GRYLLIDAE — GRYLLOTALPINAE 63 



Tribes of Gryllotalpinae. 

 a 1. Head furnished with two large ocelli; fore tibiae dilated, 

 markedly digitate; hind femora scarcely saltatorial; tarsi 3- 

 jointed. ....... Gryllotalpini. 



a 2. Head furnished with three small ocelli ; fore tibiae scarcely 

 dilated, 3-4 spined apically ; hind femora strongly saltatorial ; 

 tarsi uniarticulate or aborted. . . . Tridactylini. 



Gryllotalpini. 

 Both the known genera of this tribe occur in the United States. 



Genera of Gryllotalpini. 



a^. Anterior tibiae tetradactyle. . . Gryllotalpa\J\.nx\k.. 



a"^. Anterior tibiae bidactyle. . ^Scop^eWsci^s Scudder. 



Scapteriscus occurs only along the margin of the Gulf of 



Mexico ; Gryllotalpa everywhere ; and each is represented by 

 two or three species. 



Tridactylini. 



One of the two genera of this group, Tridactylus Olivier, is a 

 cosmopolitan genus which occm-s throughout om* territory, repre- 

 sented by several species. 



Mykmecophilinae. 

 Only three of the eleven known genera of this family occur in 

 the United States, two of them shared with Europe, one with trop- 

 ical America. 



Genera of Myrinecophilinae. 

 a ^. Antennae stout ; hind femora ovate ; hind tibiae dilated, with 

 only three or four apical spurs. . Myrmecoiyhila Latreille. 

 a 2. Antennae slender ; hind femora elongate ; hind tibiae slender, 

 with six apical spurs. 



h ^ Fii'st joint of hind tarsi sulcate and serrate ; pronotum not 

 produced posteriorly, the metanotum exposed. 



3Iogosiplistus Serville. 



