52 SMITHSONIAN MISCELLANEOUS COLLECTIONS

The

outer lobes of thekeels, tojust in front of the middleof the body, each have a single seta in the margin; the outer lobes of the keels of theremaining segments each have

two

setae in the margin.

Posterior margin of the keels with the incisions deeper than those of the frontmarginand withtheouterincision

more

remote

from

the base of the keel than that of the front margin.

On

the posterior margin the lobe adjacent to the one at the outer corner contains a conic,bristle-tipped tubercle. Closetothebase of each carinaonseg-

ment

2isabristle-tippedtubercle;similar tubercles arefound onthe

Fig. 25.

—

lomoideshispidus. a,headandfirst2segments, ventralview;b,eighth segment, posteriorview; c,gonopod, meso-posterior view.

carinae of segments ₃ and4, but increasingly farther

removed from

thebase of thecarinae,

and

on segments6,8, 11,and 14 the tubercles arenear themiddleof thecarinae,poriferous segmentswithout such tubercles. Posteriorviewof segment 8

shown

infigure25,h.

Penultimate segment with the tuberclesreduced in size, especially those of the outer rows, thelasttubercleineach inner

row

projecting a little

way

behind the back margin.

Last segment with the

two

apical marginal tubercles very close together.

Gonopods

as

shown

in figure 25, c.

Type.—

U.S.

'^M.

^no. 1104.

NO. 14 MILLIPEDS OF

WEST

INDIES

AND GUIANA — ^LOOMIS

53

lOMOIDES GLABRA,

n.sp.

Plate3,fig-5

A

^male (type)

and

a female

were

collected atChristoph's Citadel,

Cape

Haitien, Haiti,

March

27, 1932.

Diagnosis.

—

^{This species}

may

be instantly distinguished

from

/.

hispidus by the complete lack of hairs on the

dorsum

or along the outermarginsof thesegments.

The

tubercles of segment i arerela- tivelylargerand

more

distinct. In addition the following differences occur

The body

issmaller

and

narrower,themalebeing5.5

mm

longand 1.2

mm

broad, thefemale7

mm

longand1.5

mm

broad.

The

incisions of the keels arenarrower

and

dirt-filledinbothspecimens.

Fig.26.—lomoidesglabra. Gonopod.

Segment

i has the anterior margin

more

definitely rounded al-

though still

somewhat

subhexagonal.

Of

the anterior

row

of four tubercles, the inner

two

aredoublethesize of theouter ones.

There

are butfour tuberclesinthe posteriorrow,the outeronesof the

same

size as the corresponding ones in front but the inner

two

half the size of theouter, hence contrasting very strikingly in size with the pair in front.

The

gonopods

show

further differences, as seen in figure 26.

Tv/'c.—U.S.N.

M.

no. 1105.

PSOCHODESMUS

Cook PsochodcsmiisCook, Brandtia,p.25, 1896.

XerodesmusChamberlin, Proc. CaliforniaAcad. Sci.,vol. 12, p. 403, 1923.

TidopierusChamberlin, Zoologica,

New

YorkZool. Soc,vol.3, no. 21,p. 420, 1923.

DominicodesmiisChamberlin, Proc.Biol.Soc.Washington,vol. 36,p.189, 1923.

Afterexamininga

number

ofspecimensof

Psochodesmus

crescen- tis

Cook from

thetype locality inFlorida,

and

comparing

them

with descriptions,illustrations,orspecimensrepresenting theabovegenera,

it is apparentthat all these genera are

synonyms

of Psochodesmus.

Specimensof

Dominicodesmus

geophilus

from many

Haitianlocalities

54

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 89 are obviouslycongeneric withP. crcscoitis, andin comparison with theparatype specimens of Trcscolohusgramdofrons

Chamberhn

no specificdifferences whatever werediscovered.

As

the description of this latter species outranks

Domini

codesmus geopkilus in time of publication, the Haitian species must

now

stand as

Psochodesmus

gramdofrons (Chamberlin).

