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 l . Anterior tibiae tetradactyle. . . Gryllotalpa Linne. 

 a 2 . Anterior tibiae bidactyle. . Scapteriscus 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 occurs throughout our territory, repre- 

 sented by several species. 



M YRME COPHILINAE . 



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 Myrmecophilinae. 



a 1 . Antennae stout ; hind femora ovate ; hind tibiae dilated, with 

 only three or four apical spurs. . Myrmecophila Latreille. 

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

 with six apical spurs. 



b l . First joint of hind tarsi sulcate and serrate ; pronotum not 

 produced posteriorly, the metanotum exposed. 



Mogosiplistus Serville. 



