Casey — A Revision of the American Paederini. 57 
thorax, oblong, the neck very wide, four-fifths as wide as the 
head; labrum very short, transversely truncate, with a very small 
’ rounded median sinus, at each side of which there is a small and 
abruptly formed tooth; antennae short, rather slender; gular sutures 
evenly arcuate, moderately separated, most approximate at the middle; 
maxillary palpi with the third joint much longer than the second, 
strongly obconical and compressed; prothorax oblong, the angles 
distinct; prosternum more developed before the coxae than in the 
preceding genus; elytra well developed, as long as the prothorax or 
longer, the basal angles distinct; hind wings probably well developed; 
abdominal segments not impressed at base; legs slender, the hind tarsi 
filiform, the joints proportioned nearly as in the preceding; anterior 
tarsi, rather feebly dilated. Europe.......... esseeeese-*Leptobium 
3— Body very small in size, slender, parallel, convex, polished, distinctly, 
evenly and more closely punctured, the abdomen relatively finely, very 
sparsely punctulate; pubescence entirely inconspicuous; head about 
as wide as the prothorax, somewhat pyriform; labrumas in Leptobium, 
bidentate, the teeth longer and more aciculate; gular sutures well 
separated, converging to about the middle, thence subparallel to the 
base; maxillary palpi with the third joint much longer than the second, 
subcylindric, rapidly narrowed at base, sparsely setulose; antennae 
short, one-half longer than the head, slender basally, rapidly incrassate 
distally; neck narrower, three-fifths as wide as the head; prothorax 
suboval, widest anteriorly, with a narrow median smooth line; proster- 
num well developed before the coxae; elytra extremely short as in 
Dolicaon, with rounded basal angles, the hind wings undoubtedly 
obsolete or vestigial; abdominal segments not impressed basally; 
legs slender, the hind tarsi nearly as in Leptobium, the anterior feebly 
dilated. FEUTOpe.....cccesccccccescccces Kieeeucwe + --s---*Seetonomus 
Dolicaon Lap., is founded upon the comparatively gigantic 
lathrobioides Lap., of the regions about Cape Town. Among 
some 450 species of Coleoptera which I took in that vicinity, 
there was only this one Paederid, —the largest species of the 
tribe known to me, —as though the entire paederoid energy 
of the country had been concentrated in this single species. 
The diagnosis of Leptobiwm (n. gen.) given above, is taken 
from the biguttulum, of Lacordaire, and that of Scotonomus 
Fauv., from the raymondi, of Fauvel. The species, although 
very few in number, display in Dolicaon and Scotonomus the 
greatest disparity in size observable within any of the sub- 
tribes of Paederini. In the formation of the very short 
elytra and probable absence of hind wings, these two genera 
are identical and wholly different from Leptobium, the 
European species requiring a new generic name, since both 
