KATYDIDS AND THEIR KIN. 



203 



most common roach in the State, being found every- 

 where beneath the loose bark of logs and old stumps. 

 It is usually seen in the wingless 



The stages, the mature individuals being 



Pennsylvania . f - . ~ 



Cockroach common only from May to October. 



The half grown young are of a shining, 

 dark brown color, the dorsal surface of the thoracic 

 segments often lighter. The wings of adult specimens 

 are long and narrow, extending in both sexes much 

 beyond the tip of the abdo- 

 men. The total length is more 

 than an inch and the color is 

 reddish-brown w r ith a whitish 

 stripe on the margins of wings 

 and thorax. 



As mature specimens are at- 

 tracted by light, country houses 

 are often badly infested w r ith 

 them ; 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 question 

 as yet unsettled, but the larvee of other insects un- 

 doubtedly form a portion of their food, as in two 

 instances I have found them feeding upon the dead 

 grubs of a Tenebrio beetle; while living, as well 

 as decaying, vegetable matter probably forms the 

 other portion. The mating of the adults mostly 

 occurs in late summer and early autumn, the newly 

 hatched young being most abundant from mid- 

 September until December. The young in various 



Fig. 43 Pennsylvania Cock- 

 roach. (After Lugger.) 



