18 Wisconsin Academy of Sciences, Arts and Letters. 



Syn.: 1847. Attus morsitans Walck., Hist. Nat. des Insectes Apteres, IV, 

 p. 419. 



1875. Attus audax Hentz, Coll. Arachn. Writings ed. by Bur- 

 gess, Boston, p. 50. 



1875. " ?r^pMncfa^^^s id. , ibid. , J). 58. 



1883. " " Peckham, Descr. new or little known, 



Attid£e, p. 33. 



$ . Total lengtli 11 mm. Width of abdomen 4.3 mm. 



Cephalothorax: length 5.3; width 5.1; height 2.8. Legs: 11, 9.1, 9.1, 10.7; 

 patella and tibia of the first, 5.5; patella and tibia of the third, 3.2; 

 patella and tibia of the fourth, 4; metatarsus and tarsus of the fourth, 4. 



Lateral separated from middle eyes by | their diameter. Clypeus i as 

 high as large as middle eyes. Maxillae slightly diverging, wide at 

 extremity, with a projection at the outer corner, inner margin slant- 

 ing toward labium. Labium i as long as maxillae, contracted and 

 rounded at tip. Sternum convex, oval. Anterior coxee separated by 

 width of labium. 

 $ . Total length 15 mm. Width of abdomen 5.6 mm. 



Cephalothorax: length 5.5; width 4.4; height 2.2. 



Legs 10.6, 9, 9, 12.1; patella and tibia of the first, 4.2; patella and tibia of 

 the third, 2.4; patella and tibia of the fourth, 3.2; metatarsus and 

 tarsus of the fourth, 3.2. 



Eelative length of legs 4, 1, 2, 3. 



Coloration. $ . $ . Cephalothorax black, covered with short black and 

 gray hairs, and having some long black hairs on the sides near the 

 small median eyes; there are sometimes white bands on the sides. 

 ClyiDeus covered with white hairs. Femur of palpus reddish, with a 

 black band on inner side, three black spines, and some black and white 

 hairs. The falces are bright iridescent green, with reddish fangs. 

 The sternum and venter are black, the venter having two whitish lon- 

 gitudinal bands which approach each other, but terminate near the 

 apex without meeting. The abdomen is black, with thick, short, 

 black hairs, and some long white hairs; at the middle point is a large, 

 more or less triangular, white spot; posterior to this are two smaller, 

 somewhat oblique, white spots; lower down, and nearer the apex 

 than these, but in a line with them, are two minute white dots. The 

 spots are formed by scales, which, through the microscope, look hke 

 grains of rice. In some specimens there are two oblique white bands 

 on each side, and a white band at the base. Immature specimens 

 frequently have the spots orange-colored instead of white. The legs 

 are black and hairy, barred with rufus in young specimens; on the 

 inner side of the patella of the first leg is a brush of white hairs. 



Habitat. United States. 



Although the markings of this spider are similar to those of P. miniatus, 

 it has no red hairs when adult, and is thus easily distinguished from that 



