IOWA ACADEMY OF SCIENCES. 209 



August; third brood of larvae from middle of August until 

 the last week in September; third brood of adults from the 

 first week in September through October. 



DELTOCEPHALUS CONFIGURATUS UHL. 

 (PI xxiii, Fig. 3) 

 Bull. U. S. Geol. and Geog. Surv., IV, p. 511, 1878. 



This widely distributed species is the largest cf the genus in 

 America, and though the coloration is often so faint as to leave 

 it almost unicolorous above, it may be easily recognized by its 

 broad, blunt head as well as by its peculiar gecital structure. 

 The last ventral segment of the female terminates in an attenu- 

 ate bifid black process, and the male plates are strong, broad 

 and obliquely truncate. 



In the definitely colored individuals there is a white cross on 

 a white margined vertex of fuscous and alternatiug light and 

 fuscous stripes on the pronotum. The nervures of the elytra 

 are white, margined more or less strongly with fuscous. The 

 elytra vary in length, usually longer than abdomen. A median 

 impressed black line on the vertex is never entirely wanting. 

 Length, 4.50 to 5 mm. Closely related to D. hohemani Zatt, but 

 with male plates distinctly shorter, and not laterally excavated. 



The larvi© may be separated from sayi by the broader head, 

 rounder vertex and stouter form and from any other of the 

 striped larvae by the fuscous striated front. It is of a pale 

 brown above, with three indistinct stripes and a row of dots 

 just inside the narrow light margin on either side of the 

 abdomen. Front light, with indistinct fuscous striations. 



This species was first taken in great abundance as full-grown 

 larv83 and freshly issued adults on May 2nd and 12th. Within 

 two weeks the larvae had all disappeared, while the adults were 

 very numerous throughout June, and a few were found in July. 



This species occurred with albidus on the field that was 

 mowed June 25th, and as rec Tded for that species, was practi- 

 cally exterminated by the process. Though the field was under 

 continual observation throughout the remainder of the season 

 the only indication of a second brood was the sweeping of a half 

 grown larva July 16 th. These facts indicate that it has a very 

 similar life-history to albidus, the broods however occurring 

 from one to two weeks earlier, the second brood of larvte prob- 

 ably appearing the last week in June and continuing through 

 July; the second brood of adults from the last week in July 



