54 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



BLATTELLIN.E. 



Key to Genera. 



Size large. Sub-genital stylets present in the males. Teg- 

 mina of females abbreviated, not reaching more than 

 two-thirds the length of the broad abdomen 



Ischnoptera p._4 

 Size small. Sub-genital stylets absent in the males. Tegmina 



of both sexes fully developed Blattella p. 56 



Ischnoptera Burmeister. 



Body of male narrow and elongate, sides sub-parallel, female 

 with body wider and more rounded. Antennae much longer than 

 the body. Pronotum rounded, usually narrowed in front. 

 Tegmina longer than the abdomen in the males, much shorter 

 (in our species) in the females. Wings present. " Cerci long, 

 stout, 1 2- jointed, supra-anal plate of the male broad, apex either 

 truncated or rounded, that of the female narrower, triangular, 

 and obtuse. Sub-genital plate of the male bearing two rather 

 long stylets which are often deflexed. Last abdominal plate of 

 the female entire." This genus contains our two native species. 



Key to Species.* 

 Size large, total length 25 or more mm. Margin of prono- 



tum much lighter than disk pennsylvanica 



Size smaller, total length less than 20 mm. Pronotum more 



uniform in color. uhleriana 



I. pennsylvanica De Geer. Pennsylvania Cockroach. Plate 



VII, 2. 



Male: pronotum elliptical, slightly narrowed in front with 

 the margin straight. Posterior margin rounded. The disk with 

 an oblique posterior depression on either side. Tegmina long 

 and narrow extending much beyond the tip of the abdomen, 

 membranous and more or less transparent. Wings as long as 

 the tegmina. Female with the abdomen wider than the pronotum, 

 the width more than one-half its length. Pronotum wide with 

 the front margin narrowed and rounded, the posterior margin 

 narrowed truncate. Disk with no oblique depressions. Tegmina 

 broad, their inner margins overlapping, covering from one-half 

 to two-thirds the abdomen, the tips rounded, and the veins 



* See note page 162. 



