberlin's description^ A. bahanii- ensisiscloselyrelated toA.bidensbut has only asingletoothonthe innersideof theposterioror ventral division of eachgonopod,whereas A.bidens has

two

teeth. Moreover,it isinferredthatA. bahamiensis

Fig. 14. Amphclictogonbidens. a,lateralkeel ofsegment15,male;b,gonopods.

conformstothegeneric descriptioninhaving oneor

two

teethonthe posteriormarginof the keels,but the keels of A. bidens arewithout marginalteeth.

Description.

—

^{Length 20}

^mm,

^{width 2.5}

^{mm. Male}

^{a little}

^more

slenderthanthe female.

Body

widestatthe second segmentinboth sexes.

In live specimens the head is chestnut-brown witha darker area between the antennae; first segment

brown

with the lateral angles almost white; segments 2 to 4 chestnut-brown with ^the posterior anglesnearly white, the othernonporiferoussegments, including seg-

'Bull.Mus. Comp.Zool., vol.62,pp. 231,232, 191

30

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 89

ment

20,uniform chestnut-brownthroughout, as are theantennaeand legs;poriferous segments with the entire keels and

some

of the ad- jacent area of the

dorsum

white.

The

median line of the body is

darkenedbytheinternal ganglionshowing throughthe body wall.

Head

withaverydeep median furrow onthe vertex.

Segments withthekeelswell developed and without any teeth on the caudalmarginas ascribedto

members

of thisgenus. Pore swell- ing longandthick (fig. 14,a).

Gonopods

as

shown

in figure14, b.

Sternum

betweenthe third legs of the male with

two

small, for- wardly directed processes.

The

fourthsternum withprocesses

more

rounded and not produced forward.

T3'^^.—

U.S.N.M.

no. 1097.

ANTILLODESMUS VINCENTI

(Pocock)

Odontopeltis v'mcenti Pocock, Journ. Linn. Soc. London,vol. 24, p. 514, 1894.

A. grenadanusChamberlin, Bull. Mus. Comp.Zool., vol. 62, pp. 236, 237, 1918.

Three males andthree femaleswerecollected inGrenada, February 10, 1932.

Comparisonof

my Grenada

specimens with Chamberlin's descrip- tion of A. grenadanus

and

Pocock's description

and

figures of

Fig. 15.

—

AiitUlodcsimisvinccnti. Gonopod.

Odontopeltis vincenti leadsto the conclusion that but one species is involved.

The

living color of the animals is chestnut-brown with the keels anda triangular areaon eachsegmentyellow, thebase of thetriangle extending along the posterior margin contrary to the description of A. grenadanus, butPocock statedthat the color varies considerably, so that differences incolorpatternare of littleweight.

One

of thegonopods is

shown

infigure 15.

NO. 14 MILLIPEDS OF

WEST

INDIES

AND GUIANA —

^LOOMIS 31

BEATADESMUS,

n.gen.

Type.

—

Beatadesmitsutowani,n. sp.

Diagnosis.

—

Although no males have beenseen,thevalidityofthis genusseemswell substantiated

by

thecombinationofcharacters rep- resentedbytheverystrong teeth of the lateralandposteriormargins of thesegmentsnear themiddleof thebody,andthedifferentcolora- tion of the poriferousand nonporiferous segments.

Description.

— Body

withthe

dorsum

moderately convex, thesides parallel toaboutsegment16. Posteriorsubsegments smooth aboveor withone or

two

tinytubercles on the surface of thekeels.

Fig.16. Beatadesmusutowani. a,segments8 to11,dorsalview;h,segments17 to 20, dorsal view; c,first leg of segment8,female.

Head

wider than the body, the cardo of the mandibles especially prominent, long, subrectangular; antennae long and slender, joints 2to6inclusiveof uniformthickness.

Firstsegment semicircular,withan erect seta on each side of the middlecloseto the front margin.

Ensuing segments with a sharp, prominent tooth at the anterior corner ofeachkeel

from

segment2to segment16(fig. 16,a),behind whichthe tooth vanishes (fig. 16, h); on the middle segmentsthe tooth is larger

and

is produced outward and

backward

; posterior angles of the nonporiferous segments all stronglyproduced caudad, especially inthe

midbody

region;ontheporiferoussegmentsthethick- ened rim surroundingtheporeoccupies

much

of thelateralmarginof the keel andreplaces the produced angle. Posteriormargin of the segments witha large tooth

mesad

ofthe posteriorangle of each keel

and

usuallywith a

much

smaller tooth

mesad

of it;these teeth dis-

3

32

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 89 appearing on the last few segments. Poriferous segments differing incolor

from

theothers.

