chamberlin: the arachnida. 275 



(four fifths) apart, their diameter from the laterals. Lateral eyes on 

 each side equal, their radius apart. Anterior row of eyes recurved; 

 medians smaller than the laterals (diameters as 4.5: 6), one third their 

 diameter apart, closer to the laterals. Clypeus very narrow, about 

 one third the diameter of an anterior median eye wide. Area of 

 median ej'es nearly equal in length and breadth; wider behind than 

 in front in ratio 2:3, (Plate 21, fig. 8). 



Sternimi widest back of middle, much narrowed cephalad; more 

 abruptly narrowed caudad, the caudal angle not very acute; wider 

 than long in ratio 15:13, (Plate 21, fig. 6). 



Anterior tibiae flattened dorsoventrally, apparently wholly un- 

 spined; anterior metatarsi with a pair of very short spines beneath. 

 Posterior tibiae and metatarsi with spines as usual. 



Furrow of posterior spiracle situated at about one third the distance 

 from the genital furrow to the spinnerets. 



Length of female, 4.1 mm. Length of cephalo thorax, 1.7 mm.; 

 width, 1.2 mm. 



Locality.— San Miguel, 6,000 feet, July. (Type, M. C. Z. 262, 

 one female not fully mature). 



Trachelopachys bicolor, sp. nov. 

 Plate 21, fig. 9-10. 



Cephalothorax with chelicerae, labium and endites, and the entire 

 abdomen solid black or the abdomen above with very vague chevron- 

 lines caudad. Spinnerets yellowish. Legs clear yellow, the scopulae 

 giving them a dusky appearance at distal ends. 



Posterior row of eyes recurved in such degree that a line tangent 

 to caudal edges of medians cuts through the anterior fourth of the 

 laterals; median eyes a little smaller than the laterals, twice their 

 diameter apart, farther from the laterals. Anterior row of eyes a 

 little procurved; laterals much larger than the medians (diameters 

 about as 3:2); median eyes their diameter apart, about half as 

 far from the laterals. Clypeus twice as wide as diameter of median 

 eye. Area of median eyes equal in length to width behind; wider 

 behind than in front in ratio 7 : 6. 



Sternum longer than wide in a little less than the ratio 4:3; strongly 

 convex, the borders being much above (dorsad of) level of median 

 portion. 



