SUBPA M IL Y I. I'SK r I >( > M (.(I- 1 X .K. 



87 



- 

 Lugger.) 



infested with (hem; and where food is 

 scarce, the wall paper is sometimes much 

 injured for the sake of the paste beneath. 

 What the hordes of young which dwell 

 under the bark of logs live upon is a ques- 

 tion as yet unsettled, but the larva? of 

 other insects undoubtedly form a portion 

 of their food, as in two instances I have 

 found them feeding upon the dead grubs 

 of a Tcticltrlo beetle; while living as well 

 4 i. Male. (After as decaying vegetable matter probably 

 forms the other portion. The mating of the 

 imagoes probably occurs in late spring and early summer, the new- 

 ly hatched young being most abundant from mid- August until De- 

 cember. Females with ootheca protruding have been taken as 

 early as May 19th and as late as September 3d. The young in 

 various stages of growth survive the winter in the places men- 

 tioned, they being the most common insects noted in the woods 

 at that season. Cold has seemingly but little effect upon them, 

 as they scramble away almost as hurriedly when their protective 

 shelter of bark is removed on a day in mid-Jan- 

 uary with the mercury at zero, as they do in June 

 when it registers 100 degrees in the shade. 



The empty ootheca of this species are very com- 

 mon objects beneath the loose bark of logs and 

 especially beneath the long flakes of the shellbark 

 hickory. They are chestnut brown in color, from 

 5 to 9 mm. in length by 4 mm. in breadth, and are 

 much less flattened than those of BJattcUa c/cr- 

 'HKiiiicu. The dorsal or entire edge is slightly ^ g i 5 ^- (O Hginai e )' 

 curved, or bent imvard, after the fashion of a small 

 bean, while the other edge is minutely serrate. The young, after 

 hatching, evidently escape in the same manner as do those of the 

 Oriental roach, as no break is visible in the empty capsule. The 

 tegmina of the female are more variable in length than in other 

 of our native species of Blattida?, in two Indiana specimens at 

 hand reaching the apex of the 7th dorsal segment, while in two 

 others they cover only one-third the abdomen. 



The Pennsylvania wood-roach ranges from Quebec and On- 

 tario, Canada, and Scarboro, Maine, Avest to Minnesota, Nebraska 

 and Kansas, and south to Thomasville, Ga., and Brownsville, 



