24 The Craspedosomatidse of North America. 



Anteuna; filiform or sub-clavate, moderately pilose, the hairs increasing in 

 length and number on the distal joints. Seventh joint of antennae with a 

 conic-mamillate sense-organ tipped with a long fine hair. Mandibulary stipe 

 with the exposed surface smooth, more or less hirsute with short hairs. 



Hypostoma apparently not a part of the gnathochilarium, in the sense of 

 having any intimate connection with that structure. In all the species ex- 

 amined it appears as a chitinized ridge aroiind the ventral side of the slender 

 neck of the animal.* 



The stipes of the gnathochilarium are produced posteriorly far beyond the 

 menturn and embrace the sides of the neck, which lies in the sinus thus 

 formed behind (above) the mentum. 



First segment semi-circular to broadly reniform in front; nearly straight 

 behind, except for a broad, shallow emargination in the middle; anterior mar- 

 gin and lateral angles with a fine raised edge; three setse on each side; sur- 

 face smooth. 



Subsequent segment? with three setse on each side, one close to the pos- 

 terior angle of the lateral carina, the second slightly farther from the anterior 

 angle, the third about midway from the carina to the median line. On pos- 

 terior segments the arrangement tends toward a straight transverse line, and 

 the setae are longer than on anterior segments. Beginning at the middle of the 

 first segment and ending on the penultimate segment is a fine longitudinal 

 sulcus, or rather a pair of sulci with a A'ery fine raised line between (not ap- 

 parent in Branneria). The surface of the segments, when not otherwise 

 roughened, is finely reticulate, the pattern of the reticulation varying on dif- 

 ferent species and different parts of the body. When carinse and tubercles 

 are present the exo-skeletou is scarcely thickened, the body cavity extending 

 out into all prominences. 



Supplementary margin not evident. 



Anal segment without median furrow, truncate behind or with a broad 

 shallow emargination ; broadly sinuate on the sides. On this segment there 

 are eight setigerous tubercles, two located near the middle of the dorsal sur- 

 face of the segment, the other six near the posterior margin, one on each side 

 by the sinuation, one at each corner of the emargination, and two near the 

 median line, these last with thickened, conic or papilliform bases. 



Anal valves not strongly convex, more jirominent above the middle, each 

 with three setae close to the margin. 



Preanal scale semi-elliptical, broader than long, broadly truncate posteri- 

 orly, with two long bristles directed backward. 



Pedigerous laminae medianly produced into a conic process which lies be- 

 tween the approximated coxae, and has its anterior face exposed. This ex- 



* Judging from the present family it would not be an antecedently improb- 

 able theory to regard the hypostoma as the ventral part of the first segment. In 

 that case it would not be necessary to consider the third segment footless, but 

 to suppose that the ventral plates of the second and third segments have been 

 crowded somewhat ahead. This also accords with the opinion of Heathcote, 

 the result of a study of the embryology of lulus. 



