64 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 Last segment fully exposed from above ; the dorsum with two

64

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 89

NO. 14 MILLIPEDS OF

WEST

INDIES

AND GUIANA

LOOMIS 65

INODESMUS PEDUNCULARIS,

n. sp.

Plate 4,figs. 5and6

Over

a score of female specimens were found on the under side ofa log nearParamaribo,

Dutch

Guiana,

March

i,1932.

Description.

—

Length7

mm,

width .6

mm.

Livinganimals whiteand remainingsoinalcohol.

Head

exposed

from

above; densely beset with short hairsto the clypealregion;vertexwithamedian furrow;frontcrossedbyadeep transverse furrow just below the antennal sockets; clypeal region elevated,smooth, withfour longsetaenearbaseand abouteightothers along themargin; antennae separated by a distance equalto the di- ameterof oneof thesockets.

Firstsegment narrower than the head or ensuing segments, oval in shape.

Ensuing segments without any definite projecting lateral carinae, these being indicated by ratherprominentshoulders on the anterior segmentswhich

become

lessobvioustowardtheback endof the body.

Dorsal surface of the segments finely granular andbeset with long, erect,but flexuoushairs.

Second segment extendingfartherventrad thananyothersegment thesides in frontproduced forward andcovering the posteriorlateral marginof segmenti. There isadefinitelyproduced,rounded promi- nenceatthe posterior corner, opposite thelaterallimitof segment3.

Segment

5witha definitelypedunculate poreoneachsideclose to the anterior marginof the subsegment.

On

the othersegments the pores areonsmallerpeduncles

and

arenearthemiddleof the segments.

Lastsegment with a deflexed

mucro

surpassing the valves except

when

they are open.

Other characters given by Silvestri in the generic description of Lasiodesmusare exhibitedbythisanimal.

Type.—

U.S.

^M.

^no.

mo.

After comparing the present species,

from

a generic standpoint, with Silvestri's description of Lasiodesmus and withthe briefchar- acterization of Inodesmiis Cook," there appears to beno reason for maintainingSilvestri'sgenus. Chamberlin'sassumptionthatLasiodes-

mus

belongs to the Strongylosomidae^'" is erroneous.

The

question of the distinctness of

Inodesmus

jamaiccusis

Cook

and/. caraibicus (Silvestri) cannot be decided untilcomparison is

made

of thetypes or of specimens undoubtedly similar to the types.

Brandtia,p.25, 1896.

"Bull. Mus.Comp.Zool., vol. 62,p.246, 1918.

66

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 89

From

the descriptions of /. jamaicensisand /. caraibicus the fol- lowinginferences are possible: /. peduncularisdiffers

from

both in havingstalked pores, thefirstofwhichisadjacenttothefrontmargin

Fig. 2i~-

—

Inodcsiiuispeduncularis. First 5 segments, lateral view.

of segment 5^{; it} differs further

from

/. caraibicus,as

shown

in Sil- vestri's illustration, intheshapeof thesecondsegment,whichoverlaps the posterior-lateral part of the first segment and which also has a producedlobe ortubercleon theposterior angle (fig. 32).

Family

CYRTODESMIDAE

CYLIOCYRTUS OCREATUS,

n. sp.

Plate3,fig.7

About

15 specimenswere collected in the

Maracas

Valley and the

Arena

Forest, Trinidad,February 13, 1932.

Diagnosis.

—

^{Apparentlydiffering}

from

C. asper (Peters) inhaving the first segment entirely concealed

from

the side by the expanded sidesof segment 2^; andthere are

no

large tubercles onthe

dorsum

of the segments as

shown

in Cook's drawing." It is possible that the radiatinglinesseenonthelaterallobesofsegment2in thisspecies alsoare present in C. asper, in which case they area generic char- acter; otherwise they constitute aspecific difference.

Description.

—

Length 10

mm,

width 2

mm.

Living aniinals dull black; the anterior subsegments black pos- teriorly, white anteriorly, the dividing line very definite, biarcuate.

Head

blacktobetweenthe antennae, which, withthe anteriorpart of the head, are white. Legs, anal valves, andpreanalscale also white.

Head

withthe vertex eroded-granular, not hispid;

two

ridgesabove theantennaeand most prominentnear

them

;vertexand front joined at the

same

level; antennae strongly geniculate at the fourth joint

(%.

^33,a)-

"Proc. U.S. Nat. Mus.,vol.21.pp.451-468, 1898.

NO. 14 MILLIPEDS OF

WEST

INDIES

AND GUIANA

LOOMIS 67 First segmentsemicircularor

somewhat

crescentic; with the front margintransverse andsHghtly emarginate, the medianthird low and simple, theouter thirdoneach sideoccupiedbythree elevatedlobes, theouter of whichis twice asbroad as the

two

subequal inner ones combined; disk broadly depressed along the middle, finely erose- granularandhispid,each side

somewhat

inflated andcoarselygranu-

lar,erose,andhispid but with

some

of thesetaelonger than thoseon the middle of thedisk.

Second segment completely concealing thefirst segment

from

the side;themedianportion of the

dorsum

depressed, thesides

somewhat

inflated; sculpturing of the

dorsum

similar to that of segment i

expandedlaterallobeswiththesurface coarsely granular-erose,hispid, the granulations separated into definite triangular sections

by

de-

Fig.2,2,.

—

Cyliocyrhisocrcatits. a,antenna; b,gonopods.

pressedlinesradiating

from

a central point of the lobeand extending tothe raised rim ofthe anterior andlateralmargins of the lobeand terminatinginslightincisionsof the rim,whichgive itafaintly scal- loped appearance.

Ensuing segmentscoarsely granular-eroseandstrongly hispid with short and long setae intermixed, the entire surface usually with a moderate incrustation of dirt which hides the pores. There are no largetuberclespresentonthe

dorsum

as

shown

inCook's illustration of C. asper.

The

outer margin of the keels, following the second segment, is simple

and

sharply rounded, becoming

more

broadly rounded on the middle segments, where it is indistinctly 2-lobed, and on the posteriorsegments it finallybecomesindistinctly3-lobed.

On

theanteriorsubsegments the darkposteriorportion isuniformly pitted, the surface including the pits very finely granulated; white anterior portion of the subsegment minutely honeycombed.

68

SMITHSONIAN MISCELLANEOUS

COLLECTIONS VOL. 89