NO. 1170. THE FAMILY GOMPHODESMWJi—COOK. 721 



Lateral carinne less than one-fourth as wide as the body cavity, 

 inserted not much above the middle of the side; marginal callus promi- 

 nent, continuous along the anterior edge as a distinct raised margin, 

 the calli of poreless carintie about half as wide as the others; anterior 

 cariuic with the margins nearly straight, the middle rounded, the others 

 with the posterior corner gradually, but not strongly, produced. 



Repugnatorial pores 13, located in distinct excavations which open 

 more nearly laterad than dorsad. 



Anterior subsegments polished and shining; transverse constriction 

 distinct, not crenulate; below the carinte minutely rugulose; secondary 

 cariuiTB obsolete. 



Penultimate segment short, its minute carinie not equaling those of 

 the eighteenth segment. 



Last segment subtriangular, distinctly truncate at apex. 



Anal valves somewhat rugulose; margins distinct, moderately promi- 

 nent, not strongly compressed; setiferous tubercles very small. 



Preanal scale broadly rounded, triangular; setiferous tubercles min- 

 ute, though distinct, exceeded considerably in size by the distinct, 

 rather blunt, apiculus. 



Sterna moderately hirsute with long hairs which are more numerous 

 along the posterior margin and on anterior segments; no distinct sternal 

 ridges; an indistinct transverse sulcus. 



The sternal process of tlie sixth segment subsemicircular, faintly 

 shouldered, and distinctly apiculate, hirsute along its edges with long 

 hairs. 



Legs of males probably slightly crassate, moderately hirsute with 

 long hairs, especially on the inferior face of the basal Joints. 



Copulatory legs (Plates LIX, figs, la-lc). 



Color of alcoholic specimen rather dark chestnut brown; marginal 

 calli and under side somewhat lighter; antenna; and distal joints of 

 the legs dark, like the dorsum. 



Length, about 24 mm.; width, with carina?, 4.2 mm.; without carime, 

 2.75 mm. ; antennjc, 3.5 mm. ; length of leg from middle segment, 3.5 mm. 



Locality. — Eavirondo, East Africa. A single male specimen in a bottle 

 with Harmodesmus iiitcns and Mychodesmus macramma. 



The lateral angle of the first segment suggests that of Gomphodesmus, 

 being evenly rounded, with no implication of a lateral side, but there is 

 a distinct difference in the wide marginal callus of Gomphodesmus which 

 occupies the whole apex of the lateral angle. In Splienodesmus the 

 angle is less pointed and the raised margin is scarcely more pronounced 

 laterally than elsewhere. 



This species presents the most pronounced dorsal sculpture yet 

 known in the present family, the upper surface of the carinas being 

 densely rugulose, while in all other cases the sculpture is much fainter 

 and more irregular in appearance, as though accidental. 

 Proc. N. M. vol. xxi 46 



