76 [Mat, 



postice subangustato, subtiliter punctulato, linea utrinque laterali distincta, disco 

 late impressa, elytris tenuiter striatis, vix punctulatis. Long. 05 07. 



Colorado River, California, abundant. The head is very finely punctulate, 

 and is distinctly channelled posteriorly; the discoidal impression of the thorax 

 is very faint, but it causes the anterior margin, in particular lights, to appear 

 slightly elevated. The male only differs from the female by the broader head 

 and longer and thinner antennae ; in both sexes, the first joint of the latter, al- 

 though thicker, is but little longer than the second. 



C. Frons vix producta, medio emarginata ; labrum breve, transversum. 



12. L. c e p h a 1 o t e s, elongatus depressus, niger nitidus glaber, capite thorace 

 maiore quadrato, sat punctato, mandibulis (maris) elongatis, thorace quadrato, 

 postice subangustato, subtiliter parce punctulato, lateribus recti's, linea laterali 

 tenui, elytris obsolete striato-punctulatis, testaceis, basi apice margine sutura- 

 que nigris. Long. *10. 



A very singular species, of which I found but a single male at the Colorado 

 River, in California. The head is quadrate, with parallel sides, and without im- 

 pressions ; the usual marginal line is distinct. The mandibles project beyond 

 the labrum, and are about half as long as the head, the tip is emarginate. The 

 labrum is broad and slighrly emarginate ; the antennae are more than half as long 

 as the body ; the first joint is not much larger than the second, but the last three 

 joints are distinctly larger than the preceding and subtriangular. The scuiel is 

 triangular. The under surface of the body is black, with the antennae and feet 

 piceous. 



Species unknown to me. 



13. L. longicornis Mann. Bull. Mosc. 1843, 303. Russian America. 



Dendrophagus Schonh. 



1. D. gla b e r Lee. Agassiz' Lake Sup. 223. Lake Superior and Lake Huron, 

 rare. From the punctures of the elytra proceed small hairs, which, however, 

 are invisible, except with a very powerful lens. 



2. D. C y g n ae i Mann. Bull. Mosc. 1846, 15. Sitka ; (unknown to me.) 



Brontes Fabr. 



1. B. dubius Fabr. Syst. El. 2, 97. Cueuius dubius Fabr. Ent. Syst. 

 emend. 2, 95. Oliv. Enc. Meth. 6, 242. Abundant in every part of the United 

 States east of the Rocky Mountains. The mandibles of the male are armed with 

 a very slender curved horn, which converges upwards to meet the one of the 

 opposite side. The upper surface of the body is sometimes entirely black ; some- 

 times the head, thorax and margin of the elytra are brown. 



2. B. debilis, ater, depressus opacus, dense punctatus, thorace latitudine vix 

 breviore, lateribus denticulatis, angulis anticis paulo productis, elytris subtilius 

 punctato-substriatis, lateribus magis declivibus, antennis piceis, pedibus testa- 

 ceis. Long. .17 .2. 



Georgia, not rare. Differs from the preceding by the thorax being not dis- 

 tinctly transverse, less strongly toothed at the sides, with the anterior angles 

 acute, but very slightly produced ; by the stria of the elytra being less punc- 

 tured, and by the sides being almost perpendicular. The sexual characters are 

 as in the preceding. 



3. B. truncatus Motschulsky, Bull. Mosc. 1845, 1, 92. Mann. Bull. Mosc. 

 1852, 364. 



California (San Jose,) and Russian America (according to Motschulsky.) This 

 species has the thorax formed almost as in the preceding, the anterior angles being 

 a little more produced ; the elytra are, however, deeply striate, with the inter- 

 stices more rough with elevated punctures; they are also more strongly carinate 

 towards the side. The sexual characters as in the preceding species, but in ad- 

 dition, the elytra of the male are longer, and obliquely slightly sinuated at the 

 apex. 



