OF WASHINGTON, VOLUME XII, 1<I|(). 121 



One male, St. Jean, Maroni River, French Guiana, July, 

 1904 (\V. Schausj. Another male is in the collection of Mr. 

 Paul Doguin from Nouveau Chantier, French Guiana, De- 

 cember (Le Moult). 



Type: No. 13060, U. S. National Museum. 



PARACRAGA Dyar. 

 Paracraga Dyar, Proc. U. S. Nat. Mus., xxix, I7<>, I'.MHi. 



Paracraga innocens Schaus. 



Paracraga innocens Schaus, Proc. U.S. Nat. Mus., xxix,:;:; 1, I'.MH;. 

 Four males and a female from French Guiana. A deli- 

 cately marked and frail species. 



Paracraga amianta Dyar. 



Paracraga amianta Dyar, Zoologica, i, 1/57, I'.HO. 

 The single type is from British Guiana. The species is 

 more strongly marked and less frail-looking than the preced- 

 ing. 



Paracraga canalicula Dognin. 



Paracraga canalicula Dognin, Het. nouv. de PAmer. du sud, i, 42, 

 L910. 



I have examined Dognin's unique type. The species is a 

 distinct one, with the two parallel lines not wavy. 



THE STRIDULATIONS OF SOME CONE-HEADED GRASS- 

 HOPPERS (CONOCEPHALUS).* 







[Orthoptera; Locustidae.] 

 BY H. A. ALLARD. 

 (Plate VI.) 



The number of species of Conocephalus in any particular 

 locality is never large. In their occurrence the individuals of 

 any species are usually widely scattered, and not more or less 

 grouped into colonies as are the orchelimums. These inter- 

 esting locusts prefer the tall grasses and reeds of meadows, 

 although some species occur in grass, briers, etc. As is char- 

 acteristic of nearly all our L,ocustidce, green or brown is the 

 usual coloration of the cone-headed grasshoppers. It is highly 

 probable that these colors are largely of a protective nature to 

 these insects, since everywhere their natural habitat is among 



*A11 the locusts listed in this paper were identified by Mr. A. N. Cau- 

 dell, of tho U. S. National Museum, except Conocephalus ensiger. 



