340 GRYLLIDAE chap, xiv 



This Insect, like so many others, is apparently becoming rare in 

 this country. 



A single fossil from the Lias has been described as belonging to 

 the Gryllidae, but in the Tertiary strata a variety of members of the 

 family have been discovered both in Europe and North America. 



The classification of Gryllidae is due to de Saussure,^ and is 

 said by Brunner to be very natural. In the following synopsis of 

 the tribes of crickets we give de Saussure's arrangement, except that 

 we follow Brunner in treating Tridactylides as a distinct tribe : 



1. Antennae ten-jointed ; posterior tarsi aborted. Tribe 1. Tridactylides. 



(Fig. 209, Tridactylus variegatus ; Fig. 210, Rhipipteryx sp.) 

 1'. Antennae many jointed ; posterior tarsi normal. 

 2. Tarsi compressed, the second joint minute. 



3. Anterior legs fossorial ; anterior tibiae at the apex with two to 

 four divisions. Pronotum elongate, ovate, rounded behind. 

 Female without ovipositor. Tribe 2. Gryllotalpides. (Fig. 

 206, front legs of Grijllotalpa ; Fig. 208, Gylindrodes kochi) 

 3'. Anterior legs formed for walking. Ovij^ositor of the female 

 visible (either elongate or rudimentary). 

 4. Posterior tibiae biseriately serrate. Tribe 3. Myrmeco- 



PHILIDES. 



4^ Posterior tibiae biseriately spinose. Ovipositor straight. 

 5, Antennae short, thickish, almost thread-like. Facial 

 scutehum exserted between antennae. Posterior tibiae 

 dilated. Gen. Myrmecophilar' 

 5'. Antennae elongate, setaceous. Facial scutehum trans- 

 verse, visible below the antennae. Tibiae slender. 

 6. Posterior tibiae armed with two strong spines, not 

 serrate between the spines. Tribe 4. Gryllides. 

 (Fig. 204, Gryllus domesticus ; Fig. 211, Platy- 

 blemmus lusitanicus.) 

 6'. Posterior tibiae slender, armed with slender spines, 

 and serrate between them. Tribe. 5. Oecan- 



THIDES. 



2'. Second joint of the tarsi depressed, heart-shaped. 



3. Posterior tibiae not serrate, but biseriately spinose. 



4. The spines on each side three and mobile ; apical spurs 

 on the inner side only two in number. Ovipositor short, 

 curved. Tribe 6. Trigonidiides. 

 4'. The spines numerous, fixed. Ovipositor elongate, straight. 

 Gen. Stenogryllxis. 

 3'. Posterior tibiae serrate and spinose on each side, the apical spurs, 

 as usual, three on each side. Ovipositor straight or curved. 

 Tribe 7. Eneopterides. 



' Mem. Soc. phys. Geneve, xxv. 1877, din^BioL Centr. Amer. Orthoptera, 1894, p. 198. 

 ^ The genus Myrmecophila, being exceptional in several respects, is treated separately. 





