the posterior half. Its sides extend a little below the front coxae, 

 and its anterior margin is concave. 



The tegmina or fore wings are leathery and heavily veined and 

 extend well beyond the middle of the abdomen. The venation of the 

 tegmina differs with the sex, but there is no variation in the tegmina 

 of an individual. In the male the vein which forms part of the 

 musical apparatus, and which is located on the basal third of the 

 tegmen, makes a distinct an^le of about 100 degrees with the prin- 

 cipal longitudinal veins. In the female the prominent veins are 

 generally longitudinal, and there is no conspicuous cross vein. The 

 second pair of wings is more ample and delicate than the tegmina, 

 and more finely veined. The wings fold in plaits and their apical 

 end is rolled, the tips extending beyond the tip of the abdomen but 

 usually not reaching the ends of the anal cerci. The pleurae and 

 dorsum of the last thoracic segment are provided beneath the wings 

 with long, fine, ruddy hairs. 



The greatest specialization for subterranean life is seen in the 

 fore legs. (See PL II, figs. A, B, C.) Their structure is strong and 

 powerful. The coxae and femora are thick and muscular and the 

 finger-like dactyls are strongly chitinized. The trochanter is a 

 chitinous blade which serves as a support and runner for the entire 

 leg. The tarsal dactyls are just above and outside of the tibial 

 dactyls, and the paired blades of these structures passing just out 

 of plane from very sharp and powerful scissors. 1 



The tympanum of the auditory apparatus is located on the upper 

 surface of the basal part of the tibia. Instead of being concealed 

 in a protecting cleft or fold of the chitin, as is the case in a closely 

 allied genus, Gryllotalpa, it is only partially protected by a chitinous 

 fold and may be easily seen as an oval white membrane stretched 

 over the auditory chamber. 



The mesothoracic legs show no particular specialization. The hind 

 legs have the femora well muscled for leaping, and the tibiae are 

 spined to assist, no doubt, in landing after leaping or flight. The 

 terminal tarsal joint of the hind leg is high and vertically flattened. 



ABDOMEN AND APPENDAGES. 



The abdomen is provided on the dorsal and ventral surfaces with 

 ruddy pubescence, and the first six abdominal terga have long ruddy 

 hairs (similar to those found on the metathorax) diminishing in 

 length on each succeeding segment. On the lateral abdominal plates 

 there are eight spiracles, seven of which are easily seen, while the 

 first is concealed under the tegmina. The anal cerci arise dorsally 

 from the tenth abdominal segment and are about one- fourth the body 



*A fuller description of the fore leg is given by Scudder (41, p. 12). 



