No. 1 6.] ORTHOPTERA OF CONNECTICUT. I49 



GRYLLOTALPIN^. 



The crickets of this sub-family have the fore legs modified 

 so that they are fitted for digging, and burrow in the ground. 

 The antennae are much shorter and stouter than in our other 

 Gryllidce. The ovipositor of the female is not extended so as 

 to be visible. 



Key to Genera. 



Body more than 25 mm. in length. Fore tibiae broadly ex- 

 panded and with prominent claws ; hind femora slender ; 

 tarsi three-jointed Gryllotalpa p. 149 



Body less than 10 mm. in length. Fore tibiae not broadly ex- 

 panded, but with three or four spines at the apex, hind 

 femora stout; tarsi with but one joint. . .Tridactylus p. 150 



Gryllotalpa Linnaeus. 

 Head small ; eyes about one-fourth as large as in other large- 

 sized Grylltdce. Pronotum large, the front emarginate, the pos- 

 terior margin well rounded, the dorsal surface and sides convex, 

 with the lateral carinae absent. Abdomen rounded, about twice 

 as long as pronotum. Fore legs modified for digging, very stout, 

 broad, flattened, and furnished at apex with four claws. The 

 upper two, which are the largest, are movable, while the others 

 are fixed. Posterior femora but slightly enlarged, and shorter 

 than the pronotum. Hind tarsi short. The ovipositor of the 

 female is not visible, and the sexes are distinguished by the dif- 

 ference in the venation of the upper wing covers, due to the 

 presence of the calling organ in the male. Cerci long and slender.. 



G. borealis Burmeister. G. Columbia Scudder. Northerrsi 

 Mole-cricket. Plate XI, 4. 



General color seal-brown, thickly covered with short, fine 



hairs, giving the insect a velvety appearance. The tegmina from 



about one-half to three-fourths the length of the abdomen. Wings 



dimorphic, slightly exceeding the tegmina in the short-winged 



form, or exceeding the tip of the abdomen in the long-winged 



form. 



Measurements. 

 Body ' Pronotum Tegmina Hind Femora 



26-30 7-9.5 Q-I2 7.5 



