REHN AND HEBABD 141 



portion of the caudal femora more or less creamy white. Oviposi- 

 tor becoming blackish brown distad. 



Distribution.— The present species is only known from a single 

 locality in southwestern Coahuila, Mexico. Nothing is known 

 regarding the habits of the species. 



Remarks.— The position held by insaroidcs is peculiar, sharing 

 as it does quite a few characters with two very different groups of 

 the genus, to one (Group B) of which, however, it is closely enough 

 related to be included. In general it may be said to show greatest 

 affinity to A. semialata, but it does not have the sexual dimorphism 

 in wing length found in that species, the apex of the stridulating 

 vein of the male is less produced and the ovipositor deeper. 



Specimens Examined: Jimulco, Coahuila, Mexico, November, (Lawrence 

 Bruner), 1 cf , 1 9 • Type and allotype. [Hebard Collection ex Bruner.] 



Arethaea phalangium (Scudder) (Figs. 43, 53 and 65.) 



1877. Aegipan phalangium Scudder, Proc. Bost. Soc. Nat. Hist., XIX, p. 40. 



[Georgia.] 



1878. A[rethaea] multiramosa Brunner, Monogr. Phaneropt., p. 235. 



[Georgia.] 

 1900. [Arethaea] phalangium Scudder, Proc. Davenp. Acad. Sci., VIII, p. 

 67. [Georgia.] 



1905. Arethaea phalangium Rehn and Hebard, Proc. Acad. Nat. Sci. Phila., 



1904, p. 795. [Thomasville, Georgia.] 



1906. Alrethaea] phalangium Kirby, Synon. Catal. Orthopt., II, p. 443. 



[Georgia.] 



1907. Arethaea phalangium Rehn and Hebard, Proc. Acad. Nat. Sci. Phila., 



1907, p. 300. [Gainesville, Florida.] 



This striking species, which is one of the largest in the genus, has 

 no close relationship to any other form of the genus but A. grallator, 

 to which it is closely related, differing chiefly in the larger general 

 size, very slightly longer tegmina and wings, the shorter stridulat- 

 ing field of the tegmina of the male, which is shorter than the pro- 

 notum, in the tegmina being somewhat broader at the distal fourth 

 than at the proximal third, in the distal extremity of the male sub- 

 genital plate being broader and less arcuato-emarginate with the 

 styliform processes more distant, and in the simpler coloration. 



Type.— 9 ; Georgia.''*' (H. K. Morrison.) [Scudder Collection.] 



"^ Scudder originally measured both sexes and gave male tTiaracters as 

 well as those of the female, but we are able to find only one typical female 

 in the series. 



TRANS. AM. ENT. SOC, XL. 



