PULMONARIiE. 191 



We now come to Spiders that are sedentary, like the preceding, 

 but which have the faculty of moving sideways, forwards and back- 

 wards, in a word, in all directions. They constitute our section of 

 the Laterigrad^:. The four anterior legs are always longer than the 

 others; sometimes the second pair surpasses the first, and at others, 

 they are nearly equal; the animal extends them to the whole of their 

 length on the plane of position. 



The chelicerse are usually small, and their hook is folded trans- 

 versely, as in the four preceding tribes. Their eyes, always eight 

 in number, are frequently very unequal, and form a segment of a 

 circle or crescent; the two posterior lateral ones are placed farther 

 back than the others, or are nearer to the lateral margin of the tho- 

 rax. The jaws, in most of them, are inclined on the lip. The body 

 is usually flattened, resembling a crab; the abdomen is large, round- 

 ed, and triangular. 



These Arachnides remain motionless on plants, with their feet 

 extended. They make no web, simply throwing out a few solitary 

 threads to arrest their prey. Their cocoon is orbicular and flat- 

 tened. They conceal it between leaves, and watch it until the young 

 ones are hatched. 



Micrommata, Lat. Sparassas, Walck. 



Jaws straight, parallel and rounded at the end; eyes arranged four 

 by four, on two transverse lines, the posterior of which is longest, 

 and arcuated backwards. The second legs, and then the first, are 

 the longest; the ligula is semicircular(l). 



Microm. smaragdula; Ar. smaragclula, Fab.; Jir. viridissima, 

 De Geer; Clerck, Aran. Suec. pi. 6, tab. iv. A medium size; 

 green; the sides edged with light yellow; abdomen greenish 

 yellow, intersected on the middle of the back by a green line. 

 It ties three or four leaves in a triangular bundle, lines the 

 interior with a thick layer of silk, and places its cocoon in the 

 middle; the latter is round, white, and so diaphanous, that the 

 ova can be perceived through its parietes. The eggs are not 

 agglutinated. 



M. Argelas; Dufour, Ann. des Sc. Phys., VI, p. 306, XCV, I; 

 Walk., Hist, des Aran., IV, ii. This animal, whose specific ap- 

 pellation will remind the French naturalists of one of their most 



(1) M. Walckenaer places this genus in that series which is composed both of 

 the Vagabundse and the Sedentarix, such as the Jlttas or our Saltici, the Thomisi, 

 Philodromi, Drassi, and Clubiona;, and which have but two hooks to the tarsi. 



