SUBFAMILY VII. RIIAPIIIDOPIIORINJL. 635 



i found a number of specimens of half grown young in Sibert's 

 Cave on May 1(1. The adults were common in July, and in No- 

 vember the young, about one-third the size of mature specimens, 

 were frequent in Saltpetre Cave, but could not be found elsewhere. 

 The species may be represented in winter by the eggs as well as 

 by the young, as is the case among some other members of the 

 genus. 



In Saltpetre Cave, where in July stygius was very plentiful, all 

 \vere found within 100 feet of the entrance. They were never 

 seen on the floor, unless they leaped there when disturbed, but 

 were found resting on the sides of small projections and in small 

 cavities of the walls or roof, with their antenna 1 spread out before 

 them. If a lighted candle was held close to them they paid no 

 attention to it, but were very sensitive to its heat and to touch. 

 When disturbed they leap with agility, sometimes to a distance of 

 six feet, but with a little care can usually be readily picked up 

 with the fingers before they become frightened. 



The immature specimens from caves in Monroe and Owen 

 counties were darker than typical stygius, and were found on the 

 floors of the caves in one or two instances beneath loose rocks- 

 From their habits I was at first inclined to doubt their being 

 stygius, since it is quite difficult to name correctly the young of 

 any species of CeuthopMlus. However, Packard (1888, 70) states 

 that in Kentuck} 7 those living in the smaller caves are darker and 

 less bleached than those in the larger ones. 



Outside of Indiana C. stygius is recorded by Packard and 

 Scudder from a half dozen or more caves in Kentucky. Brunner 

 (1888, 309) records it from a cave at Dallas, Texas, and Morse 

 (1919a) from Beverly, Mass. It doubtless occurs in most of the 

 smaller caves of the northern states between New England and 

 the Mississippi. 



Candell (1916, 666) placed stygius as a variety of gracilipes, 

 stating that the "only separating characters seem to be the pro- 

 portional length of the legs and the armature of the hind femora, 

 characters useless in this instance through variation." How- 

 ever the teeth of ovipositor are so different in shape that, taking 

 them in connection with the other differences given in key and 

 description, I retain it as distinct. It is found only in the im- 

 mediate vicinity of or within caves while gracilipcs has a wide 

 distribution in regions where no caves exist. The C. sloanii Pack- 

 ard (1888, 63) is stated by Scudder to be based upon immature 

 specimens of stygius. 



