Attuhc of Xorth America. 13 



species. It is possible that morsitcuis grows larger in the western than in 

 the eastern states, as Emerton gives 8.6 mm. as the total length of the $ . 

 A period of from fourteen to fifteen days is required for the development 

 of the eggs of this species. 



PHIDIPPUS RUFUS Hentz. 



Plate I, figure 2 a. Plate II, figure 2. 



Syn.: 1845. Attus i-iifus H., Journal Boston Soc. Nat. Hist., Vol. V. 



1845. " castaneiis id., ibid., Vol. V. 



1846. Plexifpus rnfus C. K., Die Arach., XIII, p. 130. 

 1846. •• bi-vittatus id., ibid., XIII, p. 130. 



1875. Attus mfus H., Coll. Arachn. Writ., ed. by Burgess, Bos- 

 ton, p. 60. 

 1875. " castauens id., ibid., p. 55. 



1885. Phidippus ruber Keyserhng, Neue Spinnen aus Amerika, VI, 

 Verhandlungen Zoologisch — botanischen gesellschaf t, p. 7. 



$ . Total length 8.5 mm. Width of abdomen 3 mm. 



Cephalothorax: length 4.1; width, 3.4; height 3.5. 



Legs, 9.9, 7.3, 6.8, 9.3; patella and tibia of the first 4.3; patella and tibia 

 of the third 3.4; patella and tibia of the fourth 3.4; metatarsus and 

 tarsu.s of the fourth 3. 



Lateral rather more than one-half as large as middle eyes, separated from 

 these by two-thii'ds theii- own diameter. Clypeus one-fourth as high 

 as middle eyes. MaxiUte nearly parallel, enlarged at extremity, with 

 projection at outer corner, slanting within toward labium. Labium 

 a Little more than one-half as long as maxillae, contracted at tip. 

 Sternum oval, convex, nearly twice as long as wide. Anterior cox^ 

 separated by width of labium. Legs without patellary spines. 



i' . Total length 11.8 mm. Width of abdomen 4.8. 



Cephalothorax: length 5; width 3.8; height 3.7. 



Legs 9.4, 8.1, 8.4, 9.9; patella and tibia of the first 3.8; patella and tibia 

 of the third 3; patella and tibia of the fourth 3.5; metatarsus and 

 tarsus of the fourth 3.4. 



MaxiUse rounded at extremity; lal)iiuu two-thirds as long as maxilb^"; rela- 

 tive length of legs 4, 1, 3, 3. 



Coloration. $ . The cephalothorax is covered with bright yellowish-red 

 hairs, excepting the lower sides which are white; there are some 

 long black hairs in the eye region. The face, clypeus and palpi are 

 covered with white liairs; the falces are dark iridescent gi'een; the 

 mouth parts and cox* are dark reddisli brown; the sternum is black 

 with white hairs; tlie venter is black, with two longitudinal linos of 

 white hairs which converge ])ehin(l. The abdomen is covered witli 



