AGYMNASTUS.— DISSOSTEIEA. 161 



l. Agymnastus ingens, Scudd. 



Leprus ingens, Scudd. Proc. Bost. Soc. Nat. Hist. xix. p. 32 (1877) \ 

 Agymnastus ingens, Scudd. Canad. Ent. xxix. p. 75 (1897) 2 . 



Hab. Nokth America, Middle California 1 2 . 



The sexes of this peculiar insect differ greatly in appearance. The male reminds 

 one strongly of Hippiscus neglectus and two or three of its immediate allies, while 

 the female with the very robust body and short wings inclines one at first glance to 

 associate it with the Eremobiini.] 



TROPIDOLOPHUS, Thomas. 



Gryllus, Say, Amer. Ent. iii. t. 34 (1828) (nee Linnaeus). 



Tropidolophus, Thomas, Rep. Acrid. N. Amer. (U.S. Geol. Surv. v.) p. 138, tab. fig. 1 (1873). 



This remarkable genus of locusts is monotypic, and in its distribution seems to be 

 confined to the plains of Northern Mexico and portions of the South-western United 

 States. 



1. Tropidolophus formosus, Say. 



Gryllus formosus, Say, Amer. Ent. (ed. Le Conte) i. p. 78, t. 34. fig. 8 (1859) 1 ; Thomas, Ann. 



Rep. U.S. Geol. Surv. Terr. ii. p. 266 (1871) 2 ; Glover, Illustr. Am. Ent., Orthopt. t. 9. fig. 5 



(1872) 3 . 

 Tropidolophus formosus, Thomas, Acrid. N. Am. pp. 138, 139, tab. fig. 1 (1873) 4 ; Sauss. Prodr. 



GEdip. p. 104 (1884) 5 . 



Hab. Noeth Ameeica, Arizona (Lemmon), New Mexico and northward to Colorado 

 and Nebraska 1-5 . — Mexico, Mazatlan {coll. Chicago Acad. Sci.), Casas Grandes, 

 Chihuahua (Dr. W. E. Hughes). 



This is one of the interesting species of N. -American locusts, nowhere abundant, 

 but widely distributed. The insect lives on the high prairies, where it is to be met 

 with among the short grasses, usually of the genus Bouteloua. 



DISSOSTEIRA, Scudder *. 



(Edipoda, Latreille, Earn. Nat. Regne Anim. (1825) et auctt. (in part.). 



Dissosteira, Scudder, Rep. Chief Eng. 1876, Append. JJ, p. 511 ; Saussure, Prodr. (Edip. p. 134 

 (1884). 

 A characteristic North- American genus composed of comparatively few species with 

 well-marked characters. Some of the representatives enjoy a wide distribution. 



* Dissosteira and the following four genera seem to be rather more closely related than usual and ma) 7 only 

 form well-marked sections in a rather variable and diversified section of the subfamily. Be this as it may, the 

 names are employed separately here. No doubt another genus should be added to include D. venusta, B. picti- 

 pennis, and D. planipennis, since all three of them are remarkably different from D. Carolina, D. longipennis, 

 and B. spurcata. They are likewise just as distinct from Spharagemon, which follows. 



biol. centr.-amee.. Orthopt., Vol. II., October 1905. Yy 



