NO. 1170. THE FA MIL Y G OMPHO DESMIDJE—COOK. 731 



ASTRODESMUS ROBUSTUS, new species. 

 (Phite LX, fi},'. 2a.) 



With general habit of A. stellifer, but distinctly more robust, and 

 less convex tlian any of the other 8])ocios. TIk' carina* al.so fit very 

 closely to^etlier, and assist in giving the animal a somcwliat cliaracter- 

 istic appearance. 



The copulatory U'gs resemble those of A. Inxnn, and differ from those 

 of A. stellifer iu tiiat the riagellum lacks the retrorse snbapical si)iue 

 and lainelhir expansion. 



Color like some of the browner specimens of tV. stelli/er. 



Length of male, 55 mm.; width, 14.5 mm. 



Loraiitj/. — I'^ast Africa, probably Irom the German (tolony; but more 

 particular data are not at hand, and the type specimen of the Berlin 

 Museum is not now accessible. 



ASTRODESMUS LAXUS (Gerstacker). 



(Plato LXI, figH. la-hl.) 



Eurydesmus laxus GerstXckkk, Decken's Reise, 1873, III, 2, p. .518. 

 AulodenrnHH laxus Cook, IVoc. IJ. 8. Nat. Mus., 1895, XVIII, pp. 90, 91. 



Vertex hairless and smooth, the sulcus very shallow. 



Clypeus smooth and even, excepting an obli({ue depression on each 

 side, and a few coarse ])nnctations below. 



Antenna; with basal joints very sparsely hairy, the distal gradually 

 more hirsute. 



Segments dorsally smooth and even, finely rugulose on the carina*. 



Lateral carina* with the anterior and posterior margins moderately 

 pronounced, the marginal calli distinctly and more abruptly broader 

 on anterior segments, and the posterior corners moderately produced. 



Kepugnatorial pores in broad, shallow depressions, ({uite different 

 from the smaller and distinctly deeper ones of A. stellifer. 



Segment 18 much more exposed than in the other species of the 

 genus. This character is shared by the other posterior segments, so 

 that the body appears to tai)er more gradually caiidad; carina; are of 

 the usual size, but project considerably beyond those of segment 18. 



Last segment with projecting i)ortion distinctly narrow, rather 

 broadly trun(;ate, sei)arated by a transverse sulcus. 



Sterna densely hirsute on the posterior slo[)es of the not very strongly 

 pronounced transverse ridges; j)rocess of sixth segment moderately 

 hirsute lateially and upon its posterior face. 



Legs of male moderately crassate and hirsute, both of these charac- 

 ters being more pronounced on the anterior. 



Copulatory legs (Plate LXI, figs, la, Ih). 



Length, about 02 mm.; width, 12.3 mm.; length of antenna, 0.5 mm.; 

 of leg from middle segment, 12 mm. 



