244 Anuals Entomological Society of America [Vol. Ill, 



with the bands of yellow of the prozonites. Venter pale. Le^s yellow. 

 Vertex and frontal region of head dark, a background of yellow being 

 closely covered wnth a network of black; clypeal and labial region 

 yellow. 



Head with median furrow of vertex sharply impressed, extending 

 to an imaginary line tangent to the dorsal edges of the bases of antennae 

 where it touches the mcsal angle of an impression extending between 

 antennae. Finely hirsute. 



Antennae slender, rather short. 



First dorsal plate a little narrower than the second. The lateral 

 and cc])halic margins together forming an even semicircular cur\'e; 

 •caudal margins of carinac oblique, the intervening caudal margin of 

 segment nearly straight. Mostly smooth and shining, finely rugose 

 along cephalo-lateral border. 



Dorsmn well arched, the carinae somewhat depressed below the 

 horizontal. Second segment with cephalo-lateral and caudo-lateral 

 angles a little larger than rectangular, narrowly rounded. In subse- 

 quent segments the cephalic border adjacent to cephalo-lateral angles 

 becomes more and more protruded ccj)halad, and the caudo-lateral 

 angles l^ccome more and more produced caudad in an acute angle or 

 process. 



Anal scutum terminating in a cylindrical process which is curved 

 A'cntrad and is truncate distally. 



Anal vah'cs strongly raised along free mesal margins. 



Anal scale triangular, the lateral margins convex proximally, else- 

 where nearly straight; caudal angle narrowly extended a little and 

 rounded. 



Ventral scuta transversely impressed, more strongly so on caudal 

 segments; a little extended at a small elevation or process at base of 

 each leg. 



Gonopods of male with the coxae relatively large and stout, distad 

 of this extending ventro-ccphalad ; narrowed distad and tenninating 

 in a blunt pointed process which curves mesad and a little ventrad and 

 then toward apex bending back jjroximad. On the vcntro-mesal sur- 

 face at one-third the length from coxae, an aculcly-jwintcd, blade-like 

 process, which curving mcso-ventrad and then distad crosses its fellow 

 in the middle line. Sec furlht-r, PI. XXXV, figs. 7 and <S. 



Length, W) mm. Width 4..") mm. 



Locality — Clotidcroft, Sacramento Mountains, New Mexi- 

 co (Sept. T. D. A. Cockercll). 



FAMILY POLVDESMIDAE. 



Scytonotus piger sj). nov. 



Dorsum dark, sometimes ol reddish caste. Venter but slightly or 

 nf>t at all paler than the dorsum. Legs unifonn brown or yellow. 

 Head and antennae dark brown. 



Head roughened. Vertex crossed by a short median longitudinal 

 impressed line. Hirsute with short stilT bristles which are rather 

 uniformly arranged. 



