of the North American Ortlioptera. 429 



this species than in any other. A single female is the 

 only remaining type of Harris's nigra. The specimen 

 marked A. abbrcviata $ in the Harris collection, is a (? of 

 this species ; it does not differ materially from G. tieg-lec- 

 tiis in coloration, being generally not so dark, with more 

 or less reddish hind femora, while it has the wing-covers 

 somewhat longer than there; it seems to be our rarest 

 species. 



Length of ovipositor in two individuals, .23-.26 in., 

 average, .245 in. ; length of hind femora, .21-.23 in., aver- 

 age .22 in. 2 <?, 2 9. 



Mass., (H. Coll., S. H. S.) 



Neither of these two latter species can be referred to G. 

 Fennsylvanicus, Burm., which I have received from Mary- 

 land through Mr. Uhler. G. Pe mis ylv aniens agrees with 

 G. nigra in the length of the ovipositor of the female, but 

 it differs from it in the shortness and form of the wing- 

 covers, as well as in their color and that of the legs, in 

 which characters it agrees well with G. 7ieglectus, with 

 which it cannot be associated on account of the short- 

 ness of the ovipositor. I have another species, smaller than 

 any here mentioned, which I took in Minnesota, which has 

 a very long ovipositor, and also some quite peculiar forms 

 from southern Illinois, received from Mr. Thomas, but I 

 reserve their description till the reception of more speci- 

 mens. The males of all these species are very difficult to 

 distinguish ; indeed, it cannot be done satisfactorily with- 

 out a large number of specimens ; — the study of this genus 

 is certainly a very perplexing one. 



NEMOBIUS, SERVILLE. 

 1. N. EXIGUUS. 



Acheta exig-na, Say, Journ. Ac. Nat. Sc. Phil. ; IV. 309. 



(1825.) 



« " Say, Ent. of N. America (Ed. Le 



Conte) ; I. 238. (1859.) 



