80 FA JULY II. BLATTID^E. THE COCKROACHES. 



male with tegmina very delicate, and middle of median dor- 

 sal abdominal segment with a broad, heavy tuft of aggluti- 

 nated hairs, and also with a low, hairy transverse ridge in 

 front of this tuft (Fig. 37, B.) ; average length of body, $, 

 14.7, of tegmina, 15.2 mm. 24. ZEBRA. 



gg. Dorsal surface of abdomen not banded; tegmina of male dark 

 brown, their margins paler; disc of pronotum distinctly dark- 

 er than sides; seventh dorsal abdominal segment of male 

 produced so as to almost wholly conceal the eighth. 

 h. Larger, average size of pronotum of female, 5x6.1 mm.; 

 median and first dorsal abdominal segments of male each 

 concave at base, the concavity overhung with two eleva- 

 tions which are heavily supplied with hairs on the under 

 surface (Fig. 37, F.) ; average length of body, $, 20.7, of 

 tegmina, 21.2 mm. 25. PENNSYLVANIA. 



liJi. Smaller, average of pronotum of female, 4.3x5.6 mm., its 

 sides less strikingly pale; median dorsal abdominal segment 

 of male alone modified as in pennsylvanica (Fig. 37, E.) ; 

 average length of body, $ , 16.6, of tegmina, 18.6 mm. 



25a. DIVISA. 



ff. Tegmina of female surpassing the abdomen, sustained flight 

 possible in both sexes; size small, form slender; color pale 

 brownish-yellow; two male abdominal segments modified as in 

 lata; average length of body, $, 14, of pronotum, 3.1, of teg- 

 mina, 14.6 mm. 26. CAUDELLI. 



19. PARCOBLATTA BOLLIANA (Saussure & Zehntner), 1893, 40. Boll's Wood- 

 Roach. 



Small slender species, the females stouter and more compact, with dis- 

 tinctly broader head and pronotum. Male with head, disc of pronotum 

 and base of tegmina dark brown, shining, finely and sparsely pubescent 

 with suberect yellowish hairs; legs, lateral margins of pronotum and apical 

 portion of tegmina paler brown; ocellar spots and an area between the 

 thoracic impressions dull yellow. Female chocolate brown, the legs us- 

 ually darker than those of male. Ocelli well defined, male, represented 

 by small spots, female. Pronotum widest slightly behind the middle, that of 

 male with two distinct oblique impressions connected near base by a short 

 transverse one. Tegmina of female as described in key, their outer mar- 

 gins straight, upcurved; inner ones obliquely rounded into apex. Supra- 

 anal plate of male about twice as broad as long, feebly declivent toward 

 apex; of female with a blunt median carina, the apex broadly rounded. 

 Length of body, $, 10.112.8, 9, 9 10.7; of pronotum, $, 2.73, $, 2.9 

 3; of tegmina, $, 11.713.6, $, 1.71.9 mm. Width of pronotum, $, 

 3.64.2, $, 3.94.4; of tegmina, $, 3.84.6, $, 1.41.7 mm. (Fig. 39, A.) 



Ranges from Raleigh. X. Car., and Brunswick, Ga., north to 

 southern Illinois and Nebraska City, Neb., and west and south 

 to the Mexican border ; not yet recognized from either Indiana or 

 Florida. It is the only one of our nine eastern species of the 



