MORSE: ORTHOPTERA OF NEW ENGLAND. 
421 
bears it leaves the other at nearly a right angle, and the femur 
becomes greatly enlarged and acquires a series of teeth on the 
under side. The two extremes are, however, connected by a full 
series of intermediate stages, and may be found in specimens 
taken at the same time and place. No explanation of the cause 
77 
Fig. 76. — Pygmy Mole-cricket, Tridactylua apicialis. (After Lugger.) 
Fig. 77. — Pygmy Mole-cricket, Tridactylus apicialis. Left front leg seen from behind, 
female; 2, male; 3, male; 4. male; 5, male, tibia closed upon the femur. A. P. Morse, del. 
of.the difference or of the particular function of the extraordinary 
bifurcate pattern of tibia has ever been suggested. 
The sexes resemble each other strongly but the female may be 
distinguished by the penultimate ventral segment of the abdomen 
having the hinder angles rounded and being very slightly emargi- 
nate in the middle, often with a brown thickening bordering the 
emargination. 
The body is smooth and shining, free from the dense pile 
characteristic of Gryllotalpa. The general effect is of a black 
insect varied wdth white spots on the hind femora and beneath. 
The young are brown and white. 
Measurements. 
Total 
Body Hind femora 
Wings surpass abdomen 
Average 
8 
7 8 
1 mm. 
15 
