20 GUIDE TO ORTHOPTERA 



Bacunculixae. 



This is an American group and of the eleven genera recog- 

 nized we have three, which may be distinguished by the following 

 table : — 



Genera of Bacuncxdinae. 



a ^. Hind femora armed beneath on the median line near apex 

 with one or more distinct spines. . Diapheromera Gray. 



a ^ Hind femora unarmed beneath next apex. 



h 1. Head, especially in the 9 , fm-nished in front between the 

 eyes with a pair of tubercles or longitudinal rugae, sometimes 

 highly developed; hind femora of $ hardly extending beyond 

 the middle of the fourth abdominal segment, relatively stout ; 

 first joint of hind tarsi of 9 shorter than the other joints 

 together. ....... Sermyle Stal. 



h -. Head unarmed in both sexes ; hind femora of 9 reaching 

 the end of the fourth abdominal segment, relatively slender ; 

 first joint of hind tarsi of 9 about equal to the other joints 

 together. ..... jBacuncuh/s Burraeister. 



The genera have been but little studied in this country. Dia- 

 pheroma is represented nearly everywhere and has several species, 

 probably including some as yet undescribed. The other genera 

 occurs only in the Gulf States, with one or two species each. 



Anisomorphinae. 



This also is an American group, with about half a dozen known 

 genera of which we possess two. 



Genera of Anisomorjyhinae. 



a 1. M esothorax twice as long as the prothorax ; basal joint of 

 antennae but little longer and little stouter than the second. 



Anisomorjyha Gray. 

 a ^. Mesothorax no longer than prothorax ; basal joint of antennae 

 fully twice as long and, especially on apical half, twice as stout 

 as the second joint. .... Tlmema Scudder. 



