444 Hentz's Descriptions of the 
but casting irregular threads, cocoon flattened, usually placed 
under leaves, watched by the mother till the young are 
hatched. 
Remarks. Well was it remarked by Walckenaer, that a 
subgenus so easily recognized as Tuomisus is nevertheless 
excessively difficult to characterize. There is not one feature 
save the small size of the cheliceres, a secondary character, 
which is not liable to vary in the different species, and yet, 
the sub-division is a natural one. Nay, the sub-genus Puiro- 
DROMAS Which seems to correspond to my first tribe, the Dz- 
PRESS, does not appear to be sufficiently characterized to be 
separated from this, at least if my Tuomisus vuLcanis can be 
referred to it. 
Secrion I. HETEROPOD.E. Four posterior legs shortest. 
Tribe I. Derressæ. Legs very long, equal in thick- 
ness, body flattened. ; 
i. THOMISUS VULGARIS. 
Plate XXIII. Fig. 1. 
Description. Pale grey, abdomen with four impressed dots, 
body flat; legs with indistinct darker rings. 
Observations. "This spider, commonly seen on fencing or 
prostrate timber, like those of the same genus, moves side- 
ways and backwards, but it is much more active than T. 
celer. When pursued by an enemy, like Arrus and EPeina, 
it leaps and hangs by a thread, which supports it in the alr. 
Habitat. United States. 
Tribe II. Caxwcmoipes. Legs very long, four anterior 
. ones largest, abdomen oval. 
2. THOMISUS ALEATORIUS. 
Plate XXIII. Fig. 2. : ue 
m. Cephalothorax greenish yellow, region ate : 
