igo8] Araneae The raphosae of California 221 



metatarsi II with two or three apical spines and three or four 

 others on the basal half, varying as to position. Patella III with 

 a more or less triangular patch of from 10 to 18 stout spines, as 

 in the next species. Tarsi IV unarmed in one specimen, in the 

 other, each with four spines. 



The specimens were taken from their nests, which were in 

 sandy banks along furrows cut in the hillside during heavy rains. 

 The burrows were short, but of large diameter, measuring only 

 13 and 15 cm. long respectively, and varying from 18 to 25 mm. 

 in diameter; much enlarged externally, but the silk tube itself 

 contracting somewhat, the space thus left between the heavy 

 silk tube and the solid soil being filled with loosely mixed sand 

 and silk, this mass being readily pulled out with the trapdoor, etc. 

 In one case the surrounding soil had washed away considerably, 

 leaving the mass of silk and sand protruding some 15 mm. from 

 the bank. Near the center of the external surface of this mass, 

 which had a more or less laminated appearance, was the rather 

 thick trapdoor, of sand and silk, measuring about 20 x 15 mm. 



Aptostichus stanfordianus sp. nov. 



(Plate XIII, figs. 20-31 ; XIV, figs. 17-29; XVI, figs. 4-5.) 



Adtilt 9 (Plate XVI, figs. 4-5) — Measurements from my largest specimen, 

 No. 137: length 21 mm.; cephlx. 9 mm. long, 7.5 mm. wide; abdomen 11 mm. 

 long. Cephalothorax tawny, slightly or decidedly olive-tinted, darker along 

 furrows bounding caput; apparently glabrous, the scattered pale tawny minute 

 hairs noticeable only under a good lens; posterior margin nearly straight or 

 somewhat emarginate; a row of pale colored cephalad-bent setae along median 

 line of caput; caput medium in convexity, the caudal-converging sides forming 

 nearly straight lines (Plate XIII ,figs. 25 and 28) ; eye-tuber nearly black, about 

 half as high as long (Plate XIV, figs. 22-24) ; eyes as in Amblyocarenium, variable 

 (Plate XIV, figs.. 19-21) A. E. blue-gray, P.'L. yellowish-white, P. M. opaque- 

 white, conspicuously luminous. Chelicerae darker than cephalothorax, with 

 alternating glabrous and setose areas above, the setose lines fusing near the 

 apex, apex merely rounded; rake of inany teeth (Plate XIII, figs. 20-21), 

 extending well up the inner edge above; fang smooth and rounded on inner 

 edge. Abdomen oblong to elliptic; yellowish-brown, marked above with a 

 median series of dark brown blotches, larger cephalad, and latei-al series of ceph- 

 alad-convergmg short linear spots, with various less definite spottings in be- 

 tween — the basis of these spots being rings of pigment, distinct in the lightlv- 

 marked specimens, but confluent and more-or-less obsolete, as rings, in the heav- 

 ily-pigmented individuals (Plate XIII, figs. 26-27). Spinnerets four, the su- 

 perior pair as shown in the last mentioned figures. Sterntnn tawny, decidedly 

 olivaceous in the darker specimens, black-setose; six impressions, the anterior 

 pair not apparent in inany individuals, btit readily seen in sterni dissected out 

 and mounted in balsam, posterior pair mediuin in size, elongate elliptical to 

 nearly roimd, almost as close to each other as to the margin (in adults) or much 

 nearer the margin than to each other (in young individuals) (Plate XIII, figs. 

 29-31), darker in color than the rest of the sternum, probably because of thicker 

 walls to the epithelial cells at these spots, as seen tmder the compound micro- 

 scope. Labium wider than long, emarginate in front, with three to ten spinules, 

 in a well defined transverse row or scattered (Plate XIII, figs. 22-24). Coxae 



