The Craspedosomatidae of North America. SY 



tubercles being confined to the sides of the dorsal surface; tubercles become 

 more numerous caudad to about the twentieth segment, where they begin to 

 be gradually obliterated, so that the last few segments are nearly smooth. On 

 the other hand, the bristle-bearing tubercles become larger and the bristles 

 longer on the posterior segments. The tubercles, especially the lateral, are 

 conical or papiliform, and tipped, especially the lateral and posterior ones, 

 with a very short seta. The circular, light-colored bases of the other clavate 

 or long setiB distinguish them at once from ordinary tubercles. On posterior 

 segments the six bristle-bearing protuberances become more and more arranged 

 in a straight transverse row. The fine median ridge located in a shallow fur- 

 row is continued from the first segment to the penultimate. 



In males the sixth and seventh segments are noticeably larger than the 

 others, being both longer and broader. 



Anal segment with surface smooth, very slightly hirsute with short hairs. 

 Posterior margin deflexed, squarely notched in the middle, deeply sinuate on 

 the sides. On each angle of the emargination is a setigerous tubercle. 



Anal valves margined, slightly rugulose, the ridges running oblique to the 

 ^nal oj)ening, three setigerous tiibercles at intervals, near the inner margins 

 of the valves. 



First pair of legs of male six-jointed, the joints, beginning with the coxa, 

 resj)ectively, .20, .06, .50, .20, .16, and .60 mm. long; width of third joint .14 

 mm. The joints are not specially modified, nor roughened except by sparse 

 hairs. Two small superior secondary claws. 



Second legs of male also six-jointed, the joints, excepting coxa, measuring 

 .08, .50, .22, .16, and .60 mm. long; third joint .16 mm. wide. 



Third legs of male seven-jointed, as are all the others (except the ninth), 

 joints measuring .30, .08, .40, .60, .26, .20 and .64 mm. in length; width of 

 first joint .40 mm. The seventh joint has the distal part of the inferior sur- 

 face beset with fine bayonet-like processes, as described for Conofyla fischeri. 

 Two small superior secondary claws. 



Fourth legs of male with joints .34, .06, .40 .60, .26, .20 and .60 mm. long; 

 width of first joint .34 mm.; seventh joint as on third legs. Two superior 

 secondary claws. 



Fifth legs of male with joints .34, .06, .60 .74, .34, 20 and .66 mm. long; 

 first joint .34 mm. wide; otherwise as for third legs. 



Sixth legs of male with joints .40, .06, .54, .72, .30, .20, and .64 mm. long; 

 first joint .30 mm. wide. 



Seventh legs of male with joints .40, .06, .56, .74, .30, .20 and .68 mm. long; 

 width of first joint .30 mm. Inferior surface of coxa covered with small 

 rounded knobs. Otherwise as for third legs. 



Male genitalia (plate I, figs. 2 and 3) very complex, consisting of four 

 different structures: 



1. An irregular, deeply bifid lamina (fig. 2) broad at base, the lobes 

 crossed by a very prominent, rounded, diagonal elevation, projecting mesad. be- 

 yond which they are narrowed to bidentate apex, the teeth diverging, one 

 curved laterad, the other caudad. A side view (fig. 3) shows that the mesal 

 edge of the inner tooth is continuous with a broad subvertical lamina. 



