64 The Graspedosomatidse of North America. 



on each side, springing from tubercles, the lower two being approximate and , 

 situated on the upper surface of the short lateral processes, and the third 

 higher up on the scutum. On a few of the posterior segments these bristles 

 are in a transverse row, and on the last scutum, which is broad and truncate, 

 the two inner ones are thickened at their bases. There is an impressed dorsal 

 line. Legs slender, white, hairy, with the penultimate joint lengthened. 

 The under side of the seventh segment of the male is furnished anteriorly 

 ■with a pair of appendages directed backward and curved upward, and pos- 

 teriorly with a pair of cylindrical jointed organs, directed horizontally out- 

 ward, tipped Avith a short bristle, and appearing like modified legs of the pos- 

 terior subsegment. In crawling these organs have a motion similar to that of 

 the basal joints of the adjacent legs. Length 6 mm. 



"This species is not uncommon iinder or among decaying leaves in moist 

 woods about New Haven. ' ' 



We have copied above the original description of this species, 

 although a large part of it consists in an enumeration of charac- 

 ters common to all Craspedosomatidse, and nothing diagnostic of 

 a species is mentioned, with the possible exception of the form of 

 the ninth legs of the male. The accompanying diagram of the 

 genitalia and ninth legs, we reproduce (plate III, fig. 54). If cor- 

 rectl}^ drawn hy Harger, it certainly represents a species not seen 

 by us, as a comparison with our diagrams of corresponding parts 

 will show. 



Tricliopetaluni allium sp. n. 



Plates II-III, figs. 22-29, 36-45. 



Eyes in a lunate patch; the ocelli counted from the exterior edge show the 

 following arrangement: 4+2+2+1+1=10, or 4+2+2+2+1=11. 



Antennse somewhat clavate, .7-.8 mm. long, the fifth joint thickest, .12 

 mm. in diameter; approximate ratios of length of joints 3: 5: 10-11: 5.5: 10: 5: 3. 



Lingual lobes with three sense-cones. 



First segment broadly reniform, with rather pointed ends, not twice as 

 broad as long (5:3), with three setigerous tubercles on each side, one near the 

 posterior angle ; the second cephalad, and somewhat mesad of the first, near 

 the anterior margin of the segment ; the third about midway between the first 

 and the median line, and situated in a large shallow depression. A delicate 

 raised anterior margin. Posteriorly the segment is broadly emarginate. 

 A delicate median line begins in front of the middle and extends to the poste- 

 rior margin. Surface smooth and shining, or faintly areolate. 



Subsequent segments with the lateral carinse gradually increasing in size to 

 about the middle of the body, and then decreasing so that the posterior seg- 

 ments have no distinct carinse. The second pair of bristles are gi'adually 

 placed more directly mesad from the outer pair, and on the terminal segments 

 the six bristles are arranged in a straight transverse line. The anterior seg- 



