16 ACADEMY OP NATURAL SCIENCES 



in East Florida, where it appears to be common. It is not an in- 

 habitant of the Northern States. 



Family 3. ARANEIDEjE. 



Although I have a considerable number of descriptions of 

 Araneides, which I think are new, yet, as I am not sufficiently 

 well acquainted with the species of this family, in their different 

 ages, prudential motives induce me to refrain from publishing 

 them until further investigation shall qualify me for the task. 



Order 4. MONOMEROSOMATA. 

 Genus TKOMBIDIUM. 



Body consisting of a thorax and head united and distinct from 

 the abdomen ; two anterior pairs of feet distant from the others ; 

 eyes pedunculated, lateral ; palpi with a moveable appendice be- 

 neath their tips. 



1. T. SCABRUM. — Body ovate, broadest and very obtusely 

 rounded before, pale reddish, minutely scabrous, surface unequal, 

 with numerous [70] indentations, and with hardly percepti- 

 ble hairs ; thorax obtriangular, short : eyes white ; feet whitish. 



Cabinet of the Academy. 



In forests, on trees, &c. ; not uncommon. 



2. T. SERICEUM. — Body oblong-subovate, broadest before, 

 narrowing behind, densely covered with short silken hair ; thorax 

 elongated, sublinear, slightly contracted before the middle, and 

 with a darker, central line above : eyes white, placed in a trans- 

 verse line ; feet paler, whitish. 



Cabinet of the Academy. 



Inhabits trees, in forests, under stones, &c., and is more com- 

 mon than the preceding. 



Genus ERYTHR^US Latr. 



Body without division, the two anterior pairs of feet not dis- 

 tant from the others ; eyes two, sessile ; palpi conic, chelate. 



E. MAMILLATUS. — Body ovate, granulated, reddish-yellow, 

 with a marginal impressed line, edge thickened, a robust, 

 obtusely conic, granulated spine on the anterior lateral edge, 

 before the middle of the disk two indented punctures, a 

 few distant hairs ; eyes approximated, whitish ; mandibles granu- 



[Voi. n. 



