122 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



Type, allotype, and paratypes. — Cat. No. 40994, U.S.N.M. Para- 

 types in the collections of H. F. Wickham, C. A. Frost, Illinois 

 Natural History Survey, and the Academy of Natural Sciences of 

 Philadelphia 



Described from 32 specimens (one type). Thirteen were collected 

 at the type locality during July, some of which were reared from 

 Gambel's Oak (Quercus utahensis (A. de Candolle) Kydberg. Syn. Q. 

 gambelii Nuttall) by George Hofer; one collected July 18, 1917, at 

 the same locality by T. E. Snyder; 9 from Las Vegas, N. Mex. ; 6 

 from American Fork Canyon, Utah; one from Colorado Springs, 

 Colo. ; one from Flagstaff, and one from Williams, Ariz. 



The specimens examined are rather uniform in size, but the °olor 

 of the head and pronotum varies from dark green to golden green, 

 and sometimes with a slight cupreous tinge. 



This species is confused in collections with acutipennis, but can be 

 separated from that species by being distinctly bicolored on the 

 dorsal surface. 



37. AGRILUS CRIDDLEI Frost 



Figure 29 



Agrilus criddlel Frost, Canad. Ent., vol. 52, 1920, pp. 249-250— Nicolay, 

 Journ. N. Y. Ent. Soc, vol. 29, 1921, p. 175.— Chamberlin, Cat. Bupres- 

 tidae, 1926, p. 57. 



Male. — Form resembling anxius, moderately shining, and feebly 

 flattened above, bronzy black, with a slightly bluish and cupreous 

 reflection ; beneath slightly more bronzy and shining than above, and 

 with a distinct cupreous tinge. 



Head with the front wide, nearly flat, about equal in width at bot- 

 tom and top, without distinct depressions, lateral margins nearly 

 parallel, only feebly expanded at middle, and with a narrow, longi- 

 tudinal groove extending from occiput to middle of front; surface 

 coarsely, densely punctate, the punctures more or less confluent, and 

 sparsely clothed with short, inconspicuous, ?emierect. whitish hairs; 

 epistoma wide between the antennae, and broadly, deeply, arcuately 

 emarginate in front ; antennae extending be} r ond middle of pronotum, 

 serrate from the fourth joint, and the outer joints as wide as long; 

 eyes moderately large, and about equally rounded above and beneath. 



Pronotum one-half wider than long, base and apex about equal in 

 width, and widest at middle ; sides slightly, arcuately rounded ; when 

 viewed from the side the marginal carina is strongly sinuate, the 

 submarginal carina nearly straight, the two carinae widely separated 

 anteriorly, and connected to each other at the base ; anterior margin 

 rather deeply sinuate, with a broadly rounded median lobe; base 

 feebly emarginate at middle of each elytron, the median lobe broadly 



