The Graspedosomatidae of North America. '11 



generic relatives. We have little faith in the homologies of these 

 structures suggested by European writers, for though in some 

 special cases they may sometimes appear reasonable, a general 

 application is not evident. In dissecting C. fischeri we found that 

 the posterior pair of genital processes alwaj's remained attached 

 to the ninth pair of legs, while the anterior pair remained in the 

 body, and on account of their small size were at first overlooked. 

 An examination of other species showed in each the two pairs of 

 structures, though the anterior is much reduced, and perhaps func- 

 tionless. The posterior pair of genitalia maj^ perhaps be homolo- 

 gous to the larger of the plumose processes of Trichopetalum. 



This genus much resembles in characters of form, carinse and 

 spines the three genera Zygonopus, Scoterpes and Trichopetalum. 

 From the first two of these it is distinct in the possession of well- 

 developed eyes, and from the last in having 30 segments. 



The spines of the pectinate lamellae are sometimes bifid at the 

 tip, especially in the middle rows. 



In this genus the ba^^onet-like spines of the last joint are found 

 on all or nearly all the male legs, becoming fewer and smaller on 

 the posterior legs. 



In describing the species of this genus we have made frequent 

 comparisons with Gonotyla fischeri, the type of the genus, a new 

 species of which we have abundant material and are hence able 

 to describe more thoroughly than the other species. 



Conotyla lisclieri sp. n. 



Plates IV-V, figures 55-78. 



Eyes prominent, broadly triangular, the ocelli arranged in four rows, 2 1-4 

 -f6-|-7=19, the short rows being towards the antenna;. The direction of the 

 rows is oblique to the posterior margin of the vertex, and diverging mesad. 



Antennse filiform, 2.8 to 3.2 mm. long, .14 to .16 mm. thick; approximate 

 ratio of lengths of joints beginning with the seventh, 2.5: 4: 8: 7:10: 5: 1.5. 



First segment viewed from above semicircular-reniform ; a fine ridge, or 

 rather row of minute, bead-like protuberances; a small plane or slightly de- 

 pressed area on each side of the median line near the centre of the surface of 

 the segment; on each side the customary three bristles and accompanying 

 prominences, the outer and larger bristle being usually directed horizontally 

 outward and located on the small carina or lateral corner of the segment. 

 Second bristle much smaller, located a little mesad and cephalad of the other, 

 near the margin of the segment; third bristle about midway between the sec- 

 ond and the median line, and directly mesad from the first bristle. 



