C J. L. LECONTE, M. D. 



Marquette, Lake Superior; Messrs. Hubbard & Schwarz. The an- 

 tennee are slender, as long as the prothorax, with the 2d and 3d joints 

 united as long as the 4th. Diifers in no respect from Drasterius, though 

 the punctuation is much finer than in the other species. 



]»I EGA PERTHES Kiesenw. 



This genus only differs from Elater by the sutures of the prosternum 

 being not excavated in front between the sternum and the flanks ; the 

 2d and 3d antennal joints are frequently small, equal and together not 

 longer than the 4th, but in this respect there is not an entire uniformity. 



In all the species the prosternum is concave or channeled between the 

 front coxae, which is not the case in Elater. 



A. — Hind angles of prothorax unioarinnte. 



Opaque, very densely punctured. Antennae strongly serrate, joints 2-.''. ver}' 

 small shorter than 4th; in the male with stiff erect hairs 2 



Less densely punctured not opaque. Antennse moderately serrate 5. 



2. — Pubescence black ?>. 



Pubescence brown 4. 



3. — Beneath less finely and densely punctured; prosternum channeled between 

 thecoxee; color dull black, legs sometimes dark red; 9.5-11 mm. Oregon, 



Southern California 1. tartaroiis. 



Beneath finely more densely punctured, prosternum concave between the 

 coxae; black, elytra dirty yellow with darker clouds; 14 mm. San Diego, 



Cal 2. tiirbuleiitiis. 



Entirely black, abdomen very finely, still more densely punetui-ed ; proster- 

 num concave between the coxae; 9-lC mm. N^ew Mexico, Xorthern Cali- 

 fornia 3. aterriiniis. 



4. — Entirely black, very finely and densely punctured beneath ; prosternum con- 

 cave between the coxae; 13-16 mm. Penna 4. granulosus. 



Black, beneath very finely, densely punctured ; prosternum depressed between 

 the cox£e ; the whole of the limb of elytra and disc of prothorax reddish 

 yellow, the latter with a medial spot, basal and part of side-margin black ; 



8-11 mm. Middle and Southern States 5. liltibalis. 



5. — Antennae with the 2d and 3d joints small equal (i. 



Antennae with 3d joint longer than 2d 9. 



fi. — Prothorax yellowish at base 7. 



Prothorax entirely black 8. 



Prothorax and legs red, antennae of male with erect hair; body long, slender, 



prosternum black; 8 mm. California, Wash. Terr 6. njgriventris. 



7. — Pieeous, base of prothorax and elytra, and legs testaceous; 7 mm. Middle 



and Southern States 7. rufilabi'is. 



Black, two basal prothoracic spots at the hind angles yellow; elytra with the 

 anterior half and a transverse band behind the middle, and a small spot at 

 the anterior fourth black; 8 mm. California 8. elegaus. 



