162 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



triangular apex projecting for about half its length beyond the 

 closed anal valves. 



Anal valves moderately convex, not thickened nor prominent, the 

 edges meeting in a slight groove. Surface nearly smooth. Preanal 

 scale short, broadly rounded. 



Coleopods with ventral plate rudimentary, not produced in the 

 middle, exposing the whole of the long, subquadrate anterior lobes, 

 which are closely approximate along the median line. 



Gonopods rather straight, the projecting apex consisting of two 

 parts, the mesial a simple oblong transverse blade, the lateral shorter 

 and ending in two incurved prongs that partially embrace the middle 

 of the mesial blade. 



Sixth and seventh segments of males not notably enlarged nor 

 prominent below; coalesced pleura? of seventh segment crossed by a 

 broad flattened elevation, not projecting as a crest, the median 

 suture distinct. 



The very broadly rounded lateral margins of the first segment and 

 the projecting apex of the last segment would at once distinguish 

 this genus from all members of the order Anocheta previously known 

 in the United States without taking the other peculiar characters 

 into account. The affinity with Eurelus and Onyclielus is certainly 

 very slight, but there is still less with the more northern genera 

 Arctobolus and Tylobolus. 



The absence of scobinse and of a median process from the ventral 

 plate of the coleopods distinguish Anelus from the Mexican and Cen- 

 tral American forms that have the last segment produced. The 

 broadly rounded first segment might be supposed to ally this genus 

 with Rhinocricus as well as the produced last segment, but it does not 

 appear that there is any real affinity with the scobinate forms. 



ANELUS REDUNCUS, new species. 



Type. — Cat. No. 798, U. S. National Museum, collected near 

 Brownsville, Texas, January, 1905, by O. F. Cook. 



Length of male about 30 mm., width about 3 mm. Number of 

 segments, 44. The largest female specimens are nearly 4 mm. in 

 diameter. 



Color in life slate gray, the dark background modified by pale 

 bluish punctations not large enough to be distinguished by the naked 

 eye. Alcoholic specimens change to a moderate!}^ dark grayish 

 brown, but distinctly banded. The midbelt still appears gray and 

 the anterior part of the hindbelt dark brown. Posterior part of hind- 

 belt and exposed parts of forebelt light brown. 



Clypeal fovealse three on each side, the two upper close together, 

 the lower much more widely separated ; surface of clypeus and vertex 

 smooth and shining. • 



Eyes rounded, of 17 ocelli, arranged in five rows — 3, 4, 4, 4, 2. 



