The Craspedosomatidse of North America. 65 



ments are broadly emarginate posteriorly. Posterior dorsal part of segment 

 smoother than the anterior, and divided from it by a more or less definite 

 transverse gently curved line. In front of this line the surface is finely areo- 

 late, behind it smooth and shining, with a few faint, usually longitudinal lines 

 dividing it into larger areolations. A very fine median ridge, located in a 

 nearly obsolete furrow. Below the lateral carina the posterior subsegment is 

 longitudianally striate. 



Anal segment short, broadly truncate, laterally broadly sinuate; medianly 

 the margin of the truncation is slightly produced, giving a convex edge between 

 the thickened papilliform bases of two long, exceedingly fine hairs which are, 

 bases included, three times as long as the exposed part of the anal segment. 

 At the ends of the truncation are two slender bristles, and one farther down 

 on the sinuation. Two small bristle-bearing tubercles on anterior part of the 

 segment close to the median line. 



Anal valves smooth, not strongly convex, more prominent above the middle, 

 and with a rounded angle, faintly margined; near the margin on each side 

 three slender bristles, one close to the. superior edge of the valves, the second 

 near the angle, the third about half-way from the angle to the edge of the pre- 

 anal scale. 



Preanal scale semi-elliptical, posteriorly truncate ; two tubercles with long 

 posteriorly directed setae, near the posterior margin ; surface smooth. 



Male genitalia (figs. 36-43) simple, consisting of a pair of more or less 

 arcuate, basally and laterally hirsute structures, behind which are two pairs 

 of laciniate processes. The apices of the genitalia of different specimens appear 

 to vary considerably, but in all cases the end is somewhat broadened and 

 emarginate, so as to leave the corners more or less i^roduced, as shown in fig- 

 ure 36. The apical portion is flattened and very thin and the different ways 

 it may be bent and the different angles at which it is consequently viewed 

 VFill largely explain the apparent variation. The form shown in figure 41 is 

 nearly or quite the same as the others, the apparent difference being cansed by 

 the fact that one of the corners is invisible on account of perspective, while 

 the other is recurved. 



Ninth legs of male oblong-clavate, with a few scattered hairs. 



Color white, sometimes reticulately mottled with light horn-brown. Tlie 

 exo-skeleton is so transparent that the contents of the alimentary canal, if 

 dark-colored, show through as a dark median line. 



Length 6 mm. ; mdth .6 mm. 



Habitat: Common in moist, wooded localities in central New 

 York and western Ontario. We have examined about 200 indi- 

 viduals collected at Onativia, Marcellus, Syracuse, Pratt's Falls 

 and Kirkville, New York; also at Orillia, Ontario, and Chief 

 Island, Lake Couchiching. 



On the anterior segments the setigerous tubercles are little 



Annals N. Y. Acad. Sol, IX, Oct., 1895.— 5 



