ORTHOPTERA OF NEW ENGLAND. 433 



Genus Tridacttlus. Olivier (1789). 



Body somewhat depressed, the surface punctured and glassy. 

 Head and pronotum convex and slightly depressed. Antennae in- 

 serted beneath the eyes, and in a very lateral position. Eyes oval, 

 very distant from each other, and slightly projecting. Ocelli 

 placed in a line between the eyes, the two lateral ones against the 

 eyes, and the third (sometimes obsolete) between them. Second 

 joint of labial palpi and third joint of maxillary palpi not dilated. 



Elytra horny and opaque, not reaching to the end of the abdo- 

 men. Wings much longer, and folded lengthwise like a fan. In 

 the colder latitudes the wings are sometimes imperfect. Anterior 

 tibiae dilated, and armed at the end with four slightly curved 

 spurs ; the inside of the tibiae with a groove in which the tarsus 

 may be lodged. Middle tibiae with their edges ciliated, and their 

 four apical spurs very short. Fore and middle tarsi with the first 

 joint much shorter than the thu-d, and the second joint very short. 

 End of hind tibiae with four spurs finely hooked at the end. Hind 

 edges of these tibiae often dentate. There are four pairs of mova- 

 ble paddle-shaped organs near the outer end. Upper cerci (anal 

 appendages) composed of two joints, the lower ones entire and 

 blunt. 



Tridacttlus terminalis. Scudder. 



Length, from one-third to one-fourth of an inch. 



Head and thorax pitchy black, sometimes with reddish-brown 

 spots. Hind femora with two broad transverse white bands, and 

 a white spot near the end. The wings reach to the end of the 

 abdomen. — Cambridge^ Mass., Harris Collection. 



Genus Grtllotalpa. Latreille (1807). 

 Mole- Crickets. 



Posterior margin of the sternum of the eighth abdominal seg- 

 ment, in the males, entire. Fore tibiae broad and flattened, with 

 four spurs at the end, the upper two movable, the lower two 

 immovable. Hind femora shorter than the prothorax. First joint 

 of hind tarsi unarmed or obscurely spiued at the tip. The fore 

 legs, being very stout and strong, are admirably adapted for dig- 

 ging. Wing covers seldom reach beyond the middle of the abdo- 

 men. Anal cerci longer thau pronotum. 



