90 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



the surface more sparsely punctured and less pubescent; antennae 

 shorter, and the outer joints slightly wider than long; surface above 

 piceous, the pronotum becoming aeneous toward the sides; beneath 

 black, with a more or less aeneous tinge; tibiae unarmed at apex; 

 first and second abdominal segments convex at middle, and the last 

 segment more acutely rounded at apex. 



Kedescribed from the male type in the collection of H. C. Fall. 



Type locality. — Hope, Ark. 



DISTRIBUTION 



Material examined : 



Arkansas: Hope, April 14 (Louise Knobel). 



Indiana: Evansville, June 27 (H. Soltau). 



Maryland: Plummer Island, reared (A. D. Hopkins) ; June 8 (A. Wetmore) ; 



May 25 (H. S. Barber). 

 Mississippi: Agricultural College, May 24 (F. M. Hull). 



New Jersey: Clenienton, May 30 ( ). 



North Carolina: Tryon, reared (W. F. Fiske). 



Ohio: Cincinnati (C. Dury). 



Virginia: Great Falls, May 19 (W. L. McAtee). Tazewell, June 9 (L. O. 



Jackson). Chain Bridge, June 5 (J. C. Bridwell). 

 West Virginia: Kanawha Station, reared (A. D. Hopkins). 



Variations. — Length 4.5 to 6 millimeters. The front of the head 

 in the male varies from bright blue to bronzy green. Sometimes 

 the sides of the pronotum are parallel to each other along the anterior 

 half, and the median depressions are moderately deep in some ex- 

 amples, whereas in others the depressions are scarcely indicated. 

 The anterior margin of the prosternal lobe is broadly truncate or 

 feebly emarginate, and sometimes the outer joints of the antennae are 

 as wide as long. 



Host. — This species has been reared from black walnut (Juglans 

 nigra Linnaeus) by A. D. Hopkins and W. F. Fiske, and the adults 

 are usually found feeding on the foliage of these trees. 



The males of this species are easily separated from those of the 

 allied species of this genus, in having the second abdominal segment 

 transversely concave, causing the posterior part of the abdomen to 

 be more or less bent downward, but the females can not be separated 

 from the allied species. 



26. AGRILUS FKOSTI Knull 



Figure 20 



Agrilus frostl Knull, Ent. News, vol. 31, 1920, pp. 8-9. — Frost and Weiss, 

 Canad. Ent., vol. 52, 1920, p. 206.— Nicolay, Journ. N. T. Ent. Soc, 

 vol. 29, 1921, p. 175.— Knull, Canad. Ent., vol. 54, 1922, p. 84.— Fall. 

 Bull. Brooklyn Ent. Soc, vol. 20, 1925, p. 182.— Knull, Ohio State 

 Univ. Studies, vol. 2. no. 2, 1925. p. 41, pi. 1, fig. 3. — Chamrerlin, 

 Cat. Buprestidae, 1926, p. 63. 



