296 Wisconsin Academy of Sciences, Arts and Letters. 



In the general form of the body this genus stands about half-way be- 

 tween Attus (Walck) Thorell and Euophrys (C. Koch) Thorell, being dis- 

 tinguished from the former by its low clypeus, and from the latter by the 

 posterior eyes being a little further from the margin of the cephalothorax 

 than from each other; and agreeing in the form of the abdomen more 

 with Marptusa Thorell ; the form and armature of the first pair of legs, 

 however, separates it widely from these genera; in this respect it is ni^re 

 like Synemosyna and Diolenius. 



PLEXIPPUS (C. Ko3H), 1845. Keyserli.vg. 



Syn.: 1846. Plexippus C. Koch, Die Arachn., XIII, p. 93. 



1877. " Thorell, S udi Ragni Ma'esi e Papuani, I, p. 26S. 



1878. " Id., ibid., II, p. 240. 



1880. " Karsch, Arachnol. Blatter, VIII, Zur Kenntniss 



der Attiden, in Zeitsch. f. d. Naturwissensch. 

 LlII, p. 398. 



1881. " Thorell, Studi Ragni Mai- si e Papuani, III, 



p. 526. 

 1883. " L. Koch and Keyserling, Arachniden Austra- 



lieus, p. 1425. 



Cephalothorax moderately high, descending steeply to the posterior border^ 

 slightly convex over the back, a fourth or a fifth louger than wide, 

 gently rounded on the sides, and only a little wider at the third row 

 of eyes. 



Eyes of the face in a modera*ely bent row, the lateral half as large as the 

 middle eyes and only slightly separated from them. The eyes of 

 the third row smaller than the lateral eyes of the first row. The 

 small rvedian eyes nearer the anterior than the posterior lateral eyes. 

 ^The quadrangle longer than wide, find a little wider behind thaa in 

 front, not reaching the middle of the cephalothorax. The eyes of 

 the third row further from each other thaa from the lateral borders. 



Sternum somewhat wider than the coxae of the second pair. 



Falces rather long, stout, vertical, locked together, almost cyliodrical, 

 rough with transverse wrinkles, and having a dull lustre; the fang 

 rather short and bent. 



L ip not longer than wide. 



Palpus rather long, somewhat slender ; ( 3 ) the tarsus scarcely longer than 

 the metatarsus, but little swollen, with the extremity directed down- 

 ward, and with a moderately large bulb. 



' In all the species described by Keyserling under this genus the quad- 

 rangle is wider than long. 



