300 NEW GENUS AND SPECIES OF ROACH 



PYCNOSCELOIDES new genus 



Genotype. — Pycnosceloides aporus new species. 



Adult female lacking organs of flight and retaining the imma- 

 ture form. Head as in Pycnoscelus, with wide interocular space 

 and flattened, weakly convex face. Dorsal surface smooth and 

 polished, except distal portion of abdomen which is roughened, 

 apparently by the adhesion of foreign particles. Pronotum 

 evenly convex, margin convex to latero-caudal angles which are 

 rather broadly rounded, caudal margin weakly convex, nearly 

 transverse, showing a slight angulation mesad. Mesonotum and 

 metanotum with caudal margins transverse mesad, laterad acute- 

 angulate produced caudad with apex sharply rounded. Cerci 

 reduced, short, stout, rounded distad, sublamellate, with joints 

 indicated only ventro-proximad. Supra-anal plate transverse. 

 Subgenital plate ample. Limbs moderately heavy. Cephalic 

 femora with ventro-cephalic margin supplied with a fringe of hairs, 

 lacking a distal spine. Other ventral femoral margins entirely 

 unarmed except ventro-caudal margin of caudal femora, which 

 bears a small, moderately stout median spine (and very rarely 

 a similar but smaller spine proximad). Dorsal genicular spine 

 of median and caudal femora reduced, small and moderately 

 stout. Pulvilli occupying entire ventral surfaces of four proximal 

 tarsal joints, as in Pycnoscelus. Tarsal claws elongate and deli- 

 cate, much surpassing the moderately well developed arolium. 

 Pycnosceloides aporus- new species 



2 From aTTopos = difficult to deal with. 



Type. — 9 ; Motzorongo, Vera Cruz, Mexico. February, 1892. 

 (L. Bruner.) [Hebard Collection, Type No. 495.] 



Size small for the subfamily, similar to that of Pycnoscelus surinamensis; 

 form not fully as broad as in females of that species lacking organs of flight. 

 Ocellar spots small and irregular. Dorsal surface and character and arma- 

 ment of limbs given in generic description. Distal abdominal segments with 

 caudal margins beaded, this minute but distinctly more decided than in Fycno- 

 scelus aurinamensis, latero-caudal angles of these segments briefly but sharply 

 acute-angulate produced. Supra-anal plate subquadrate; caudal margin 

 transvcr.se, weakly convex in each half, forming a minute median acute-angu- 

 late emargination, latero-caudal angles broadly rounded. Subgenital plate 

 broadly scoop-shaped, broadly concave at bases of cerci, produced and convex 

 mesad, extending as far caudad as the supra-anal plate. Ventro-cephalic mar- 

 gin of cephalic femora fringed with hairs, which are not decidedly longer proxi- 

 mad as in Pycnoscelus suritiamcnsis. 



