8 Mr. MacLeay on some new forms of Arachnida. 



the arch is typically convex inwards. Now the Thomisidce 

 in general may be said to have their eight eyes disposed, four 

 and four, in two concentric arches, of which the curve is con- 

 vex in front. The four ocelli of the inner arch remain pretty 

 nearly in all the Thomisidce at equal distances from each other : 

 so also do the four of the outer or front arch in Artamus, In 

 the nocturnal genus Olios, of which the type is the Aranea ve- 

 natoria of Linnaeus and the manners very singular,* the con- 

 vexity of the front arch is scarcely to be detected. In the aber- 

 rant genus Thanatus, which is close to Ocyale and Dolomedes, 

 it is more visible. In Philodromus of Koch we see the four 

 front eyes going two and two to eaqh side of the head. In the 

 genus Selenops the anomaly is at the extreme, so as to place 

 the outer edge of what is ordinarily the front arch in the curve 

 of the inner one and the other eyes a little lower. Thus in the 

 subgenus Hypoplatea there are six ocelli in an arch convex 

 outwards and two others in front, one at each corner of the 

 head. The sketch of Hypoplatea celer was taken by me from 

 the animal immediately after death. 



Plate I. Fig. 2. Hypoplatea celer magnified. u, } system of eyes ; /3, men- 

 turn, maxilla and maxillary palpus ; y, sternum. 



Genus DEINOPIS. 



AntenncB proceeding vertically downwards nearly in the same 

 plane with the two large eyes. First joint subquadrate, 

 the second joint or fang closes inwards. 



Eyes eight, two dorsal and six frontal ; of these last two enor- 

 mously large black, shining, spherical eyes occupy the 

 half of the front. Under these in the middle are two very 

 minute ocelli ; and two others also small are placed be- 

 low, one on each, outside of the large eyes, but not on 

 the same vertical plane with them, for these last two 

 small ocelli are somewhat lateral. 



Maxillae subquadrate, thick, and diverging from the men- 

 turn. 



Maxillary palpi with the first joint somewhat dilated ; the 

 others cylindrical, nearly equal, excepting the last, which 



* Walckenaer is in error when he says that this genus feeds on lizards. I 

 believe that no spider lives on Vertebrata. Thomisus morbillosus of the Ap- 

 pendix to King's Survey of the Intratropical Coasts of New Holland belongs 

 to the genus Olios. 



