NO. 1170. THE FAMILY GOMPHODESMIDJE— COOK. 729 



ASTRODESMUS STELLIFER Cook. 

 (Plate LX, figH. la-1/..) 



Astrodeemua stcUifer Coom, Pn»c. U. S. Niit. Miis., IHi^), XVIII, p. 8(5, pi. ii, (ifrs. 1-2; 

 pi. HI, figs. 1-9. 



Vertex without hairs, polished aiul shininjif; sulcus distinct, meetiug 

 a transverse shallow sulcus (and suture) between the autennal sockets. 



(Jlypeus smooth, even, excei)tini;' an oblique depression on each side 

 and a few coarse i)unctatious below. 



Antenuio with basal joints very sjjarsely hairy, the distal gradually 

 morti hirsute. 



Mentuni hirsute over the posterior two-thirds of its surface. 



Stipes densely hirsute, a broad depression along' the lateral edge. 



Lingual laininie very densely hirsute over their entire surface. 



Segments dorsally apparently smooth, siiining with a dull luster; 

 uniformly covered with minute, irregular, indistinct, impressed lines 

 and wrinkles, and very minutely and densely punctate. Posterior mar- 

 gins of all the segments more or less rough with line longitudinal 

 notches or very short wrinkles. 



Anterior segments with the posterior subsegments slightly convex 

 anteriorly in the middle; broadly emarginate on each side of the con- 

 vexity. 



Lateral carina' about one-fourth as wide as the body cavity; margin 

 abruptly raised and thickened above, the edge entire, blunt; anterior 

 and i)()sterior edges of carina' with a distinct, though line, raised mar- 

 gin, wiiich does not extend across the segments. Anterior carina' later- 

 ally curved slightly forward, the posterior corners at first right angles, 

 gradually mcu^e produced, until on posterior segments the rounded pro- 

 jection is more than half as long as the ])osterior subsegment. On i)os- 

 terior segments the raised margin is gradually broader, until on the 

 penultimate it occupies the entire carina. 



Lelow the carina' the segments are densely rugulose with fine, tlexu- 

 ous wrinkles; a small, snbtuberculate, indistinct carirui just above the 

 insertion of the legs. 



Anterior subsegments shining, very indistinctly marked with longi- 

 tudiiuil impressed lines. 



Last segment very short, triangular, the apex narrow, truncate, 

 slightly rounded; superior lateral tubercle somewhat above the level 

 of the carina of the nineteenth, the inferior somewhat below; the inte- 

 rior tubercle near the sinuation, the posterior about halfway between 

 the anterior and the apex. The dorsal bristles close to the margin; 

 apical piliferous i)unctations rather (ilose together, the subapical some- 

 what farther apart; apex of segment thick. 



Anal valves moderately inflated, with compressed, elevated margins; 

 rugulose, especially in the depressions. 



Preanal scale with surface nearly smooth. 



