1901.] TBAP-BOOE SPIDEES. 209 



first pair marginal, of the second pair their own diameter from 

 the margin ; of the third pair large, remote from the margin, 

 their anterior ends narrowly separated. 



Legs as in Cteniza &c. ; the anterior pairs and palpi strongly and 

 thickly spined on the sides of the tibiae, protarsi, and tarsi ; tibia 

 of 3rd leg withont trace of superior basal excavation ; cicnvs with 

 a single or double large tooth. 



Integument of abdomen stiff, leathery, and naked, thrown into 

 numerous narrow folds forming shallow grooves and ridges, which, 

 except on the ventral area beliind the epigastric fold, run in a 

 longitudinal direction ; posterior end of abdomen truncate, and 

 forming a perfectly circular, slightly hollowed area marked with 

 radiating grooves and impressed in its lower half with three pairs 

 of deep oval sigilla, which become smaller from above downwards ; 

 beneath the inferior pair there is a single median sigilluin. 

 Marginal festoons of this area, about 71 in number, transversely 

 oblong and tufted with long hairs. Spinners set almost in a 

 transverse line, the external pair widely separated at the base 

 and obliquely converging posteriorly, their 1st and 2nd segments 

 subequal. 



This new genus and the two related Sonoran genera may be 

 briefly diagnosed as follo\A'S : — 



a. Eyes of the anterior line very widely separated, the medians 



about three diameters from the laterals ; (tibia of 3rd leg 



excavated and clypeus very long) Chorizops. 



b. Eyes of anterior line less widely separated ; the anterior 



medians less than two diameters from the laterals. 

 a}. Tibia of 3rd leg excavated above at the base, and clypeus 



short as in Facliylomcrus (sec. Simon) Cyclocosmia. 



¥. Tibia of 3rd leg not excavated above at the base, and 



clypeus long as in Bothriocyrtimi Halonoproctus. 



Halonoproctus eicketti, sp. n. (Plate XXI. figs. 1-1 d.) 



Colour : carapace, legs, and sternum mahogany-brown ; abdomen 

 deep purphsh brown, blacker on the surface of the disk. Carapace 

 almost as long as the patella, tibia, and protarsus of 1st leg, as 

 patella, tibia, protarsus, and tarsus of 2nd, as patella, tibia, and 

 tarsus of palp, very slightly longer than patella, tibia, protarsus, 

 and tarsus of 3rd, and as long as patella, tibia, and protarsus of 

 4th leg ; width of carapace equal to the length between the 

 posterior border and the front edge of the ocular tubercle. Legs : 

 1st a little longer than 4th, 2nd and 3rd about equal and shorter 

 than the palpus, which is shorter than the 1st leg by its tarsus. 

 Palpus and 1st and 2nd pairs of legs normally spined ; tibia and 

 protarsus of 2nd armed externally with about 15 spines each, the 

 tarsus with 6 ; patella and tibia of 3rd leg armed above and in 

 front with small, close-set spines, which increase in number 

 towards the distal end of the segments ; protarsus with similar 

 spines and some much larger ones intermixed, armed below with a 

 pair of apical spines ; 4th leg with patella and tibia thickly spined, 



