()6() NKW isPKCIES OF FRESH-WATEH CKAHS IJATIIUUN. 



Fiimily TltlCIlODACTYI.I D.K. 



Trichodactylus quinqiiedeiitatus. 

 ( I'l. i,\x\ii, Eii;. 7.) 



Carapace vory comcx l()ii,i;i(u(liiiiill> , sli^lilly (onvcx transversely. 

 Surfiico sniootli, sliiniiij;', ])iiiH't;tt(>, the punctie irrei^ular iu size and 

 numerous. There is au ^j-sliaped (h'pression iu the eeuterof the cara- 

 pace. Frout uarrower than iu pniicioius, consisting" of two broad h)bes 

 nu)re i)ronoun(HMl than in specinu'us of puncfdfu.s of e([nal size. Exter- 

 nal orbital auj^le obtuse. Lateral margiu strongly arcuate, armed with 

 five teeth, besides the orbital, the first three sharp and spiniforin, the 

 last two blunt. Carai)ace widest at the fourth tooth. Frontal, orbital 

 and lateral margins ridged ami smooth. Outer margin of merus of 

 luaxilliped ridged and more strongly i)roduced at its anterior angle 

 than iu pinwfatus. Abdomen of female coNi'riug the sternum; termi 

 ual segnu'ut broadly triangidar, rounded at the ti]). ('lielii)eds in 

 female unequal, ])unctate; merus triangular, upix'r margin acute, with 

 a tooth at the distal end; lower surface with a small sliaip S])ine on 

 the outer ami the inner margin, and a blunt i)roi(H;tion at tluu'xtreniity 

 of the outer margin; carpus with a spine on the inner margin. Hands 

 convex beneath, almost straight above: smaller haml about two thirds 

 as deep as larger; lingers in contact in both hands. Ambulatory legs 

 very slender; uun-al joints not dilated. Ambulatory legs, fingers, and 

 upper portion of hand and carpus, covered with a close velvety 

 pubescence. 



Lengtli. 11>; width, L'2 millimeters. 



Found in a. ditch, ainujst dry, near the Escondido IMver, 50 miles 

 from IJluelields, Nicaragua, by Charles AV. UichnH)n<L August lo, 1S!)L>; 

 one fenmle (1 772()). 



T. qui nqiicdcntdi i(s ciiw )»«' distinguished from other species by the 

 uumber of lateral teeth. 



EXI'LANATION OF l'LATi:s. 

 iFrom (lr;nviii,<;-.s l)y Mr. A. 11. H.vi.dwjx.) 



l*i..\ri; i.xxiii. 

 I'ncikJoIIkIi)!!!!^^ Jtini/i, ,< , X U. 



I'l.AlK I, XXIV. 



Fi(i. 1. /'./o/()/i, live so<;ineuts of male iibdoiiKMi. X 1;'. 



1'. I'. Joui/i, lirst ubdoiiiiual ap))('iidtigo, outer side, X 3^. 



;'.. /'. /'oi/^i, external maxilliped, X l;'. 



I. /'. (Iiiijini, carapace of J , X l-. 



5. /'. diKjcui, lirst abdominal appeiidajre, otitei' side, X t. 



('). /'. tcrrculris, earapaee of J, X 1:'. 



7. /'. IvrrcHlris, lirst ubtlominal a])peiida_iie, oiiti-r side, x 3,!, 



?<. /'. nrlicdHn^ larjje hand of ^. X l:-!. 



it. /'. rcrticdlis, lirst abdominal aiijtendago, wpi)i'r .side, X 2U 



10. /'. ('('/"m/>/«««.s, <arai):u'i" of small 9i X !:•!• 



