182 Wisconsin Academy of Sciences^ Arts, and Letters. 



culate; eostate and punctate above, outer one hairy at base; tbird 

 segment of third thoracic legs hooked; first abdominal legs of 

 male long, bifid, nearly straight, outer ramus longer, recurved, 

 inner ramus more abruptly curved near apex, not enlarged near 

 apex as in C. 'wisconsineosis ; tubercle or inner basal angle 

 small. 



C. gvacilUs (Bundy). Bulletin No. 1, 111. Mus. Nat. Hist., 1876. 

 Eostrum short, wide, depressed, toothles"^', concave above, nearly 

 right-angled in front ; cephalothorax laterally compressed, smooth 

 above, granulate on sides ; areola wanting ; cephalic carinse 

 prominent, ending behind in callosities ; antennal plates very 

 small and narrow ; eyes small; antennas short and slender; epis- 

 toma rounded in front ; third maxillipedes hairy on inner and 

 lower aspects ; hands large, smooth below, punctate above, strongly 

 toothed on inner margins ; fingers slender, gaping at base, de- 

 pressed, contiguous margins irregularly tuberculate, outer one 

 incurved, wide at base, movable one longer, tuberculate on outer 

 margin near base; carpus with one large and several small teeth 

 on inner margin ; brachium with two rows of sharp teeth on lower 

 margin ; third joint of third thoracic legs of male hooked ; first ab- 

 dominal legs of male truncate, with several small apical teeth, the 

 inner one longest, slender and directed obliquely outward ; bases 

 of these legs narrow and inserted into deep sinuses in the first ab- 

 dominal segment ; interpedal space long, narrow, reaching half way 

 from small basal tubercle to apex of legs. 



The second form male has shorter, less gaping fingers, smaller 

 hooks on third thoracic legs and articulated first abdominal legs. 



The annulus of the female is movable, small and round. It 

 consists of two half-rings, each of which embraces one end of the 

 other. Two tubercules on the anterior border are separated by 

 a slight furrow that widens behind, covering the posterior border. 



It occurs on the prairies in the vicinity of Eacioe, where it was 

 found by Dr. P. R. Hoy, to whose kindness I am indebted for 

 specimens. 



It is also found abundantly along water courses in early spring 

 at Normal, 111. (Prof. Forbes). 



