86 NORTH AMERICAN BLATTIDAE 



elongate, hollow ventrad, with lateral margins roundly expanding, then narrowing 

 and at the rounded apex again moderately expanding; mesad and adjacent is sit- 

 uated a very slender, elongate, aciculate process which (sometimes) is weakly curved 

 at its apex. Subgenital plate produced, with proximal portion weakly convex and 

 distal portion deplanate-ascendent,!" lateral margins weakly convex and weakly 

 convergent, rounding distad into the weakly oblique, nearly straight distal margin, 

 the dextral angle thus formed being slightly the more produced. On the ventral 

 surface of this plate, at these disto-lateral angles, are situated, in small sockets, 

 simple, slender styles, deflexed so that they lie on the ventral surface of the plate, 

 in length equalling half (or frequently more than half) the distance between their 

 bases. 1" Exposed portion of eighth dorsal abdominal segment, which is folded 

 laterad over the base of the subgenital plate, short, slightly longer than exposed 

 portion of seventh ventral abdominal segment. 



Characters of Female. — (Topotype. Ehrenberg, Arizona.) Size small, not as 

 compact as in bolliana, but with pronotal proportions similar. Head larger and 

 more convex than in male. Interocular space considerably wider than that be- 

 tween antennal sockets, minute ocellar spots present. Maxillary palpi short and 

 stout. Tegmina widely separated, form much as in bolliana, reaching very slightly 

 beyond caudal margin of mesonotum, veins appreciable, surface weakly convex to 

 marginal field, which is weakly concave with costal margin cingulate. Wings 

 absent. Supra-anal plate with lateral margins weakly convex and nearly trans- 

 verse proximad, thence weakly concave and strongly convergent to rather sharply 

 rounded apex. Cerci very short, much more compressed than in male, fusiform, 

 with dorsal surface weakly convex. Subgenital plate convex, little produced, with 

 free margin rather weakly convex. 



Measurements {in millimeters) 



-H Length of Length of Width of Length of Width of 



^ body pronotuni pronotum tegmen tegmen 



Oregon (2) 12-13. 6 3-3-6 4-4.6 14-15-8 4.3-5 



Mount Shasta, Cali- 

 fornia (2) 14-14-3 3-3-3 4 4-1-4-3 15-2-17 4-4-5-3 



Sonoma County, Cali- 

 fornia (7) 13. 5-14. 8 3-3-3-7 4-5 14-8-16.3 4.6-5 



Fresno, California (2) 12. 2-13. 8 3.3-3.3 4.2 13. 6-13. 8 4.2-4.2 



Lower California, Mex- 

 ico 12.7 2.8 3.8 13.7 4.3 



1^' Rarely the distal margin, at the bases of the styles, is narrowly curved downward. 



'^2 In the males of the present species, the margins of the subgenital plate are often 

 subchitinous and show various degrees of individual irregularity, as do the styles both 

 in actual length and position. 



