ORTHOPTERA. 93 



like pod (Fig. 86). This pod varies in form in different genera ; but 

 is more or less bean-shaped. Upon one edge 

 there is a longitudinal slit. Within, the cap- 

 sule is divided into two spaces, in each of 

 which there is a row of separate chambers, F 'c. se.-Omheca of a Cock- 

 each chamber enclosing an egg. The females 



carry this pod, or ootheca, as it is termed, about with them, pro- 

 truding from the end of the abdomen for several days. 



The use of Pyrethrum or Persian insect-powder is the most effi- 

 cient means of ridding an infested house of these pests. It should 

 be sprinkled about their haunts at night, or blown into the cracks 

 from which they come. (See Chapter XIV., Pyrethrum). 



The Croton-bug (Bldtta gcrmdnicd). This is the best known of all 

 of the cockroaches in our Northern cities. The above popular name 

 originated in New York City, and was suggested by the fact that 

 these pests are very abundant, in houses, about the 

 water-pipes connected with the Croton Aqueduct. 

 The adult insect varies in length from II mm. to 13 

 mm. (0.43 in. to 0.51 in.). It is light brown in color, 

 with two longitudinal black stripes on the pronotum. 

 The wings extend beyond the tip of the abdomen. 

 This is an imported species, which has spread to 

 nearly all parts of the world, living upon ships, ami 

 spreading from them. (Fig. 87.) 



The Oriental Cockroach (I\riplancta oricntalis\ 

 This also is a cosmopolite, which, like the preceding 

 Is a great pest in dwellings throughout the civili/.ed world. 

 dark brown, and measures from 2O mm. to 23 mm. (o.S in. to 0.9 

 in. in length). With the females the tegmina are only about 4 mm. 

 in length, and have no wings under them. In tin- males both pairs 

 of win developed, but do not reach to the end of the 



abdomen. 



Of our native species then- are two which I have found vii\ CODQ 

 mon at the North. ihioun 



about 16 mm. (0.63 in.) in length, with a light strip 

 each >m the head along the margin of the pronotum and 



:1 half of the tegmin.i. The II ifl ; <TS do not cji: 

 of the abdomen. /Vti/awcdrs /V;///.s: mmh la: 



with lo: colored ' d wings. I , ml 



tip of the .ibdomrn. Th< margin of the pion 

 light, while the d : the lateral mar 



7 



