BLATTID AE BLATTINAE 1 3 



c 2 . No arolium between the claws'; pronotum and tegmina 

 more or less pilose ; anal field of wings uniplicate when at 

 rest, or simply folded without plication beneath the anterior 

 field. ........ Corydinae. 



b 2 . The supraanal plate short or rather short, the hind margin 



straight or rounded, not emarginate. 



c 1 . A distinct arolium between the claws ; subgenital plate 

 of male more or less produced, furnished with one style ; 

 tegmina and wings present. . . . Plectopterinae. 

 c 2 . No arolium between the claws ; subgenital plate of male 

 minute, without styles ; apterous. . . Panesthinae. 



BLATTINAE. 



Only half a dozen genera of this subfamily have been recog- 

 nized in the United States, although this is nearly half as many 

 as are known from Mexico and Central America and is a larger 

 number than appertain to any other of our subfamilies of Blat- 

 tidae, and the genera are represented by more species than in any 

 other subfamily. 



Genera of Blattinae. 



a 1 . Tegmina completely developed, or in the female rarely 

 abbreviate. 



b 1 . Tegmina membranaceous or slightly coriaceous. 



c 1 . Antennae basally incrassate, densely but briefly pilose, 

 often particolored. . . . Thyrsocera Burmeister. 

 c ' 2 . Antennae setaceous, sparsely pilose, unicolorous. 



d l . Ulnar vein of wings emitting complete branches to 

 the apical margin and incomplete branches to the vena 

 dividens. .... Zschnoptera Burmeister. 

 d 2 . Ulnar vein of wings emitting no incomplete branches 

 to the vena dividens. 



e 1 . Ulnar vein of wings undivided or furcate. 



JBlatta Linne". 

 e 2 . Ulnar vein of wings ramose. 



Phyllodromia Serville. 



