21 



cies, occurring east only as far as the Lake Michigan sand region. It 

 is a common bunch-grass species. 



AmpJiitoniiis bicolor Thorn. July 8. 



Taken at the Devil's Neck on a high grassy dune. A very active 

 species. This is one of the most typical plains species, and has for- 

 merly been recorded only from the western states, IMontana to Texas. 



Arphia sulphurca Fab. June 6, 7, 9, 23, 



One of the Oedipodinae, which are terricolous. A common and 

 widely distributed species, rare in sand prairie, however. The winter 

 is passed in the nymph stage. The adult state is reached as early as 

 May I according to Blatchley, and the species remains active till 

 about the middle of July, when it is replaced by Arphia xanthoptcra. 



ArpJiia xanthoptcra Burm. July 25, October 8. 



Taken at border of forest at Matanzas Lake, and at the Devil's 

 Hole in bunch-grass. This species is similar to A. sulphur ea, its 

 close relative, in habits and distribution. It is, however, larger and 

 of stronger flight. The chief difference is in time of appearance, and 

 there seems to be a mutual adaptation in this respect. Sidphurca 

 winters in the nymph stage; xanthoptcra does not become adult till 

 the other species is nearly gone. There is therefore no competition 

 between the two species, which otherwise might probably be keen 

 rivals. Certain other species show very similar seasonal distribution, 

 and it is thought that this may be explained in terms of removal from 

 competition. Neither of the two species is typical of bunch-grass or 

 sand prairie. One specimen of xanthoptcra had evidently run into a 

 plant of Opuntia, for a number of the spines and thorns were stuck 

 into the joints of the legs and in the neck joint. 



Chortophaga viridifasciata De Geer. April i. 



The winter is passed by this species in the nymph stage. The 

 locust is mature from April 15 till November i, according to 

 Blatchley. It is the first locust to reach maturity in the spring. It 

 is an unusual species, very widely distributed geographically, and 

 thrives in a great variety of habitats. It has no close relative. Two 

 nymphs were taken in the bunch-grass, but it is not typical of sand 

 prairie. 



Hippiscus phocnicoptcrus Germ. July 5, 19. 



Common in bunch-grass. Winters in the nymph stage. It ma- 

 tures probably late in May. There is a time adjustment with species 

 of Hippiscus, much as in Arphia. H. tubcrculatus is the earliest, fol- 

 lowed by phocnicoptcrus and haldcmanii, which in turn give place 



