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 Dacnodiihcs, and are about equally diffused through the 

 old and new continents : — 



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 a third 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. 

 Europe *Domene 



Labrum bilobed and edentate; integuments more or less strongly and 

 sparsely punctate 2 



Labrum broadly rounded, dentate or edentate, having an abruptly formed 

 deep angulate emargination at the middle; integuments subglabrous, 

 subimpunctate and highly polished 23 



2 — Elytra without a lateral fold 3 



Elytra with a longitudinal fold on the deflexed flanks parallel with the side 

 margin 16 



3 — 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- 



