370 Trans. Acad. Sci. of St. Louis. 



-with spongy pubescence; lateral bead of the prothorax only visible to- 

 ward base, wholly obliterated anteriorly 26 



20 Prosternum shorter and less developed before the coxae, its posterior 



margin broadly augulate as usual, the angulation cuspidiforin; head 

 never more than feebly modified at the sidep, the basal angles 



rounded 31 



Prosternum larger before the coxae, arcuato-truncate behind under the 

 latter, its surface evenly and feebly convex throughout and wholly de- 

 void of carina at any part, the hypomera not inwardly dilated anteriorly; 

 head with an obtusely rounded, polished and irapunctate longitudinal 



line from the eyes posteriorly as in Hesperolinus 24 



21 — Prosternum not carinate, somewhat narrowed anteriorly by the in- 

 wardly dilated hypomera; basal joint of the hind tarsi longer than the 

 second; antennae stouter than usual and more compact toward tip, with 



the basal joint relatively much longer, the i)uuctuation flue 22 



Prosternum carinate along the middle, not narrowed anteriorly by an 

 inward development of the hypomera; basal joint of the hind tarsi 

 about equal in length to the second; antennae never more than moder- 

 ately stout 23 



22 — Anterior angles of the prothorax obsolete nearly as in Habrolinus, broadly 

 rounded, the sides subparallel; body smaller and extremely slender; 

 antenaae somewhat as in Habrolinus, the second joint slender and un- 

 usually elongate, longer than the next two combined, the third obtrape- 

 zoidal and slightly longer than wide, the outer joints very compact and 

 much thickened, the tenth two and on*!-half times as wide as long; 

 palpi nearly as iu Lithocharodes, the very oblique fourth joint extremely 

 slender, aciculate and two -thirds as long as the third; inner pair of 

 frontal grooves short, broadly and feebly impressed, parallel and very 

 indistinct, the ocular obsolete and represented by a small rounded 

 punctiforra depression at the inner margin of the eyes; gular sutures 

 very flue, feebly, evenly arcuate, gradually and feebly converging 

 throughout to the base, where they are most approximate but still dis- 

 tinctly separated; legs slender. Nearctic Athmtic regions. 



Nematoliuas 

 Anterior angles of the prothorax raiher distinct, the sides converging thence 

 to the base; second anteunal joint but little longer than the third, both 

 distinctly elongated, the third equaling the fourth and fifth combined; 

 third palpal joint only moderately elongate, the fourth small, slender, 

 acutely conical, oblique and rather more than half as long as the third; 

 gular sutures fine, approaching each other to the middle or before the 

 latter, and thence parallel and extremely approximate to the base; eyes 

 moderate; median pair of frontal arooves fine, rather short and par- 

 allel, the oblique ocular subobsolete; neck but little more than a fourth 

 as wide as the head: body only moderately slender. Tropical and Sub- 

 tropical Atlantic North and South America Lithocharodes 



23 Body larger as a rule than in the two preceding genera, the head well 



developed, the third joint of the maxillary palpi elongate, enlarged dis- 

 tally, the fourth small, generally about one-half as long as the third, 

 slender, conical and oblique; gular sutures arcuate, becoming ex- 

 tremely approximate from rather before the middle to the base; sculp- 



