144 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



Type locality.— North America. Present location of type unknown 

 to the writer. 



DISTRIBUTION 



Material examined: 



Colorado: Ivywild, reared (B. T. Harvey). 



District of Columbia: Washington, June 3 (W. Middleton) ; June 16 (Hubbard 



and Schwarz). 

 Iowa: Ames, June 27 (L. S. Wells). 

 Kansas: Cowley, Cheyenne, Cherokee, and Rawlins Counties (R. H. Beamer). 



Douglas County (F. H. Snow). Onega (W. Knaus). 

 Maryland: Beltsville, June 4 (W. L. McAtee). Plummer Island, June-July 



(taken by all collectors). 

 North Carolina : No definite locality. 

 Pennsylvania: Allegheny County (Ehrmann). Harrisburg (Champlain and 



Knull). 

 South Dakota: Lennox, July 15 (L. L. Gardner). 

 Texas : No definite locality. 

 Virginia: Stone Creek. Lee County (Hubbard and Schwarz). 



Variations. — The species is quite variable in color, varying from 

 olive green to brownish cupreous. The depressions on the pronotum 

 are also variable; in some examples there is a broad, deep, median 

 depression, which is feebly interrupted at the middle, and the lateral 

 depressions deep, and extending from near the apical angles to the 

 base on inner side of the prehumeral carinae, whereas in other ex- 

 amples the lateral depressions are shallow, and the median depression 

 is only more or less indicated in front of the scutellum, and sometimes 

 with a small round depression on each side of the middle near the 

 anterior margin. The pubescent spots on the elytra are usually only 

 feebly indicated, and frequently the two anterior ones are entirely 

 wanting. 



Hosts. — Reared from the sapwood of dead willow {Salix sp.) 

 collected at Harrisburg, Pa., by A. B. Champlain and J. N. Knull, 

 and also from the same host in Colorado, by B. T. Harvey. This is 

 probably the species recorded as having been collected on partly dead 

 alders {Alnus sp.). although no specimens have been examined which 

 Avere collected on that plant. 



This species is very closely allied to granvlatus Say, and is con- 

 fused with that species in most collections, but from recent studies 

 and a knowledge of the habits of both species, it seems to be a valid 

 species as considered by LeConte. It differs from granulatus in 

 haying the front of the head more convex, and the pubescence not 

 obscuring the surface: pronotum with the lateral margins more 

 regularly rounded, and not strongly sinuate near the base, the 

 median depression usually more obsolete, especially the anterior part, 

 the lateral depressions scarcely pubescent, and the transverse rugae 

 deeper; elytra more gradually narrowed posteriorly, the tips more 



