42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



January 23, 1932. They were in company with two other species of 

 millipeds, Dilophops hullatns Loomis and Psochodesmus granulofrons 

 (ChamberHn). Two mature (i8-segmented) females were collected 

 also near Hillsborough, Carriacou Island, February 8, 1932. A young 

 specimen was collected at Petite Riviere de Artibonite, Haiti, July 

 1927, by H. F. Loomis. 



CHILAPHRODESMUS, n. gen. 



Type. — Chilaphrodesmus rubellus, n. sp. 



D iagnosis.^Relsitionship to the 19-segmented African genus Bac- 

 trodesmus is shown by the structure of the gonopods ; in both genera 

 the basal joint is large and hollowed out to receive the apical joint, 

 much as in the Stiodesmidae or Chytodesmidae. The dorsum in Chila- 

 phrodesmus, however, is not definitely tuberculate ; the repugnatorial 

 pores open from the side of the posterior angle of the keel rather than 

 from the dorsal surface of the keel ; and the posterior margin of the 

 penultimate segment is straight between the produced angles of the 

 keels, not toothed as in Bactrodesmus. 



Description. — Body about 7 times as long as broad, with 20 seg- 

 ments ; dorsum flattened, slightly convex ; lateral carinae projecting 

 as in Polydesmus. 



Head large, greatly exposed from above ; surface quite densely 

 hairy, the hairs of the vertex shorter than elsewhere; groove of 

 the vertex fine and faint. Antennae rather slender, scarcely clavate, 

 densely hirsute, especially the three outer joints ; joint 6 broadest but 

 not exceeding joint 3 in length ; next in order of length come joints 2, 

 5, and 4, with i and 7 the shortest and subequal, each half as long 

 as joint 2. 



First segment oval, much narrower than the head or the adjacent 

 segments ; anterior margin with a thin, raised rim extending from one 

 lateral angle to the other; behind this rim is a series of 10 very long 

 erect setae arising from tiny, inconspicuous swellings or granules ; 

 behind this series are two others, the median containing four setae, 

 the posterior six setae ; surface elsewhere definitely reticulated, as 

 is the surface of all the other segments. 



Second segment with the carinae longer than those of the segments 

 immediately following, especially segments 3 and 4. 



Second and ensuing segments with an anterior row of four long 

 erect setae and a posterior row of six smaller setae arising from 

 granules similar to those on the first segment ; each granule being in 

 the center of an indefinite low, convex area ; all segments except the 

 first and last with six setae projecting horizontally backward from 



