141 



um unarmed. Hind femora thick and heavy, turned inwards at the base, 

 channelled beneath, with the margins of the channels either serrate or 

 spined in the males, seldom armed in the females. Ovipositor well devel- 

 oped, nearly straight, a little upturned at the tip, the inner valves usually 

 strongly serrate on the under side of the apical fourth. Cerci of males 

 long, slender, usually very hairy. 



These insects are seldom seen except by the professional collector. They 

 are nocturnal in their ^habits, and during the day hide beneath stones 

 along the margins of small woodland streams, or beneath logs and chunks 

 in damp woods, in which places seldom lees than two, nor more than three 

 or four, are found associated together. Being wingless they make no noise, 

 and, like most other silent creatures, are supposed to be deaf, as no trace 

 of an ear drum is visible. 



That they are wellnigh omnivorous in their choice of food, I have de- 

 termined by keeping them in confinement, when (hey fed upon meat as 

 well as upon pieces of fruit and vegetables, seemingly preferring the latter. 

 The majority of the species evidently reach maturity and deposit their 

 eggs in the late summer or early autumn, as the full grown insects are 

 more common then, but have been taken as late as December 1st. The 

 eggs, which are supposed to be laid in the earth, usually hatch in April, 

 but some are hatched in autumn and the young live over winter (an anom- 

 aly among the Locustidse ?) as I have taken them in January and Febru- 

 ary, and at this writing, December 24th, have one in confinement which 

 has just passed the second moult. 



Several of the species inhabit caves and are usually of much larger size, 

 with longer antenna' and smaller compound eyes than those found above 

 ground. 



The males of these insects are quite readily separated by the size, num- 

 ber and relative positions of the spines on the under side of the hind 

 femora, as well as by the degree of curvature of the corresponding tibiae. 

 The females, having neither the spined posterior femora nor the curved 

 tibia-, are less readily distinguished by the color and the relative meas- 

 urements of the different organs. As the two sexes are colored alike and 

 are usually found in close proximity there will be little difficulty in plac- 

 ing the female after determining the male by the keys given below, which 

 mainly pertain to that sex alone. 



Seven species have, up to the present, been taken by the writer in In- 

 diana. 