Anal valves subrectangular, flattened, with prominent margins.

Joint 3 of the legs

much

longer than anyof the otherjoints (fig.

16, c);sternanearthemiddle of thebody wider than the length of the thirdleg joint.

BEATADESMUS UTOWANI,

n.sp.

A number

of fragments of dead specimens and a single live but immature female (i8 segments) were found Januaryi8, 1932,under rocks on Beata Island, offthesouth coast of Haiti.

The name

given this animalassociates the island

where

it

was

found with the yacht Utowana, on whichthe

members

of the expeditionlived duringthree monthsofexplorationinthe

West

Indies.

Description.

—

Length of females probably about 25

mm,

width 3.5

mm

;malesshorterand

more

slender.

Body

with thesides parallel

from

neartheheadtoaboutsegment 16^;

dorsum

not strongly arched.

The

immature female

was

entirelywhiteinlife,but thedeadspeci-

mens

obviously retained

much

of the colorof thelivinganimals,and although none ^of these had the head or firstthree segments, allof theporiferoussegmentsarepresentandusuallyhaveanarrow

brown

area along the transverse sulcus on eachside of the middle, there- mainderof the surfacewhite;nonporiferoussegments with amedian lightareawhichisbroaderatthe posteriormargin thanin front,the remainder of the segment

brown

or with a narrow portion of the longitudinal margin of the keelswhite.

Anteriorhalf ofallsegments

brown

below, the

dorsum

with a white medianarea,widestatthe anteriormargin, extending

backward

and on

some

of the lastsegments joining with the white portion of the posterior subsegment. Last segment,valves, preanal scale, and legs entirely dark colored.

The

sternahave 30 to40 tiny, short hairs scattered overthesur- facebutwithslightlygreater densityin front thanon thebackhalf.

Othercharactershave been givenin thegenericdescription.

Tt/)^.—

U.S.N.M.

no. 1098.

BELONODESMUS THAXTERI

Chamberlin PlateI, fig.5

BelonodcsniHs thaxteri Chamberlin,Bull.Mus.Comp. Zool., vol. 62, pp.246-247, 1918.

This species is very abundant in the forests near Port-of-Spain, Trinidad, and probablyis

common

throughoutthe island. Its range

NO. 14 MILLIPEDS OF

WEST

INDIES

AND GUIANA

LOOMIS 33 alsoincludes

Tobago

Island,near the easternendofwhich,at

Man-of- War

Bay,it

was

collected inFebruary 1932.

Thisspecies

was

erroneously placedinthePolydesmidaeinstead of thepresent family, whereall its characters indicate that it belongs.

The

pores are not ^"nearthemarginof the keelsonthe dorsalside"

but are actuallyinthethickenedrimofthemargin,the obliqueeleva- tion of the keels allowing the pores to be plainly seen

from

above.

The

gonopods, one of which is

shown

in figure 17, are definitely chelodesmid.

Fig.17. Bclonodcsmu^thaxtcri. Gonopod.

In addition to the characters given in the original description, it

was

notedthatthereis a serrate-tubercular ridge onthe sideofeach segment

from

2 to 17 locatedashort distance above thebase of the legs.

The

sterna are highand wide withthelegs lateral to

them

;there isa distincttooth behindeach coxaljoint on thesegments

from

just in front of themiddle of the

body

toits rear end.

In the malethefifthjoint ofthe firstleg is produced distally into a lobe reaching almost to the claw of thelast joint; the succeeding four pairs oflegshavesimilar ventral lobes decreasinginsize. Ster-

num

between^thefourthlegswith

two

thin,high,transverse tubercles;

thatbetween thefifthlegswith

two

smallerconic tubercles;

and

that betweenthe sixthlegswith

two

highertubercles.

PRIODESMUS ACUS

Cook Plate2,fig.3

PriodesmiisacusCook, Proc.U.S. Nat. Mus.,vol. 18, pp.55,56, 1895.

A

mature femaleand anearlymature malewerecollectedabout 70 kilometers

from

Paramaribo,

Dutch

Guiana,beside the railway lead- ingtotheCable Stationonthe

Surinam

River,

March

3, 1932.

34

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 59