328 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



tion at the middle ; prosternal process rather broad, the sides nearly- 

 parallel to behind the coxal cavities, then obliquely narrowed to the 

 apex, which is obtusely rounded. Posterior coxae with the posterior 

 margin nearly transversely truncate, or feebly sinuate, and the ex- 

 terior angle rectangular, and not prolonged. Tibiae slender, the 

 anterior and middle pairs slightly arcuate, and armed with a short 

 tooth on inner margin at apex. Posterior tarsi about as long as the 

 tibiae, and the first joint as long as the following three joints united. 

 Tarsal claws similar on all feet, cleft near the middle, the outer 

 tooth long and acute, the inner tooth broad, about one-half as long 

 as outer one, and not turned inward. 



Female. — Differs from the male in having the front of head more 

 bronzy green, the lateral margins nearly parallel, more sparsely 

 punctured, and not quite so densely granulose and pubescent; pro- 

 sternum more coarsely punctured, not clothed with long pubescence, 

 and the prosternal lobe subtruncate in front; anterior and middle 

 tibiae unarmed at apex; first two abdominal segments convex, and 

 without long pubescence at middle, and the hind tarsi slightly 

 shorter than the tibiae. 



Length, 3.5-5.5 mm. ; width 1-1.6 mm. 



Type locality. — North America. Originally described from the 

 Gory collection, but present location of type is unknown to writer. 



Distribution. — This species has a wide distribution, being found 

 in eastern Canada (Quebec, Ontario) and the eastern and south- 

 western part of the United States. Material has been examined 

 from various localities in the following States: Arizona, Connecti- 

 cut, District of Columbia, Illinois, Indiana, Iowa, Kentucky, Louisi- 

 ana, Maryland, Massachusetts, Michigan, Mississippi, Nebraska, New 

 Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, 

 Pennsylvania, South Carolina, Tennessee, Texas, Virginia, West 

 Virginia, and Wisconsin. 



Variations. — Notwithstanding the wide area over which this species 

 is distributed, there seems to be very little variation, except in size and 

 color. The color varies from cupreous brown to olivaceous green, 

 and all intermediate shades can be found in a large series of specimens. 

 Some examples are slightly more robust than others, the pubescence 

 on the upper surface is slightly more distinct, and the median depres- 

 sions on the pronotum are usually distinct, but occasionally specimens 

 are found in which the depressions are obsolete. 



Hosts. — This species has been reared a number of times by dif- 

 ferent workers from black locust (Robinia pseudoacacia Linnaeus) 

 which seems to be its common host plant. It has also been reared from 

 the New Mexican locust {Robinia neomexicana Gray) by Hubbard 

 and Schwarz. It has been recorded a number of times in the literature 



