150 Illinois State Laboratory of Natural History. 



preceding segment and about twice as long as wide; provided 

 with short apical setse. 



Antennae of the female 2 5 -segmented, reaching to the base 

 or the end of the furca. Antepenultimate article of the right 

 male antenna armed with a lamina produced anteriorly into 

 an unguiform process which is shorter than the penultimate 

 article. 



Outer ramus of the fifth pair of feet in the female obviously 

 three-segmented. Unguiform process of the second segment 

 arcuate, finely denticulate within and at the end, armed on 

 the outer margin near the base of the last segment with a 

 small spine. Last segment small but distinct and armed 

 with two short subequal spines. 



Inner ramus of fifth foot of female one-segmented, as long 

 as the basal segment of the outer ramus ; apex ciliate and 

 armed with two subequal spines, 



Left fifth leg of male reaching slightly beyond the end of 

 the first segment of the outer ramus of the right foot. First 

 basal segment armed on the outer margin with a short, sharp 

 spine. Second segment of the outer ramus oblong-ovate, 

 armed with two large spines ; inner margin delicately aculeate 

 toward the apex, and bearing a ciliate lamina. 



Inner ramus of left fifth leg one-segmented, quite long, 

 reaching beyond the middle of the second segment of the 

 outer ramus ; hairy at the apex. 



First basal segment of right fifth leg of male armed on the 

 outer margin with a rather long, sharp spine. First segment 

 of the outer ramus subquadrate, slightly longer than broad ; 

 second segment very long and narrow, more than twice as 

 long as the preceding segment. Marginal spine slender, 

 more than half as long as the segment itself, and inserted at 

 about the beginning of the distal third. Terminal hook long 

 and slightly curved. 



Inner ramus of right fifth leg one-segmented, rather long, 

 reaching beyond the end of the first segment of the outer 

 ramus ; apex acute, minutely ciliate. 



Length of female 1.1-1.2 mm. 



