76 ORTHOPTKRA 



lines ; mesothorax^ 1 lines ; raetathorax, 3i lines ; abdomen^ 7 lines 

 + 3 lines = 10 lines. 



In the Male the body is without spines, and the fourth abdominal 

 segment has no i'oliaceous appendages. 



Genus-ACANTHODERUS. 



Gray. 



Body scabrous. Head small, subquadrate. .Vntennse moderately 

 long, setaceous, with the second joint much shorter than the third. 

 Thorax cylindrical, shorter than the abdomen, spinose. Metathorax 

 nearly as long as the mesothorax. Abdomen rather short, cylindrical. 

 Legs moderately long, more or less spined, or furnished with foliaceous 

 lobes. Tarsi with the basal joint shorter than the two following. 



A. spiNiGER. White, Voy. " Ereb." and " Terror," Ins., p. 24 (1846). 



Male. Head greenish-grey, with a broadish protuberance between 

 the eyes, divided longitudinally in the middle ; vertex smooth ; 

 antennae greyish, with the third and following joints black at the tip 

 (only fourteen joints remain, of which the terminal ones are long) ; 

 prothorax greenish-grey, smooth; mesothorax narrow, green, cylindrical, 

 with about eighteen strong spines, placed somewhat in pairs, nine on 

 the upper and nine on the under side, brownish-black at the end ; 

 metathorax green, narrow, cylindrical, with three spines above and 

 eight below ; abdomen subrcylindrical, the joints thickened, first 

 segment with two spines in the middle on the under-side ; (fore legs 

 broken oif ;) two hind pairs greyish, with six wide brown bands ; 

 femora white at the base, with two short spines at the very end, and 

 two longer on the inside near the tip ; tibiae Avith a slight tooth on the 

 outside near the base ; tarsi slender. (White.) 



Length of the body, 3 inches 7 lines ; head, 2 lines ; prothorax, 

 1| lines; mesothorax, 10 lines; metathorax, 84 lines; abdomen, 19 

 lines + 3 lines = 22 lines. 



A. HORRiDus. White, Voy. " Ereb." and "Terror," Ins., p. 21, ^j/. 5, 

 /. 4 (1846) . Wesiwood, Cat. Orthop. Ins., p. 49. 



Head grey ; a slight ridge with four sinuations behind the antenna; 

 and between the eyes ; two spines and two or three tubercles on the 

 vertex. Prothorax grey, with several small irregular conical tubercles ; 

 meso- and metathorax brown, Avith many longish spines, especially on 

 the sides and under parts ; there are several tubercles on the upper 

 parts. Abdomen on the under side with spines shorter than those on 



