ART. lu. WEST INDIAN MILLIPEDS CHAMBERLIN. 15 



In the great relative width of the light areas of keels and adja- 

 cent portion of dorsum differing in color from the other known 

 species. 



AMPHELICTOGON PINETORUM, new species. 



Plate 5, fig. 6. 



When in full color the dorsum is chocolate brown to black, with 

 the keels yellowish white, the mesal edge of each light area running 

 from anterior inner end of keel obliquely caudoectad to near middle 

 of caudal edge of keel. Under the lens each keel is seen to be 

 marked with numerous small dark dots. Sides also dark, uniform, 

 the venter light brown to nearly yellow. Last tergite dark, except- 

 ing the projecting cauda. Antennae and legs dark red. 



The second to fourth keels with a small lateral tooth. None of 

 the keels with tooth or projecting nodules on caudal margin. Pro- 

 cesses of keels all short ; those of nineteenth small and rounded, much 

 shorter than those of eighteenth which are longer than those of the 

 seventeenth. 



Lower branch of gonopods without tooth at point where it narrows 

 mto style ; the latter proximally with a strong sigmoidal flexure and 

 curled into a circle at tip. Blade of upper or anterior branch bent in 

 a semi-circle, acute, with a single subapical tooth (see pi. 5, fig. 6). 



Length.— 2%-2>0 mm. ; width of male 3 mm., of female 3.5 mm. 



Locality. — Isla de Pinos: Bibijagiia. (Barbour and Brooks, June, 

 1918), (Type locality). 



Cuba: San Diego de los Banos. (April 23, 1900. Palmer and 

 Riley.) 



Ty2:)e.—li. C. Z. 5,026: paratypes 5,027. 



RICODESMUS, new genus. 



Closely related to Chondrodesmus, but the superior branch of 

 gonopods slender, distally styliform, not sheathing the inferior 

 branch, which is also slender, and suggests that of Chondrodesmus. 

 Keels of middle and posterior regions narrower than in the latter 

 genus. 



Genotype. — Ricodesmus stejnegeri., new species. 



RICODESMUS STEJNEGERI, new species. 



Plate 5, fig. 7 ; plate 6, figs. 1, 2. 



Chestnut in a band across prozonite and anterior portion of meta- 

 zonite, the caudal part of metazonite covered by a lighter, sometimes 

 flavous, band that extends also along lateral border of keel, the flavous 

 band commonly broad, embracing most of metatergite. Legs and 

 antennae flavous. 