The

following generic notes were

made from

specimensoftheFloridaandHaitian species

:

Head

with the granular area of the vertex traversed by a dis- tinct median furrow. First segment

somewhat

flattened,

much

less strongly convex than the next segment and with the margin and lateral angles notably higher than the keels of that segment. Seg- ments2, 3, and

4

slightlyshorter atthemiddle thansegment 5.

As

viewed

from

the side the keels of the segments do notreach below the ventralthirdof the body. Analvalvesdistinctly convexandwith thin,raised margins. Sternanarrowerthan thediameterof the basal jointof the leg

on

eithersideand with adefinitemediangroove.

Inasmuch

asthe original description of P. crescentisis extremely brief, the following characterization has been prepared in order to placeitona comparablebasiswiththe otherspecies.

PSOCHODESMUS CRESCENTIS

Cook PsochodesmuscrescentisCook, Brandtia,p.25, 1896.

Numerous

specimens with 19 segments were collected between Crescent City and Palatka, Florida,

May

16, 1927, by O. F. Cook.

One

20-segmented male and three females were collected at

Vero

Beach, Florida, April 22, 1933, by

H.

F. Loomis. Other specimens

Fig. 27.

—

Psochodesmus crescentis. a, first segment, dorsal view; b, keels of segments9and10,dorsal view.

have beencollected at theUnited States Plant Introduction Garden, Coconut Grove, Florida, by O. F.

Cook and H.

F. Loomis.

First segment withthe scalloped anteriormarginbroadly rounded, thescallops shortandbroad, notseparated byincisions (fig. 27,a)

;

surface with

numerous

small indistinct granules and

two

transverse rowsofroundtubercles, fourin the anterior

row

andsix in the pos- teriorrow.

Second segment with the lateral margin of each keel but little longer than the margins of the keels of the next

two

segments, the marginallobes not conspicuously largerthanonthose segments.

All segments

from

the second to the penultimate inclusive with four longitudinalrows of largeroundedtubercles, three tubercles of subequal size in each

row

; surface elsewhere covered with rather indefinite granules, those in the interval between the inner rows of tubercles in

two

longitudinal rows.

Nonporiferous segmentsin front of segment 15withthree lateral lobeson eachkeel,segments 16-19,withthe keels 4-lobed; segment5 withasinglelobein front of theporeprocess, allother pore-bearing segments with

two

lobesinfront of the process,whichprojects

from

the posterior corner of thekeel (fig. 27, b). Segments 2to 18with

two

lobesonthe posterior margin laterad of the outer

row

of large dorsal tubercles,theouter lobe thelargest andslightly elevated.

Lastsegment witha long tubercle oneach sideof themiddle bent caudad and slightlyexceeding theposteriormargin.

Femaleswith scarcelyanycrestonthe ventralsideof the third seg-

ment

immediately behind thesecondpairo-flegs.

From

the descriptionandthedrawingsof P.sequcns (Chamberlin)

it is evidentthat itis closely relatedtoP. crcsccntis but isof larger size;the basal joints of thegonopods of the 19- and 20-segmented specimens ofP. crescentis are broader than long, but in P. sequens the basal jointsare distinctly longer thanbroad; apical joint of the gonopods notshowinginthe

immature

Florida specimens

and

broken inthe matureone.

Specimens of P. f/raiiulofro)is (Chamberlin) have been found in several localities in Haiti, anda description has been prepared

from

them, which allows comparison with P. crescentis.

PSOCHODESMUS GRANULOFRONS

(Chamberlin)

Trcscolobttsgramilojrons Chamberlin, Bull. Mus. Comp. Zoo!., vol. 62, p.221, 1918.

Dominicodesinus gcopJiUiisChamberlin, Proc. Biol. See. Washington, vol. 36, p. 189,1923-

Examination of the paratypes of T. granulofrons

showed

it to be a species of

Psochodesmus

and, furthermore, in comparison with specimens of D. geophilus it

was

obvious that but a single species

was

involved.

The

type of T. granulofrons seems to be no longer in the

Museum

of Comparative Zoology, Cambridge, Mass.^; hence theexamination had to be from the paratypematerial.

56

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 89