62 



rsrcHE. 



[April 1S91. 



A LIST OF THE ORTHOPTERA OF ILLINOIS.— III.* 



BY JEROME MCNEILL, FAYETTKVILLE, ARK. 



ACRIDIDAE (OED1PODINI, TrUXALINI.) 



46. Arphia sulphiirea Fab. This 

 is a common species throughout the 

 state. In the northern part of the state 

 there is but one brood a year and the 

 individuals pass the winter as larvae or 

 pupae, being found in exactly the same 

 localities as Chortophaga viridifasciata 

 De Geer and Hippiscus tuberculatus 

 Pal. de Beauv. They become full fledged 

 as early as the 14th of May and disappear 

 about the first of July. 



*47. Arphia xanthoptera Burm. 

 This species is said by Thomas to in- 

 habit Illinois, but I have seen no speci- 

 mens that could be referred with cer- 

 tainty to this species unless indeeed A. 

 carinata Scudd. is a synonym. I have 

 been inclined to this opinion but Saus- 

 sure still continues to separate them and 

 it is probable that he has been able to 

 compare carinata Scudd. with Bur- 

 meister's type. 



48. Arphia carinata Scudd. This 

 is a very common species throughout 

 the state, formerly thought to be a 

 variety of sulphurea Fab., but it seems 

 to be quite distinct and the two species 

 are now placed in different divisions of 

 the genus. In practice they may be 

 distinguished by the facial costa which 



* In the first two parts of tins paper, in almost every 

 case where I have accredited specimens to the Museum 

 of tlie University of Illinois, I should have said the 

 Museum of the Illinois State Laboratory of Natural 

 History. 



is acuminate towards the vertex in 

 sulphurea, while in carinata Scudd. 

 the sides of the facial costa are nearly 

 parallel from the median ocellus to the 

 vertex. The carina of the pronotum of 

 the latter is very high and strongly 

 arched while in the former it is but little 

 elevated and nearly straight. The 

 earliest appearance of this species in 

 northern Illinois is the 20th of August. 



49. Arphia tenebrosa Scudd. Mr. 

 Thomas says this species is occasionally 

 seen in the extreme northwestern part 

 of the state. 



50. Chortophaga viridifasciata 

 De Geer. Common throughout the 

 state, though never very abundant. 

 The larvae and pupae winter in the same 

 situations with Arphia 'sulphurea and 

 complete their transformations only a 

 few days sooner than the last mentioned 

 species. This species is the first of the 

 order to reach maturity in the spring 

 and the note of the male is the beginning 

 of the grasshopper chorus -which con- 

 tinues for six months or more. It is a 

 very variable species, but all of the 

 varieties may be referred to two forms, 

 the green and the brown, which is a 

 seasonal form apparently and therefore 

 worthy of a name according to the rules 

 of systematic zoology. It should there- 

 fore be called Chortophaga viridifas- 

 ciata infuscata Harris. This form as 

 has frequently been remarked is the com- 



