Pechliam — Spiders of the Family Attidafl 345 



^ ■ Opistlioncus L. K., 1880. 



l*or illustration see Aracliniden Australieyis, Kocli and Kej- 

 serling, PL CII, figs. 5-6. 



Meclinni sized spiders. 



The cephalothorax is not very higli and is only a little longer 

 than wide. It is highest and widest at the dorsal eyes, the np- 

 per surface being lightly rounded, while the outline of the sides 

 is narrowed in curving lines, both in front and behind. The 

 quadrangle of the eyes is from one-third Vv^ider than long to 

 about twice as wide as long, is from a very little, to plainly, 

 wider behind, and occupies two-fifths of the cephalothorax. The 

 first row of eyes is straight or a little curved ; the middle eyes 

 are twice or nearly twice as large as the lateral, and are close 

 together, the lateral being a little separated from them. The 

 second row is from a little to verv much nearer the first than the 

 third. The third row is not so vvide as the cephalothorax at t hat 

 place. The relative length of the legs in the males is 1243, or 

 1423, and in the females, 1243 or 1423, the first being longest 

 and stoutest and the others not very unequal. 



The type of Opistlioncus is Ivaeativentris L, K., {AracJin. 

 Aiistraliens, p. 1184). This species is not in our collection, but 

 we have polypliemus L. K., cdhorufescens L. K., pallidens L. K., 

 ahnormis L. K., bitaeniatus L. K., parcedentatus Rainbow, and 

 a new species, verisimilis, described below. Of these ahnormis 

 is a small species with the first row of eyes bent downward, with 

 the quadrangle very slightly wider behind, and with the cephalo- 

 thorax higher and less widened than it should be for this genus. 

 Bitaeniatus is also a poor Opistlioncus, approaching Simaetha 

 in having the lateral eyes of the first rovv^ very widely separated 

 from the middle eyes. These species are all from Australia. 



For convenience in distinguishing the species of Opistlioncus 

 we give the following notes. 



In alhorufescens $ the first row of eyes is straight ; middle 

 eyes less than twice lateral; quadrangle one-third Avider than 

 long, and plainly wider behind. In pallidens ? the relative 

 length of the legs is 1423; first row straight; middle nearly 

 twice lateral ; quadrangle nearly twice as wide as long, and a 

 little wider behind. In parcedentatus $ the legs are 1423 ; 



