148 Rowland M. Shelley 



subparallel for most of lengths, arising distad on prefemur; prefemoral 

 process long, expanded and laminate, elaborately ornamented, with strong 

 medial spine distal to midlength and numerous hairs on lateral surface 

 and inner distal and apical margins; acropodite acicular, passing through 

 essentially a single vertical plane, sublinear for most of length, lying 

 over medial face of prefemoral process; cyphopod valves flattened ventrad, 

 without lobes, projections, or cavities. 



Description — A genus of moderate-size to large chonaphine 

 Xystodesminae with the following characteristics: 



Body composed of head and 20 segments in both sexes. Head of 

 normal appearance, smooth. Epicranial suture sharp, distinct. Antennae 

 relatively short and broad, with 4 conical, terminal sensory cones; no 

 other sensory structures apparent. Facial setae with epicranial, sub- 

 antennal, frontal, clypeal, and labral series; interantennal and genal 

 absent. 



Terga smooth, polished; strictures broad, distinct. Collum large 

 and broad, terminating at same level as succeeding tergite. Paranota 

 present on all tergites, becoming distinctly shorter around midbody 

 and progressively more so caudad, moderately declined, continuing 

 slope of dorsum. Peritremata distinct; ozopores opening sublaterad. 



Caudal segments normal for family. 



Sides of metazonites smooth, polished, with at most only shallow 

 impressions. Pregonopodal sterna of males glabrous; 4th with two 

 long, diverging projections, overhanging adjacent coxae; 5th with two 

 short lobes between 4th legs, flattened between 5th; 6th sternum strongly 

 depressed between both leg pairs. Postonopodal sterna glabrous, flat, 

 and unmodified, with only shallow transverse grooves originating be- 

 tween leg pairs. Coxae unmodified; prefemora with broadly rounded, 

 ventrodistal lobes, becoming progressively smaller caudad. 



Gonopodal aperture large, subtrapezoidal, with broad caudal 

 extension between 9th legs. Gonopods in situ with telopodites in parallel 

 arrangement. Coxae with 2-5 macrosetae, connected to each other by 

 narrow sternal band, latter with lobes subtending coxae. Telopodal 

 elements subparallel for most of lengths, arising distad on prefemur; 

 latter relatively broad; prefemoral process large, expanded and laminate, 

 elaborately ornamented, with broad, cupulate, irregularly serrate basal 

 flange, bending abruptly dorsad and expanding into lateral and another 

 medial flanges, former marginally smooth, narrowing or expanding 

 distad, with or without thickened margin, latter cupulate basally, curling 

 around acropodite in some males, marginally irregular and with strong 

 distal spine, stem of process narrowing then expanding greatly distal 

 to flanges to subacuminate tip on inner, distal corner, inner margin 

 and lateral surface hirsute, becoming progressively denser distad, distal 



