57G OKTHOPTERA. 



dropped the larva- are hatched. The common cockroach, 

 Blatta (Stylopyga) orientalis Linn, has rudimentary wings in 

 the female, while in the male they are shorter than the body. 

 In Periplaneta the wings are longer than the body, and the 

 supraanal plate is deeply fissured and the abdomen much 

 swollen. Periplaneta Americana Linn, is a commonly dis- 

 tributed species. The genus Platymodes differs from the pre- 

 ceding one in its narrower and longer body, and the supraanal 

 plate is not fissured ; the anal stylets are much shorter and 

 turned down, while the wings extend bej'ond the abdomen, the 

 anterior pair being well rounded at the tips. Platamodes Pen- 

 sylvanica DeGeer is pale, shining, reddish brown, and the an- 

 tennae reach back to the tips of the fore wings. It is found in 



woods under stones, entering 

 houses by night. 



In Ectobiu the wings are well 

 developed, and the basal joints of 

 the tarsi are shorter than the 

 others. The Ectobia (Vtr/m/ >//></ 

 Stephens (Fig. 569, male and fe- 

 male) is a pale species, and is 

 ? very abundant in houses in and 



Fi - r>(l!) - about Boston, where it is called 



the ''Croton bug." Ectobia Utlwpliila Harris is very common 

 in woods under stones in New England. The third joint of 

 its antennae is as long as the next five, collectively. 



In Cryptocercus both sexes are wingless ; the antennae are 

 half as long as the Avhole body, and the abdominal appendages 

 are not exserted, being very short. C. punctulatus Scudder is 

 known by its thickly punctured body and dark mahogany 

 brown color, with reddish beneath. It is found southwards. 

 In Pycnoscelus the males are wingless ; no females have yet 

 been found. It differs from Cryptocercus in having a larger 

 head ; the eyes are placed closer together, and the stylets are 

 slender, cylindrical, of about the same length as the cerci and 

 inserted just within them. Plate 1, fig. 2 represents the wing 

 of an extinct species of cockroach (Blattina?) discovered by 

 Mr. Barnes in the coal formation of Nova Scotia. While most 

 of the remains of cockroaches found in the Carboniferous rocks 



