62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



Loomis. A mature female and one with 19 segments were collected 

 on Morne Pilboreau, March 21, 1930, by O. F. Cook. A female was 

 collected under a rock with specimens of Psochodesmus gramdofrons 

 (Chamberlin) on one of the grassy hills south of Basse Terre, St. 

 Kitts, January 23, 1932. 



Description. — Length 4.5 mm, width .7 mm. 



Living colors recorded as dirty white throughout. 



In addition to the characters given in the generic description the 

 following features are of value. 



On the first segment in front of each large tubercle of the anterior 

 series there is a small, rounded granule or tul^ercle, and a similar 

 granule is located just behind each interval between the tubercles of 

 both rows ; thus there are three granules behind the anterior row and 

 five behind the posterior row. 



On the ensuing segments there usually is a small granule on the 

 anterior and posterior border between the outer and inner row of 

 tubercles on each side, and another lower, less conspicuous granule 

 laterad of the median tubercle of the outer row. On the median line 

 of these segments there is a small granule close to the posterior margin, 

 and on segment 2 there is also another half way to the anterior margin. 

 These segments also with two low, transverse prominences on the an- 

 terior and posterior margin between the outer row of large tubercles 

 and the keel, those on the posterior margin projecting farther beyond 

 the margin than those in front. 



Type— U.S. 'HM. no. 1107. 



Family STYLODESMIDAE 

 BOTRYDESMUS, n. gen. 



Type. — Botrydesmus lutosns, n. sp. 



Diagnosis. — This genus is rather closely related to the African 

 Napodesmus Cook but is smaller and does not have the penultimate 

 segment produced and hiding the last segment from above ; and prob- 

 ably the body is much more convex. 



Description. — Body slender, very convex ; composed of head and 

 19 segments, of which the last is not obscured from above by the 

 penultimate segment ; keels low on the sides of the body, descending 

 almost to the level of the legs (fig. 31, a) ; dorsal surface incrusted 

 with dirt ; pore formula normal. 



Head with the vertex slightly elevated above the front from a point 

 between the bases of the antennae, the surface coarsely granular, 

 depressed at middle. 



