AMARIN^E 279 



Oblong-suboval, larger and stouter than the preceding, one of the lar- 

 gest species of this section, piceous-black, with black elytra, pol- 

 ished, without trace of metallic lustre, the elytra faintly alutaceous 

 in the female; under surface piceous; legs very obscure, the femora 

 paler, rufous; head and antennae nearly as in the preceding, the 

 prothorax also nearly similar, but scarcely a third wider than long 

 and with more arcuate sides, the apex similar, the basal angles not 

 rounded and barely more than right; transverse impressions obso- 

 lete; punctures of the foveal regions stronger, closer and more nu- 

 merous, the foveae nearly similar but larger and more broadly im- 

 pressed; elytra subsimilar in general outline, equal in width to the 

 prothorax, with feebly arcuate sides; striae a little coarser and deeply 

 groove-like, wholly without evident punctures, the scutellar mod- 

 erate, entire, broadly free at tip; lateral series similarly uninterrup- 

 ted; intervals broadly convex, more shining than in the female of 

 suborned. Length (9) 6.9 mm.; width 3.1 mm. Colorado (Boul- 

 der Co.) hospes n. sp. 



7 Body rufous to flavo-rufous when mature 8 



Body piceous to black, the head and prothorax, however, usually very 

 slightly paler or less black than the elytra 16 



8 Coloration of the upper surface uniform 9 



Coloration bipartite, the elytra more obscure than the head and pro- 

 thorax 13 



9 Head relatively large, fully three-fifths as wide as the prothorax. 

 Form oblong-suboval, rather elongate, convex, polished through- 

 out and pale rufo-testaceous; femora brighter rufous than the tibiae 

 and tarsi; head fully as long as wide, with prominent eyes, the stri- 

 oles short, oblique; antennae ferruginous, distinctly longer than the 

 thoracic width; prothorax as elongate as in the preceding section 

 but with the apex very feebly sinuate, with broadly blunt angles, 

 a third wider than long; sides broadly arcuate, converging ante- 

 riorly, the basal angles slightly obtuse and blunt; impressions obso- 

 lete, the stria fine as usual; punctures of the foveal. regions rather 

 few in number but strong; foveae broadly impressed, the inner briefly 

 sublinear, the outer rounded and punctiform; elytra three-sevenths 

 longer than wide, just visibly wider than the prothorax, obtusely 

 ogival in apical third, the sides feebly arcuate; striae strong and im- 

 pressed, with very distinct close-set punctures, the scutellar rather 

 short, punctate, oblique and free; lateral series narrowly and indef- 

 initely interrupted; intervals distinctly though not strongly convex; 

 tarsi slender. Length (9) 5-8 mm.; width 2.5 mm. Delaware. 



lucina n. sp. 



Head relatively much smaller, never more than slightly exceeding half 

 the thoracic width 10 



10 Prothorax more elongate, nearly as in the preceding and much less 

 than one-half wider than long. Pale rufo-testaceous throughout, 

 the femora rather more flavate; lustre very shining, the elytra not 

 very distinctly alutaceous in the female; head slightly more than 

 half as wide as the prothorax, with prominent eyes and long slender 

 flavate antennae; prothorax barely two-fifths wider than long, the 



