456 Illinois State Laboratory of Natmral History. 



Male antennae (Fig. 5) six-segmented, the last two 

 segments of the same lengt;h, together just equaling the 

 antepenultimate segment; "sense organs" on the distal 

 edge of the antepenultimate segment (Fig. 5), reaching 

 beyond the last segment, the transparent tips funnel- 

 shaped (Fig. 8). Palps of maxillae as in Fig. 9 and 10. 



Caudal rami (Fig. 6) long, straight, more than twice 

 as long as the terminal claw. Subtermiual claw throe 

 fourths the length of the terminal one, both being some- 

 what S-shaped, the shorter one quite noticeably so.- 

 Terminal seta small, one fifth the length of the terminal 

 claw; dorsal seta reaching one half the distance to the 

 subterrainal claw, and situated four times the width of 

 the ramus from it. 



This species is somewhat closely related to C. Candida 

 (0. F. Miiller), although easily distinguished b\^ the 

 form of the "sense organs" on the male antennae; by 

 the great length of the terminal setae of the second feet 

 (which more than equal the preceding three segments, 

 while in C. Candida they only equal the two preceding 

 the last) ; by the relative lengths of the terminal and 

 penultimate segments of the second feet, which in G. sig- 

 'laoides are as 1 to 2 and in 0. Candida as 1 to 4; and 

 by the comparative lengths of the terminal seta and 

 terminal claw of the caudal ramus — in C. sigmoides as 

 1 to 5, in C. cand!.da as less than 1 to 2. 



It is also somewhat closely allied to C. simpsoni, es- 

 pecially in the form of the second feet and the caudal 

 claws, but is easily distinguished from that species by 

 the foi'm of the shell, by the much greater length of the 

 terminal setae of the second feet, and by the fact that 

 both caudal claws are slightly S shaped in C. sigmoides, 

 while in C. simpsoni onl}' the subtermiual one is S-shaped, 

 and that very noticeably so. 



Described from a few male specimens collected at 

 Havana, 111., Ma^-, 1895. 



