Casey — A Revision of the American Paederini. 25 



gin, the corneous part strongly, circularly impressed at base; prothorax 

 narrowed anteriorly from near the middle, elongate, convex; prester- 

 num much longer than usual before the coxae; gular sutures, elytra and 

 abdomen nearly as in Hesperobium ; legs long and very slender, very 

 sparsely setulose, the basal joint of the hind tarsi as long as the next 

 two combined and very much longer than the fifth ; integuments through- 

 out highly polished. Southeastern States of America Lissobiops 



7 — Labrum edentate; eyes situated near the middle of the head, the sides 



behind them rapidly narrowed and evenly arcuate to the neck which is 



relatively narrower than in Hesperobium 8 



Labrum bidentate; body much smaller in size and generally very slender. ^ 



8 — Body large and stout, the abdomen ioflated, arcuate at the sides and 



wider than the elytra; head and pronotum in the type minutely sparsely 

 and very inconspicuously punctate, very dull and wholly lustreless be- 

 cause of extremely minute deep closely crowded punctules, each of 

 which is shining at the bottom; elytra polished, sculptureless, with 

 coarse impressed simple punctures irregularly disposed and moderately 

 close-set; abdomen finely, rather sparsely punctulate, rather strongly 

 micro -reticulate but shining; head large and greatly developed; lab- 

 rum short, truncate, with a very minute and abruptly formed median 

 notch, nearly as deep as wide and broadly rounded at the bottom, with 

 its sides straight and but slightly diverging; mandibles very large and 

 stouter than in Hesperobium, bidentate within, the inner edge thence to 

 the base nude and without trace of the membranous fimbria of Lis- 

 sobiops, the left mandible abruptly bent beyond the teeth, the right more 

 evenly arcuate; eyes moderate, just before the middle, the two post- 

 ocular setigerous foveae distinct, the surface between them elevated,, 

 subcarinate and laterally prominent; neck stout and but little narrower 

 than the prothorax and only slightly more than half as wide as the head; 

 basal joint of the antennae much elongated, longer than the width of 

 the prothorax; membranous lobes of the ligula small, rounded; men- 

 tum moderate, coriaceous in apical half, not impressed basally, the 

 apical margin arcuate; maxillary palpi long and extremely slender, the 

 third joint six or seven times as long as wide, with perfectly rectilinear 

 sides; gular sutures deeply impressed, very approximate slightly behind 

 the middle; prothorax relatively small, oblong, parallel; prosternum 

 well developed before the coxae, transversely impressed posteriorly; 

 elytra large, p irallel, wider than long ; abdominal border broad, inclined, 

 the segments impressed at base toward the middle, the third and 

 fourth with a median longitudinal carina crossing the impression; legs 

 long, rather slender, polished and sparsely setulose, the anterior tibiae 

 densely clothed with stiff fulvous hairs in apical half; posterior tarsi 

 long, rather stout, the basal joint almost as long as the next three 

 combined and very much longer than the fifth. Central and South 



America * Pycnocrypta 



Body moderate in size and convexity, fusiform; punctures throughout sim- 

 ple and small in size; head relatively small in size, the eyps well 

 developed, prominent, slightly behind the middle of the length, the 

 frontal part of the head before them greatly reduced in width; post- 

 ocular foveolae small, the surface between them feebly tumid and not 



