ABT.18 XEW GENERA OF MILLIPEDS — COOK AND LOOMIS 15 



First segment subreniform, slightly emarginate in front and 

 behind ; the lateral anterior margin thick, rounded, and carried up as 

 a high ridge across the dorsal portion behind a thin, expanded margin 

 produced from the lower edge of the ridge. 



Subsequent segments slightly shining ; posterior division impressed 

 with many fine, short longitudinal striations much stronger at the 

 middle of the dorsum near the anterior edge of the subsegment; 

 plurae projecting slightly, forming a narrow raised lateral margin 

 of the segments ; pores of the fifth segment located low down on the 

 enlarged caudal corners of the anterior subsegment, pores on subse- 

 quent segments higher and on the posterior subsegment. 



Last segment exposed above, subtriangular ; segments immediately 

 preceding it sharply and deeply emarginate. 



Legs not reaching the sides of the body; sterna broad, separating 

 the legs, narrower and much more elevated behind ; coxae of all legs 

 at least half again as broad as the next joint, with the exception of the 

 first two pairs of legs the coxae have a large oval pit at apex on the 

 inner side; first and second pair of legs reduced in size and strongly 

 crassate, more noticeable in the male, and with the claws shorter and 

 less acute than on the other legs. 



Type.—Cdii. No. 977, U.S.N.M. 



Six mature specimens collected beneath bark of oak logs near Sen- 

 eca, Plumas County, Calif, December, 1922, and January, 1923, by 

 H. S Barber, and two other specimens from same locality collected in 

 March, 1924, by F. J. Silor. 



BDELLOZONIUM, new genus 



Type. — BdellozoniwTh cerviculatum, a new species from California. 



Diagnosis. — Related to PolyzoniuTn and Hypozoniurm^ but with the 

 clypeal portion of the head longer, the labral extremity broader and 

 more rounded, the antennae much longer and the joints more equal, 

 the anterior segments relatively smaller. 



Description. — Body small, moderately convex, with the body cavity 

 about three times as broad as high. 



Head very small, subconic, the clypeus gradually narrowed, the 

 apex obtusely angled in front; anterior surface pigmented. 



Eyes of four ocelli on each side in an oblique row, prominent, 

 heavily pigmented. 



Antennae deeply colored, scarcely clavate, long, projecting beyond 

 the sides of the body, joint 6 the longest; joints 3 and 5 subequal, 

 longer than joints 2 and 4; joints 5 and 6 longer and slightly thicker 

 than joints 2 to 4. 



First segment very small, scarcely longer than segment 2 and 

 about half as wide ; anterior margin with a fine raised rim. 



