MORGAN HEBARD 223 



ARENIVAGA Rehn 



1903. Arenivaga Rehn, Proc. Acad. Nat. Sci. Phila., 1903, p. 181. 

 1913. Arenivaga Caudell, Proc. U. S. Xat. Mus., xliv, p. 605. 



Genotype, by original selection: Arenivaga bolliana [Ilomoeo- 

 gamia bolliana] (Saussure). 



This genus differs from Homoeogamia in the absence of a distal 

 spine on the ventro-cephalic margin of the cephalic femora in both 

 sexes; in the male, the marginal and scapular fields of the tegmina 

 are narrower and styles are not present on the subgenital plate; 

 in the female, tegmina and wings are wanting and the subgenital 

 plate is simple. It agrees with Homoeogamia in the armament of the 

 median and caudal femora in both sexes, and, in the male, in the 

 character of the supra-anal plate and the incurved concealed geni- 

 tal hook. 



In addition to other generic features given in the key, we 

 would state that, in the male, the ocelli are decidedly produced, 

 with face deeply concave; the supra-anal plate is very thin, bilo- 

 bate, and the subgenital plate is of the same asymmetrical character 

 as in Homoeogamia mexicana, but more convex, with dextro-lateral 

 angle much more broadly rounded and distal margin decidedly 

 more concave-emarginate. In the females, the narrow, greatly 

 reduced eyes terminate dorsad above the antennal sockets, while 

 the clypeal swelling terminates dorsad distinctly below a line 

 drawn between the antennal bases (extending often as high as the 

 ventral margins of the antennal sockets). 



In the immature stages of the species of this genus, we find that 

 the males have minute, vestigial styles present laterad on the 

 caudal margin of the subgenital plate. In the immature females, 

 similar vestigial styles are present, laterad on the caudal margin 

 of the eighth ventral abdominal segment, which, with the seventh, 

 disappears in the adult condition, the sixth ventral abdominal 

 segment forming the subgenital plate. 



Arenivaga bolliana (Saussure) (Plate IX, figures 3 to 5.) 



1893. [Homoeogamia] bolliana Saussure, Rev. Suisse Zool., i, fasc. 2, p. 298. [cT, 

 Texas.] 



1904. Homoeogamia bolliana variety nigricans Caudell, Mus. Brooklyn Inst. A. 

 & S.. Sci. Bull., i. p. 107. [o'; Esperanza Ranch, Brownsville, Texas.) 



MEM. AM. EN'T. SOC, 2. 



