500 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



tated in their outer margin; the space between these bands is whitish. 

 On each side of the abdomen, at its fore extremity, just beneath the 

 "whitish band which surrounds the back, is a short, longitudinal reddish - 

 brown line ; the sides have, moreover, behind and more downward, a 

 row of small, irregular, reddish-brown spots. The under part of the 

 abdomen is whitish-gray, with two brownish-red points at the rima geni- 

 talis. The mamillm are whitish-gray, the inferior pair with a brownish- 

 red spot at the base. 



Length of body 2f, length and breadth of cephalothorax 1^ millim.; 

 length of abdomen If, breadth of same somewhat more than 1 millim. 

 Length of legs II 7, of legs III 3 millim ; pat. + tibia II a little more 

 than 2J, pat. -f tibia lY 1 millim. 



The collection includes a single very damaged male specimen of this 

 fine little spider, captured at American Fork Oaiion, Utah, July 22. 

 The female differs probably much both in form and color from the male. 



Gen. MisuMENA (Latr.), 1804. 



16. M. vatia (Clerck). 



Syn. — 1757. — Araneus vatius Clerck, Sveuska SpindL, p. 128, pi. 6, tab. 5. 

 1758. — Aranea calycina Liuu., Syst. Nat., ed. 10, i, p. 620. 

 1778. — Aranea citrea De Geer, M^m., vii, p. 298, pi 18, figs. 17-22 

 1848. — Thomisus fartus Hentz, Djjscr. aad Fig. of the Aran, of the U. S., 



c, V, p. 445, pi. xxiii, fig. 4. 

 1872. — Misumena vatia Thor., Rem. on Syn., 3, p. 258. 



Of this widely spread species, the collection contains three female ex- 

 amples, captured at Lawrence, Kans., Boulder, Colo., and G-olden, Colo., 

 {" Foot-hills entrance in Clear Creek Caiion "), June 25 to July 13. Thorn, 

 aleatorius Hentz (1. c, p. 444, pi. xxiii, fig. 2) is perhaps the male of this 

 species, and Th. celer id. (1. c, p. 446, pi. xxiii, fig. 5) a v^ariety of the 

 female. 



Subfain. PHILODROMINI. 



Gen. Philodromus (Walck.), 1820-26. 



17. Ph. aureolus Clerck. 



Syn. — 17.57. — Araneus aureolus Clerck, Sveuska SpindL, p. 133, pi. 6, tab. 9. 

 1872, — Philodromus aureolus Thor., Rem. on Syn., 3, p. 264. 



A male of this in Europe common species was captured at the Great 

 Salt Lake, Utah, July 27, and a female at Manitou, Colo., July 16; both 

 examples are full-grown. 



18. Fh. virescens n. 



Pale whitish or yellowish-green, the cephalothorax brownish or violet 

 on the sides; joints of legs slightly violet at the apex; abdomen with a 

 pale violet band along each side, and two short parallel violet lines above 

 the anus; second pair of legs the longest, third and fourth pairs of very 

 nearly the same length ; eyes of the front row of the same size, hind 

 lateral eyes slightly larger than hind centrals ; area of the central eyes 



