528 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



second joint of mandibles nearly 1^; of palpi 3^ millim. Legs: I 

 15f (thigh slightly more than 3J), II 27, III 16|, IV 20 millim. 



In young specimens, the upper part of the body is smooth, not granu- 

 late, and the eye-eminence, frontal tubercles, and legs also smooth, 

 destitute of spines or teeth. 



The collection contains several examples of this curious species, cap- 

 tured partly in Idaho, July 5, partly under stones on Gray's Peak, Colo- 

 rado, a little below the summit, July 7. 



ADDENDUM. 



Desceiptions of Two New Spiders from Colorado. 



By James H. Emerton. 



(Figs. 18, 19.) 



Epeira aculeata, n. sp. 



Length 7™™. Cephalothorax brown at the 

 sides, light yellow on the head, covered with 

 whitish hairs. Middle eyes nearly forming a 

 square, the anterior a little farther apart than 

 the upper, and with narrower rings around 

 riG. is-npevra acuUata,T:m. ^^^^ 5 ^^^ ^out lateral eyes half their diameter 

 erton, n. sp., $ . higher than the middle. 



Abdomen IJ times as long as wide, extending forward over the thorax 

 as far as the dorsal groove, and backward a little beyond the spinnerets, 

 marked with a row of triangular light yellow spots, the second widest, 

 and with curved sides. In the center of these light marks, a light red- 

 dish-brown band. Sternum dark brown, mandibles light yellow with 

 dark brown tips. Abdomen beneath, with a central straight band and 

 two lateral bauds curved forward in front of the spinnerets, yellow. 



Legs yellow, with a reddish-brown ring around the middle of each 

 tibia and metatarsus, and at the end of every joint. Upper side of the 

 femora of the first and second pairs reddish-brown. 



Epigynum with a curved and sharp-pointed hook, narrower and not so 

 sharp as in U. ceropygia, but not so narrow as in U. pacTcardi, light yellow- 

 brown, and covered half its length on the outer side with stiff hairs. 



One 2 from Gray's Peak. It resembles U. cerojrygia except in the 

 epigynum. 



Drassus coloradensis, n. sp. 



Length 10™"^; leg of fourth pair 15™™. Colors probably light yellow 

 on the cephalothorax and legs and gray on the abdomen. Legs of 

 first pair longer than those of the fourth. Tibiae of first and second j)airs 

 with only one spine beneath. Palpi as long as femur and half the patella 



