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; proster- 
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; integumentsthrough- | 
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 Hesperobdiwim...s-.seseescesesescsesceeee 8 
Labrum bidentate; body much smaller in size and generally very slender. 9 
8 — Body large and stout, the abdomen inflated, 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; Jab- 
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 asthe 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, parallel, 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 
AMETICA.. 0 see ee reece cence cece scenes sees cesses sees soceee™® Pycnocrypta 
Body moderate in size and convexity, fusiform; punctures throughout sim- 
ple and small in size; head relatively small in size, the eyes 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 
