210 IOWA ACADEMY OF SCIENCES. 



through August, larvas again appearing sometime in Septem- 

 ber, going through the winter to appear again as adults in May. 

 Facts wliich materially strengthen these conclusions are that 

 while in these two species exterminated, known facts in their 

 life-history indicate that the eggs would have been deposited 

 before this time, and would thus be subject to destruction, 

 while other species occurring on the same area, whose eggs are 

 known to be deposited at other periods, remained abundant 

 throughout the season. That close mowing at the proper time 

 was an effectual check seemed to be thoroughly demonstrated 

 for these two species. There would be a second period, when 

 the eggs of the second brood might be destroyed, occurring, 

 according to the above determinations, toward the last of 

 August. 



DELTOCEPHALUS DEBILIS UHL. 



(Plate xxlii, Fig. 2.) 



Deltocephalus deMllt Uhler. Bull., U. S. Geol. and Geog. Surv., II, p. 360, 1876. 

 Ddtocephalus minki Fall. Provancher. Pet. Faun., Ill, p. 2V9, 1889. 



Although this is a very variable species in color, size and 

 genital characters, and approaches in its different variations 

 three recognized European species, abdomino.lis, Pab. , falleni 

 Fab., minid Fieb., the intergradation of these varieties pre- 

 vents their separation, for this country at least. An examina- 

 tion of the European material at hand indicates a similar 

 variation in their fauna. 



This species may be briefly characterized as follows: 



Color, usually deep green, more or less marked with black below, some- 

 times even appearing on the elytra. Vertex variable, more or less dis- 

 tinctly, acutely angled; length usually slightly greater than width; front 

 strong, broad above; sides straight; lora? long; genas with the lateral mar- 

 gins excavated below the eyes; outer angle very distinct, scarcely rounding 

 below the clypeus; elytra, length variable, usually exceeding abdomen; 

 venation distinct, central anteapical cell large, first anteapical narrow, elon- 

 gate, nearly parallel margined. 



Genitalia: Ultimate ventral segment of female varying from rounding 

 behind with a deep notch to nearly truncate, slightly lobed each side of a 

 shallow notch. Male valve obtuse, variably exposed; plates very broad at 

 base, slightly longer than wide, bluntly, obtusely pointed, lined or spotted 

 with black; length, 4 mm. 



This well known species is comparatively rare at Ames, a 

 few specimens being taken each year. During this season 

 adults were taken from the first week in June until the first 

 week in July, usually found in wooded regions. 



