Attidai of North America. 33 



PLEXIPPUS PUERPERUS Hentz. 



Plate I, figures 23, 23a. Plate II, figure 23a. Plate HI, figure 23b. 



Syn,: 1845. Xttvs, puerpemis Hentz, Journal Boston Soc. Nat. Hist., Vol. 

 V. 



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



1846. Alcmeis^a j;ifl?//da C. K., Die Araclm., XIII, p. 179. 



1874. Attus branickii Tacz.. Les Araneides dela Guyane franpaise, 



Horae Soc. Entomol. Ross. T., VIII, p. 94. 



1875. AlTXJS jmetperus Hentz, CoU. Arachn. Writ. Ed. by Burgess, 



p. 64. 

 1879. Marpissa branickii Tacz.. Les Araneides du Perou. Bull. 



Soc. Imp. des Nat. de Moscou. T. LIII, p. 227. 

 1883. Attus agrestis Peckham, Descr. new or little know Attidae of 



U. S., p. 12. 

 1885. Plexippus puerperus id. , Proc. Nat. Hist. Soc. of Wisconsin, 



p. 68. 



As Dr. Taczanowski has kindly sent us specimens of his Attus branickii 

 we have been able to compare them with ]merp>erus Hentz. They 

 are undoubtedly identical. We have the same spider in our own col- 

 lection, from Central America. 



3 . Total length' 11 mm. Width of abdomen 2.4 mm. 



Cephalothorax: length 4; width 2.4; height 2.8. 



Legs 12.3, 10.3, 10.5, 10.8; patella and tibia of the first 5.4; patella and tibia 

 of the third 3.9; patella and tibia of the fourth, 3.8; metatarsus and 

 tarsus of the fourth, 3.9. 



? . Total length 13.6 mm. Width of abdomen 4.7 mm. 



Cephalothorax: length 4.8; width 4.2; height 2.8. 



Legs 10.6, 9.1, 10.4, 11.7; pateUa and tibia of the first, 4.8; patella and tibia 

 of the third, 3.9; patella and tibia of the fourth, 4.1; metatarsus and 

 tarsus of the fourth, 4.3. 



Cephalothorax high, rounded on the sides and widest behind the dorsal 

 eyes. The cephalic part occupies two-fifths of the cephalothorax; it 

 is nearly plane and slightly inclined. The thoracic part is somewhat 

 rounded but falls steeply from the dorsal eyes. The ocular area is one- 

 foui'th wider than long and is a little wider behind than in front. 

 The anterior row is moderately curved: the middle eyes are sub-touch- 

 ing and are scarcely twice as large as the lateral eyes, the lateral being 

 separated from the middle by one-third their own diameter. The 

 eyes of the second row are placed not quite as far from the dor- 

 sal as from the lateral eyes. The dorsal eyes are a little smaller than 

 the lateral eyes and are placed hj more than their own diameter in- 



1 The size of the male is very variable, ranging from 5.G mm., total length, to 11 mm. 

 C 



