FAMILY VI.— LOCUSTID.-E. 215 



a. Fore and middle tibiae sulcate or plane above, but 

 acutely margined, the outer margin spinulose or un- 

 armed, 

 b. Fastigium of vertex scarcely deflexed, acuminate, no 



broader than the first antennal joint Scudderiae. 



bb. Fastigium of vertex deflexed, obtuse, much broader 

 than the first antennal joint ; metasternum trun- 

 cate or with rounded lobes Amblycoryphse. 



aa.^ Fore and middle tibiae smooth above, without angular 

 margin, generalU' unarmed above; metasternum with 



elongated lobes Microcentra. 



Prof. Blatchlc}' gives the following key to genera of Phan- 

 cropterinse : 



a. Wing-covers of equal breadth throughout; supra-anal 

 plate of male with a long decurved spine which is 



notched at the end 1. Scudderia. 



aa. Wing-covers widest in the middle; supra-anal plate of 

 male not as above, 

 b. Hind femora but little if any shorter than wang- 

 covers; ovipositor well developed, curved gradu- 

 ally up wards 2. Amblvcorypha. 



bb. Hind femora much shorter than the wing-covers; 

 ovipositor very short, turned abruptly- upwards. 



3. Microcentrum. 

 The four species of Scudderia described in the text are 

 distinguished as follows : 

 a. Length of posterior femora 28 or more millimeters. 



b. Notch of supra-anal spine of male square with a 

 slight median tooth, almost as wide as the middle 

 of the upturned sub-anal spine; the lateral pro- 

 cesses slender and compressed.... cwrvicauc/a DeGeer. 

 bb. Notch of supra-anal spine of male acute and much 

 narrower than the middle of the upcurved sub- 

 anal spine ; the lateral processes (at side of notch) 

 broadly rounded with the lower margin thinner. 



furculata Brunner. 



