Vol. 31, pp. 165-170 December 30, 1918 



PROCEEDINGS 



OF T1IK 



BIOLOGICAL SOCIETY OF WASHINGTON 



NEW SPIROBOLOID DIPLOPODS. 

 BY RALPH V. CHAMBERLIN. 



In working over a collection of diplopods from Claremont, 

 Cal., sent me for identification by Prof. W. A. Hilton, several 

 unnamed forms were found. Preliminary accounts of these 

 and three other new forms from the same State are given below 

 in order that the names may be validated for early use. The 

 typical material is all at the Museum of Comparative Zoology, 

 Cambridge. 



SPIROBOLIDAE. 

 Tylobolus claremontus, sp. nov. 



Readily distinguishable from other species in the form of the male 

 gonopods. In these the anterior median plate is broadly triangular, much 

 narrower across the distal end than in T. deses and the tip attaining 

 the level of the distal ends of the anterior coxal plates. The latter are 

 distally depressed, the distornesal corner oblique, not at all elevated or 

 produced. Tips of telopodites of anterior pair bent caudad and then 

 ectad, somewhat uncate. Telopodite of posterior gonopods strongly 

 uncate as usual; the distal spine more elongate and curved than in un- 

 cigerus, not pilose, and lacking any lobe at base such as present in deses. 

 General color brown; each segment with a black annul us in front of 

 suture, and also darkened along caudal border or not; in one specimen the 

 dark brown to reddish brown bands about the caudal borders are con- 

 spicuous while in front of the sutures the segments are scarcely at all 

 darkened; anal valves and collum dusky; legs fulvous. Clypeal 

 foveolae 5+5 or sometimes 6+6, counting a smaller one a little above 

 the level of the others on each side. Collum angularly narrowed below; 

 anterior margin flattened or very slightly concave opposite cardo. Second 

 somite extending well below level of collum, the ventrocaudal corner of 

 lower part oblique, the anterior vertical. Surface of somites in general 

 densely punctate in front of suture with the usual associated short striae, 



41— Proc. Hiol. Soc. Wash.. Vol. 31, 1918. (165) 



