60 The Craspedosomatidse of North America. 



The importance of differences in tlie ninth male legs as di- 

 agnostic generic characters is evidenced by the fact that forms so 

 different as Trichopetalum and Zygonopus have these legs almost 

 undistinguishable (cf. figs. 21 and 43) even to the presence of the 

 small, more or less chitinous hunch, possibly the rudiment of a 

 claw on the lateral face, near the apex. Conotyla has a similar form 

 of ninth leg, but does not have this bunch, and differs widely in 

 other characters. These facts are suggestive of the probable im- 

 portance of the large claw on the ninth legs of Scoterpes as de- 

 scribed and figured by Dr. Packard (cf. our figure 13). 



Zygonopus \*'liitei Eyder. 



Spirosireplion copei 'Pa.cka.xii ])ro parte : Am. Nat. XV, p. 231 (1881); Proo. 

 Amer. PMlos. Soc. XXI, p. 194 (1883). 



Zygonopus xoMtei Eyder: Proc. U. S. Nat. Museum III, p. 527 (1881); 

 McNeill, Bull. No. 3, Brookville Soc. p. 9 (1888). 

 Plates I-II, figures 14-21. 



Body scarcely fusiform, slightly broadest toward the front, narrowed very 

 aliruptly on the last few posterior segments. 



Vertex with a large, shallow, transversely oval depression between the an- 

 tennae. 



Clypeus with a large transversely oval depression in the upper part. 



Antennae of moderate length, subclavate, moderately pilose. 



Lingual lobes with three sense-cones. 



Styliforni process deeply quadridentate. 



First segment longer than semi-circular, regularly rounded in front, nearly 

 straight behind, lateral corners not produced. Outer bristle directed out- 

 wardly and vipwardly, and located at the posterior corner. Second bristle 

 mesad and cephalad from the outer, and about as far from the anterior margin 

 of the segment as from the lateral bristle. Inside bristle mesad from the 

 second, and about equally distant from it and from the median line. 



Second segment shorter than the first, and with longer bristles. 



Third and subseqirent segments with rather small lateral carinse, on which 

 are located the two outer bristles, the inner one of which is somewhat anterior 

 to, and but little above the outer. The inside bristle is rather close to the 

 others, receding from the median line. All the bristles are slightly curved, 

 and the length of the longer is about two-thirds the diameter of the body. 

 Surface of the segments dorsally with irregular lougtitudinal wrinkles. Be- 

 low the carinse the sides of the body are very delicately striate, after the 

 manner of the lulidse, except that the striations are much finer and more 

 curved, especially the upper ones. These striations are very much slighter 

 than those of Pseudotremia and are much more numerous, numbering about 

 twenty. On the anterioi' portion of the subsegment they are reticulately 

 joined. All the segments, including the last, have a fine median sulcus. On 



