PULMONARIiE. 199 



We will terminate this section with the subgenus 



Mvrmecia, Lat., 



Which seems to lead to the following one, and whose characters 

 we have detailed in the Ann. des Sc. Nat., Ill, p. 27. The eyes form 

 a short and broad trapezium? there are four before in a transverse 

 line; two others, more internal than the two last of the preceding 

 ones, form a second transverse line; the last two are behind the two 

 preceding ones. The chelicerae are stout. The jaws are rounded 

 and very hairy at the end. The ligula is nearly square; somewhat 

 longer than broad. The legs are long, and almost filiform; those of 

 the fourth and first pairs are the longest of all. The thorax seems to 

 be divided into three parts, of which the anterior is much the larg- 

 est and square, the two others resemble knots or humps. The abdo- 

 men is much shorter than the thorax, and is covered with a solid 

 epidermis, from its origin to the middle. 



The Myr. fulva, on which I have established this genus, inha- 

 bits Brazil; other species however appear to be found in Geor- 

 gia, United States of America. 

 In the second section of the Vagabundae, that of the SaltigradjE, 

 called by others Jlraignees phalanges, the eyes form a large quadrila- 

 teral, the anterior side of which, or the line formed by the first ones, 

 extends across the whole width of the thorax; this part of the body 

 is almost square or semi-ovoid, plane or but slightly convex above, 

 as wide anteriorly as in the rest of its extent, and descending sud- 

 denly on the sides. The legs are fitted for running and leaping. 

 The thighs of the two forelegs are remarkable for their size. 



The Araignee a chevrons blancs of Geoffroy, a species of Sal- 

 ticus very common in summer on walls or windows exposed to 

 the sun, moves by jerks, stops short after a few steps and raises 

 itself on its fore legs. If it discover a fly, or particularly a 

 musquito, it approaches softly, and then darts upon the victim 

 with a single bound. It leaps fearlessly and perpendicularly on 

 a wall, being always attached to it by a thread, which lengthens 

 as it advances. This same filament also supports it in the air, 

 enables it to ascend to its point of departure, and allows it to be 

 wafted by the wind from one place to another. Such, gene- 

 rally, are the habits of the species that belong to this division. 



Several construct nests of silk resembling oval sacs open at 

 both ends, between leaves, under stones, Sec. Thither they re- 

 tire to change their tegument and to seek shelter in bad weather. 

 If danger menaces them there, they leave it at once and escape 

 with speed. 



The females construct a sort of tent, which becomes the 



