ART. XV.-DESCRIPTIONS OF THE ARANE^E COLLECTED IN 

 COLORADO IN 1875 BY A. S. PACKARD, JR., M. D. 



By T. Thorell, Ph. D., 



Junior Piofessor of Zoiilor/y in the University of Upsala, Sweden. 



CLASS AEACHNOIDEA. 



Order AllANE^. 



Section* ORBITELARIiE. 



Fara. EPEIROID^. 



Subfam. EPEIRIN^. 



Gen. Epeira (Walck.), 1805. 



1. U. trivittata Keyser). 



Syx. — 1864. — Epei7'a trivittata Keyser]., Beschr. neuer . . . OrbiteliO, in Sitzuugs- 

 ber. d. Isis zu Dresden, 1863, p. 95 (33), tab. v, figs. 6-9. 



Oue adult male and several young examples of both sexes were cap- 

 tured by Dr. Packard at Boulder, Colo., June 29. 



This species is probably nearly related to E. domicllionitn Hentz, but 

 it is much smaller, the full-grown female being only about 7-8 millim, 

 in length, and the male about 6 millim. It appears to be common in 

 the United States, and has perhaps been described both by Walcke- 

 uaer and Hentz, though I am unable to identify it with any of the 

 species of these authors. 



Gen. Tetragnatha Latr., 1804. 



2. T. eloiujata Walck. 



Syn.— 1841.— Tc/)vr^Hr(/7(r( elongata Walck., H. N. d. Ins. Apt., ii, p. 211. 



1350. — Tetragnatha gvallaior Hentz, Descr. and Fig. of tlie Aran, of the 



United States, in Best. Journ. Nat. Hist., \i, p. 26, pi. iv, figs. 1, 2 

 1365. — Tetragnatha grallator Keyserl., Beitr. z. Kenutn. d. Orbitelje, in 



Verbaudl. d. zool.-bot. Gesellsch. in Wieu, xv, p. 850 (52), tab. 



xxi (iv), figs. 24-27. 



As this spider is very variable, and the above synonyms not quite 

 sure, I shall here give the characteristics of the species and of its prin- 

 cipal varieties known to mo. 



* Reasonable objections liaving been made (by Gerstaeckor) against calling the prin- 

 cipal groups of the order Araneic " snl)orders", I have here adopted the more indiffer- 

 ent term "sections". 



477 



