114 DAVENPORT ACADEMY OF NATURAL SCIENCES. 



of June. The adults occur from the middle of June until the middle 

 of August, varying with the different species. In general the adult 

 stage of a given species lasts scarcely six weeks, while for the individ- 

 ual it is less than a month. The males usually appear a full week 

 before the females and disappear as much earlier. 



ARTIFICIAL KEY TO THE SPECIES. 



A. General color above fuscous or rusty brown, scarcely a trace of orange 

 or green. 

 B. Face greenish, a fuscous band above and a large spot below the 



ocelli tristis V. D. 



BB. Face unicolorous. 



C. Elytra broadly rounding at apex, dull brown with two or 



three round pale spots, female segment short 



tri)naci(lata Fitch. 



CC. Elytra longer and slightly pointed behind, rusty brown, 

 darker in the male, without distinct spots, female segment 



longer than width at apex sordida V. D, 



AA. General color orange or green, often maculate with ferruginous or 

 fuscous. 



B. Face unicolorous, species of medium or large size. 

 C. Elytra with more or less of orange, or maculate. 



D Elytra with a transverse hyaline band before the apex 

 of clavus. 

 E. Vertex and face yellowish or ferruginous. 



F. Elytra with a single hyaline band ; vertex right 



angled ferruginoides V. D. 



FF. Elytra with two transverse bands ; vertex ob- 

 tuse canadensis V. D. 



EE. Vertex and face olive brown, elytra hyaline, brown- 

 ish with a broad fuscous band at the base and a 



narrower one before the apex bifasciata V. D. 



I)D. Elytra without distinct transverse hyaline bands, costal 

 margin lighter. 

 E. Pronotum greenish. 



F. Pronotum with a black stripe just within the 

 lateral margin, entire clavus and a narrow stripe 



on around to apex of corium black 



suturalis O. & B. 



FF. Pronotum unicolorous green, clavus dark 

 brown at base, apex and all of the corium ex- 

 cept the costal margin hyaline brownish 



basalis V. D. 



