NATURAL SCIENCES OF PHILADELPHIA. 87 



pressed striae parallel to the suture, the sides irregularly rugulose, 

 apex produced, suture mucronate. L. .70. California. 



% intermediate tibiae with a long narrow tooth near the base, 

 above serrate; last segment with a broad truncate emargination. 



9 Apex of last segment rounded. 



9 Yar. apex of last segment tridentate. 



25. D. sezualis, sp. n. 



Very closely allied to D. tenebrosa, but the male has the inter- 

 mediate tibia? simple, and the prosternum hairy; the female has 

 the apex of the abdomen rounded ; the elj'tral reliefs are higher, 

 smoother, and longer, so that the appearance is different. L. .68. 

 California, Oregon. 



From D. lugubris which it resembles in the ? , the strong 

 sculpture at once separates it. 



26. D. californica, sp. n. 



So closely allied to D. tenebrosa, that I can onlj'^ separate the 

 ^s, which have the tibia? simple, and the prosternum not pilose. 

 L. .65. California. 



Dicer'ca Lecontii, Gory, unknown formerly to Leconte, will 

 now come in the new genus Trachykele, Mars., which is based on 

 T. Blondeli [Abeille ii. 150] found at Paris, but which appears to 

 be N. American. The elytra of this species are now before me, 

 and do not present extreme differences from those of T. Leconlii, 

 of which it may be a large specimen. 



DiCERCA, Esch. 



A. Body elongate, elytra produced at tip into a prolonged mucro ; inter- 

 mediate tlbife of ^ dentate. 

 B. Elytral mucro simple. 



G. Thorax with two evident discoidal ridges. prolongaia. 



Cc. Thorax with scarcely visible ridges, brilliant geneous. 



divaricata. 

 Bb. Elytral mucro bidentate. pugionata. 



Aa. Apex of elytra not much produced, bidentate. 



B. Thorax and elytra uniform without elevated smooth ridges. 



obsctira, 

 Bb. Thorax and elytra uneven. 



C. % intermediate tibi^ dentate, front carinate. spreta, Lap. 

 Cc. % tibiae simple. 



B. Thorax broader than long, dilated in front. 



aspcrata. Lap. 

 Bd. Thorax longer than broad, lepida. 



