SUBFAMILY II. OEDIPODIXJE. 255 



Harris (1841, 14G) founded the genus Tragocephala to include 

 the then known species of this genus, but that name was found 

 to be preoccupied by Dupont in Coleoptera. In the dimorphic col- 

 oration, form of head and habitats of its species, Chortophaga 

 forms a sort of connecting link between the Oedipodinse and the 

 Tryxalinae, it being formerly classed with the latter. It is the 

 only genus of Oedipodime whose members are notably dichro- 

 matic. Kirby (1910, 198) accredits four nominal species to the 

 genus, two from the United States, one from Cuba and one from 

 Costa Rica. A fifth has been since described. Two of these forms 

 inhabit our territory, one of them being herein regarded as only 

 a variety of the other. 



KEY TO EASTERN FORMS OF CHORTOPHAGA. 



a. Disk of vertex distinctly longer than broad, male, its greatest width 



subequal to its length, female; hind femora not barred on upper 



outer face. 110. VIRIDIFASCIATA. 



oo. Disk of vertex almost as broad as long, male, slightly broader than 



long, female; upper outer face of hind femora usually blotched with 



fUSCOUS. llOa. AUSTRALIOR. 



110. CHORTOPHAGA VIRIDIFASCIATA (DeGeer), 1773, 498. Northern Green- 

 striped Locust. 



Color dimorphic, either largely green with a small amount of brown 



upon the tegmina (vi- 

 ridifasciata) or wholly 

 brown (infuscata Har- 

 ris, 1841, 147). Speci- 

 mens are common, how- 

 ever, which can be re- 

 Fig. 93. Nymph and adult female. (After Riley.) ferred to either form 



the color being a mixture. The more pronounced green examples, with 

 head, pronotum, outer face of hind femora and basal two-thirds of median 

 field of tegmina grass-green, upper dorsal field, and apical third of teg- 

 mina, as well as a narrow stripe along their lower or costal margin, ash- 

 brown, abdomen reddish-brown; head, pronotum and hind femora rarely 

 reddish-purple instead of green. Brown form with apical halves of 

 tegmina darker, their sides often containing a few light spots. Hind tibiae 

 brown or pale blue with a white ring near base. Color of wings and 

 structural characters as given under generic heading. Length of body, $ , 

 1724, 9, 2232; of antennae, $, 78, 9, 67; of tegmina, <J , 1721, 

 9, 1825; of hind femora, $, 1113, 9, 1315 mm. (Fig. 93.) 



In Indiana this is the first locust to reach maturity in spring 

 from hibernating nymphs, specimens having been taken in Vigo 

 County as early as April 15th. It is a common species through- 

 out the State, making its home in blue-grass pastures, and espe- 

 cially in the grassy tracts along rail fences between upland woods 



