BLATTIDAE PANCHLORINAE 1 5 



b 2 . Eyes less distant than the antennal scrobes ; tegmina fully 



developed in both sexes. . . Periplaneta Burmeister. 



Pelmatosilpha and Stylopyga have only a single representative 



each ; the others have two or three species each. The species of 



Stylopyga and Periplaneta are introduced forms (from the Old 



World or the American tropics) and now occur widely over the 



United States. The others are found only in the extreme south. 



PANCHLORINAE. 



The two genera of this subfamily occurring in the United 

 States are each represented by a single introduced species, and 

 may be distinguished thus : 



Genera of Panchlorinae. 



a 1 . First joint of hind tarsi densely biseriately setose beneath 

 through the greater part of its length, and furnished at tip with 

 a small naked plantula. . . . Panchlora Burmeister. 

 a 2 . First joint of hind tarsi bare or nearly bare of bristles beneath, 

 a naked plantula extending very narrowly over the whole joint. 



Pycnoscelus Scudder. 



CORYDINAE. 



Represented in the region adjoining Mexico by Homoeogamia 

 Burmeister, of which we have probably more than one species. 



PLECTOPTEKINAE. 



A single species or two of Chorisoneura Brunner occur in the 

 extreme southern states from Georgia to Texas. 



PANESTHINAE. 



The anomalous genus Cryptocercus Scudder is represented by 

 a single species found from Virginia to California. 



