230 NORTH AMERICAN BLATTIDAE 



9 . General color of dorsal surface bay, often somewhat paler 

 mesad on the proximal portion of the abdomen. Pronotum with 

 lateral margins often with a very narrow, weakly defined, buffy 

 border. Underparts, excepting abdomen, buffy, the face and 

 limbs washed with orange, the tibiae slightly darker and the caudal 

 tibiae heavily washed with bay. Ventral surface of abdomen gla- 

 brous, mahogany red to burnt sienna, the subgenital plate with 

 rough surface approaching bay. 



Note below decided color differences in other material. 



Variation.— The interocular width in the males shows very 

 marked variation in some specimens before us. In the Lower Cali- 

 fornia series the majority of males are normal in this respect, a few 

 have this interspace slightly wider, while one or two have the mar- 

 gins of the eyes almost touching. 



The males from Iguala and Jojutla, both localities in the Rio de 

 las Balsas drainage, agree in being very dark in general coloration; 

 all but the cephalic margin of the pronotum is bone brown, the 

 tegmina of this color, mottled with a slightly paler shade. A simi- 

 lar intensive coloration is found in A. bolliana and A. apacha. 

 In the Jojutla specimen the interocular space is normal; in the 

 Iguala individual it is unusually broad, nearly two-thirds as w^de 

 as the interocellar space, but the example is easily determined by 

 the perfectly normal genitalia. 



The males from Kits Peak Rincon, Arizona and those from San 

 Lorenzo, Coahuila, are dark in general coloration, agreeing with the 

 specimens from southern Mexico discussed above, except that the 

 tegmina are not as dark. In the one perfect male from the latter 

 locality, the interocular space is exceptionally broad, over two- thirds 

 as wide as the interocellar space. 



The striking differences in interocular width, size and coloration 

 in these few specimens from so widely separated localities, in our 

 opinion, represent only the decided variation occurring within the 

 species. A much wider knowledge of the species and its distribu- 

 tion must exist before such features, known to be decidedly unstable 

 (but not to such extreme degrees) in scries from the same locality, 

 can be fully and definitely explained. 



