1918] Chamberlin — New Polydesmoid Diplopods 125 



men somewhat smoky brown with the lateral carinae paler, yellow- 

 ish. A dark median longitudinal dorsal line is evident in the pos- 

 terior portion. Antennae and legs yellowish. 



A slender species narrowed decidedly at the ends but elsewhere 

 uniform in width. The posterior margins of the anterior somites 

 are bent back slightly, those of the succeeding ones in going caudad 

 more and more strongly so. The posterior corners of the last three 

 pairs of carinse strongly produced caudad but not acute, the distal 

 ends being strongly rounded, the corners of the others more angular, 



Vertigial sulcus ending as usual at the angle of a transverse arcu- 

 ate sulcus between the antennal sockets, the latter sulcus much 

 weaker than the vertigial and becoming obscure toward the ends. 



In the male the sternites in the region caudad of the gonopods 

 are produced at the ends, adjacent to the legs, caudad into sharp, 

 straight conical processes ; on the anterior half of the fourth somite 

 are two distally rounded, subconical processes. The genital proc- 

 esses of the second coxae are slendeily conical and short and pro- 

 ject subcaudad. Coxae unarmed. In what is regarded as the 

 female of this species the sternites are not produced but the coxae of 

 the middle and posterior regions are at their distal ends produced 

 ventrad into acutely tipped conical processes which decrease in 

 size in going cephalad. 



The species is readily distinguished by the character of the male 

 gonopods. The principal branch is above the basal joint subcylin- 

 drical to below middle of length where it is abruptly narrowed into 

 a slender blade which is moderately curved, but not at all coiled, 

 its acute tip meeting that of the opposite gonopod at the median 

 line. The caudal branch is long though not quite reaching the end 

 of the main branch; it presents a decided double or sigmoid 

 flexure, the acute tip bending across that of the other one; at the 

 level of the first flexure on the ventral side there is a short acute 

 spur. 



Length of type (male) near 27 mm.; width, 5.5 mm. 



Locality: East Tennessee: Burbank. A male and female col- 

 lected by Dr. R. Thaxter. 



Nannaria media sp. nov. 



When in full color this species is deep chestnut above with the 

 posterior corners of the lateral carinae yellow. Beneath the color 



