132 BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



vertical portion of abdominal segments more broadly visible above, 

 and the tarsal claws similar on all feet, cleft near the middle, the 

 inner tooth slightly shorter than outer one, slightly turned inward, 

 but the tips distant. 



Redoscribed from the male type (except the anterior claws) in the 

 collection of C. A. Frost. 



Type locality. — Framingham, Mass. 



DISTRIBUTION 



Material examined : 



Connecticut: New Haven, June 12; Portland, June 5; and Hamden, June 20 

 (B. H. Walden). Lyme, May-June (Fisher, Champlain). 



Massachusetts : Framingham, May 31-June 14 ; Sherborn, July 29 ; and Hub- 

 bardston (C. A. Frost). 



Pennsylvania: Delaware County, May 19; Castle Rock (G. M. Greene). 



Variations. — This species shows considerable variation. The color 

 of the elytra varying from olivaceous black to olivaceous brown, and 

 the front of the head in the males from green to bronzy brown. 

 Pronotum with the median depression somewhat variable in depth, 

 sometimes with a small round depression on each side of the middle, 

 the lateral margins are nearly parallel to each other at the middle 

 and rarely with vague prehumeral carinae. Scutellum usually with 

 the transverse carina entire, but occasionally it is interrupted at the 

 middle. The elytra are usually rather acutely rounded at the tips, 

 and in some examples the longitudinal costae are scarcely indicated. 

 The color beneath varies from olivaceous green to bronzy cupreous, 

 the prosternal lobe is sometimes vaguely emarginate at the middle, 

 the pubescence varying from yellowish white to golden yellow, 

 rarely the vertical parts of the second abdominal segment are nearly 

 glabrous, and in one female from New Haven the suture between the 

 first and second abdominal segments is distinct for one-half the 

 distance to the middle. Length 7.75 to 11.8 millimeters. 



Host. — The larval habits are unknown, but Frost has collected the 

 adults on red oak (Quercus rubra Linnaeus), which suggests that it 

 may be the host for the larvae. 



This seems to be a valid species, but it is so closely allied to 

 quadriimpressus Ziegler, that it is difficult to give characters in the 

 table for separating all of the examples of both species satisfac- 

 torily. In auricomus the pronotum is usually more deeply depressed 

 on the median part toward the anterior margin, the elytra more 

 acutely rounded at the tips, and distinctly wider at the base than 

 at the apical third, and the vertical parts of the abdominal segments 

 are usually densely clothed with golden yellow pubescence. The male 

 genitalia in auricomus have the lateral lobes feebly but arcuately 

 narrowed to the tips, which are acute, and the median lobe acuminate 



