420 The Arachnida of Colorado. 



Micaria coloradensis Bks. 



Fort Collins, on luwn (Mrs. Baker). 



Drassus coloradensis Em. 



Described from Gray's Peak. 



Drassus humilis Bks. 



West Cliff (Cockerell). , 



Drassus robustus Em. 



Ft. Collins, under stones, Nov., Dec. (Baker). 



Drassus inomatus iiov. sp. 



Length 9 l'^ miu- ; ceph. 3.9 mm. long, 2.9 mm. wide; patella plus tibia 

 IV. 4.1 mm. Ceplialothorax pale reddish-ljrown ; legs and palpi j-ellow- 

 browu, darker on metatarsi and tarsi ; mandibles dark red-brown ; sternum 

 paler red-brown, darker on edges; abdomen above andljelow light gray, darker 

 near the tip ; spinnerets yellowish. Legs moderatelj- hairy, no spines above 

 on any of the tibiae, one below on tibia I.; metatarsi (except IV.) and tarsi 

 with not very dense scopulas ; fourth pair of legs quite long, the anterior 

 pairs very short. Sternum narrow, nearly twice as long as In'oad. Posterior 

 row of eyes procurved, longer than the anterior row ; P. M. E. oval, 

 more than their diameter apart, slightly nearer to each other than to P. S. E. ; 

 anterior row straight, A. M. E. the larger and nearer to the A. S. E. than to 

 each other. The epigynum consists of a quadrangular cavity, broader l)ehiud 

 than in front, from the anterior margin of which there projects a plate becom- 

 ing quite wide, then tapering to a point near the posterior margin of the cavity. 



One specimen, West Cliff. ( Cockerell j. 



Drassus assimilis nov. sp. 



Length $ 9.Q m. m. ; ceph, 4 m. m. long; 3 m. m. wide: patella plus tibia 

 I. 6.2 m. m. Cephalothorax, legs and palpi yellowish ; sternum yellow-brown, 

 darker on edges; palpal organ reddish; abdomen dark gray: spinnerets yellow- 

 ish. Tlie eyes are similar to D. inomatus. Sternum broad. Legs very long 

 and slender; the scopulas moderately thick on the tarsi, but only on the tips 

 of the metatarsi; no spine under tibia I., none above on tibia III., tibia IV. 

 missing, femur IV. is a little shorter than femur I. Tlie palpus has some re- 

 semblance to D. coloradensis, but the pointed projection on tibia is not so large, 

 the tube of palpal organ is very much more curved, and, instead of a pointed 

 tooth, there is a prominent foot-shaped appendage projecting beyond the side 

 of tarsus. The sternum is too broad and the first legs too long to be the ^ of 

 D. inomatus. 



Fort Collins (Gillette). 



Prosthesima atra Hentz. 



Fort Collins; under stones and leaves; sweeping alfalfo, May, 

 Nov. Thorell records it from Manitou, July. 

 Prosthesima ecclesiastica Hentz. 



Fort Collins (Gillette). 



