Casey — A Revision of the American Paederini. 69 
sensitive spot in Scofonomus, of the Dolicaones. The widely 
dilated anterior tarsi are densely clothed beneath with large 
whitish pads, composed of peculiar flattened and multinucle- 
ated submembranous hairs. The gular sutures are invari- 
ably separated but vary in form and direction, affording good 
generic characters. The nineteen genera described below 
from material in my cabinet are‘divisible into at least four dis- 
tinct groups represented by Lathrobium, Lathrotaxis, Domene 
and Dacnochilus, and are about equally diffused through the 
old and new continents :— 2 
Labrum broadly rounded, edentate, having a broad and gradually formed 
angulate emargination, the angle at the bottom usually with a minute 
denticle as in some Paederi; integuments densely sculptured and sub- 
opaque anteriorly. Body rather slender, parallel and unusually convex, 
moderately large in size, the head well developed, oval, subcircularly 
rounded at base, the eyes moderately small, anterior; labrum short and 
transverse; maxillary palpi moderately long and thick, the third joint 
obconic, the fourth narrow, conical and acute; gular sutures arcuately 
converging for a short distance, then becoming Straight, parallel and 
approximate to the base; antennae moderately long, thick, the joints 
rounded in outline toward base; neck about athird as wide as the head; 
prosternum moderately long before the coxae, carinate posteriorly; 
prothorax elongate-oval, the angles obliterated, the head and pronotum 
densely, confluently sculptured; elytra short, small, as wide as the 
prothorax and shorter, apparently subconnate, the sides broadly round- 
ing to the base, the basal angles obliterated and the hind wings proba- 
bly vestigial, the sculpture coarsely, confusedly punctured and shining; 
abdomen minutely, densely punctulate; legs rather long and slender, 
the hind tarsi slender, filiform, nearly as in Linolathra, the two basal 
joints each notably elongate, equal and slightly shorter than the fifth. 
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Labrum bilobed and edentate; integuments more or less strongly and 
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Labrum broadly rounded, dentate or edentate, having an abruptly formed 
deep angulate emargination at the middle; integuments subglabrous, 
subimpunctate and highly polished... ..eseee sees sevecvccecsceessesld 
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Elytra with a longitudinal fold on the deflexed fianks parallel with the side 
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8 — The normal faceted eye wholly obsolete; species large, parallel; head 
large, broadly arcuato-truncate at base, the labrum broadly lobed, the 
lobes narrowly rounded laterally, the broad median angulation not 
attaining the base; maxillary palpi long and slender, the fourth joint 
evenly, conically pointed; gular sutures broadly, feebly arcuate, widely 
separated anteriorly but gradually convergent to the base, at and be- 
fore which they became virtually confluent; eye-spots obliquely fusi- 
