1895. TROCEEDINGS OF THE NATIONAL MUSEUM. 91 



Male genitalia noticeably broader than in A. oxygonns, on the inner 

 niar^^in near the base, more rounded, and hence ai)i)earin<4- to be more 

 nearly approximate. 



Color of alcoholic specimen dirty testaceous yellow, the lateral ridges 

 of the carinie lighter and clearer yellow, and with the anterior and 

 l)osterior margins brown. Margins on the median portion of the seg- 

 ments, antenmt, and legs more ferruginous. 



Length, 78 mm,-, width, 12.\mm. 



Locality. — A single male specimen from Mombassa. 



'■'l^eav Uurydesnius oxygonusj Peters, but noticeably larger and dis- 

 tinct on account of the posterior margins of the three first segments 

 without fold-like thi(;kenings; the first segment with the posterior mar- 

 gin decurved cephalad on the sides; the much smaller marginal ridges 

 on the carinai of the second segment, the longer and more pointedly 

 attenuate carinte of the three segments before the last, the sj)arsely 

 and finely granulated basal Joints of the posterior pairs of legs, etc." 



Karsch's drawing of the genitalia of this species bears considerable 

 resemblance to Astrodesmus stelUfer. If there is really a process on the 

 sternum of the seventeenth segment ("des viertletzten Beinpaares"), 

 it would probably be necessary to establish another genus. 



AULODESMUS COMPACTILIS (Gerstackerj. 



Euriidc^mus compactUis, Gv.UfiTxcKFAi, Uccken's Reise, p. 519, 1873. 



Body short and stout, i)roportionally strongly arched, slightly 

 shining. 



Vertex with a fine, though sharp, median furrow; clypeus below 

 more strongly contracted than in A. laxu.^, the curved line above the 

 middle of the margin distinct, the part below densely punctate. 



Antenuie somewhat more slender than in A. laxus. 



First segment with anterior margin even, moderately arcuate, pass- 

 ing with the same curve into the lateral margins; posterior edge 

 emarginate in the middle, and also on each side, so that the lateral 

 corners are sharp and slightly produced caudad; marginal ridges 

 smooth, linear, continued on the anterior margin and gradually nar- 

 rowed. 



Subsequent segments strongly arched dorsally. Second to fourth 

 segments with an evident emargination on each side of the posterior 



Lateral carinfe small, below the middle height of the segments; on 

 the anterior segments scarcely evident, but more pronounced from the 

 fifth back, slightly arched, the ])osterior edge slightly more elevated. 

 ]\Iarginal ridges of segments 2-4, also of and 8, linear, more pronounced 

 than on the first segment. Carina' gradually larger from segment 10; 

 fronj 14 with evident tooth-like i)rojections beyond the posterior mar- 

 gin. Projection of segment 18 smaller than that of 17, that of 19 small, 

 bhint-papilliform. 



