AMERICAN COLEOPTERA. 23 



".—The prothorax varies greatly in size and form, being usually larger in 

 9 than % : the elytra sometimes much less dilated beliind. These 

 differences account for the names by whicli in my inexi)erience I 

 distinguished two nominal species. 



Group 2. — Erofes. 



In tliis oroup the front i.s short, gibbon^s, sometimes triin.sversely 

 margined, the beak is wanting and the mouth deflesed ; the last jiiint 

 of the maxillary palpi is longer than the preceding, acute at tip. 



The antenna? are moderately c-ompressed. with the second joint usually 

 at least one-half as long as the third, which is not longer than the 

 foui-th. Prothorax carinate, divided into cells or feebly channeled ; 

 spiracle not tubular, depressed. Elytra reticidate. costate and cancel- 

 late, or with ribs scarcely elevated and interstices with single small 

 quadrate depressions, never widely dilated behind. Front coxa' rather 

 narrowly separated. 



Prothorax strongly carinate, sides divided by an oblic^ue ridge fr<iiii tbr liiud 

 angles LOPHEROS n. g. 



Prothorax many celled, sides divided by a .strong transverse ridge EROS. 



Prothorax not carinate, feeldy channeled behind, sides not diviilcd by transverse 

 ridge .• PLATEROS. 



i.oi>ii»:rok n. g. 



Li/cus fraftn-HHs differs s(j remarkably from the other Eros-like forms 

 in our fauna, that I have felt disjio-sed to .separate it as a distinct genus. 

 not however, without perceiving that a more careful study of foreign 

 forms may lead to the suppre.s.sion of this with Pfateros. and some 

 other dismemberments suggested by 3Ir. Waterhouse into Eros. 



The eyes are small and lateral, widely separated in both sexes, the 

 head transversely impressed between the eyes, front channeled, convex. 

 Antennae moderately serrate, first joint triangular, equal to the third, 

 second triangular, wider than long, one-third the length of the third. 

 4 — 10 very gradually longer and narrower, eleventh one-third longer 

 than tenth. Prothorax wider than long, narrowed in front, strongly 

 carinate nearly to the base, disc deeply concave, sides strongly reflexed, 

 oblique, sinuate, hind angles prolonged outward, with an oblique carinate, 

 reaching neither the angle nor the median ridge. Sciitel elongate, nearly 

 parallel, emarginate behind. Elytra gradually and slightly widened 

 behind, with suture, margin and four discoidal strongly elevated cost;>3, 

 interspaces goifred or waffled, with doidjle rows of quadrate cells. 

 Trochanters triangular, not elongate. Seventh ventral % deeply emar- 

 ginate, eighth elongate, narrower and pointed at tip. 



Black, prothorax with a large transverse fulvous spot behind the middle. Length 

 9 — 11 mm. 'Nevf England and Northern New York fraterniis Randall. 



