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



vrith spongy pubescence; lateral bead of the protfaorax only visible to- 

 ward base, wholly obliterated anteriorly 26 



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

 margin broadly angulate as usual, the angulatioa cuspidiforra; head 

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

 rounded 21 



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 hyporaera 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 auleriorly 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 punctuation 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 acgles of the prothoi'ax obsolete nearly as in Hahrolinus, broadly 

 roundtd, the sides subparaliel; body smaller and extremely slender; 

 antennae 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 one-half times as wide as long; 

 palpi nearly as in 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 impr'jssed, parallel and very 

 indistinct, the ocular obsolete and represented by a small rounded 

 punctiform depi'ession at the inner margin of the eyes; gular sutures 

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

 throughout to the base, where they are mi)st approximate but still dis- 

 tinctly separated; legs slender. Nearctic Atlantic regions. 



Nematolinas 



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

 to the base; second antennal joint but litile 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 mtne 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 grooves 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 LithocharodeB 



28 — 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- 



