PULMONARliE. 301 



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

 but wliich 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 tlie 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 : tlie two posterior or lateral ones are placed farther back 

 than the others, or are nearer to the lateral margin of the thorax. 

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

 usually flattened, resembling a crab ; the body is large, rounded, and 

 triangular. 



These Arachnides remain motionless on plants, Avith their feet 

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

 threads to arrest their prey. Their cocoon is orbicular and flattened. 

 They conceal it between leaves, and watch it until the young ones 

 are hatched. 



MicROMMATA, Lat. — Sparassus, 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 

 tlie longest ; the ligula is semicircular *. 



Microm. smaragdula ; Ar.smaragdida, Fab. ; Ar.viridissima, 

 De Geer ; Clcrck, Aran. Suec. pi. 6, tal). 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 cocoons 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 • Diifour, Ann. des Sc. Phys., VI, p. o06, XCV, 

 1 ; AValck., Hist, des Aran., IV, ii. This animal, whose specific 

 appellation will remind the French naturalists of one of tlieir 

 most zealous sevans, one already recommended by me to their 

 esteem as my protector from tlie horrors of the revolution, is one 

 of the largest species indigenous to France ; M. Dufour has 

 completed my description of it, and has observed its habits. The 

 body is about seven or eight lines in length, of a cinereous 

 flaxen colour, covered with down, and more or less spotted with 

 black. The top of the abdomen, from its middle to the extre- 

 mity, is marked with a band formed of a series of small hatchet- 

 shaped spots, of the last mentioned colour. A black longitudinal 



* M. Walckenaer places this genus in that series \v-hich is composed both of the 

 Vagabundse and the Sedentaria;, such as the Atta or our iSaltici, the Thomisi, Philo- 

 dromi, Drassi, and Clubionfe, and which have but two hooks to the tarsi. 



