OF PHILADELPHIA. 13 



slderable resemblance, in the form of tlie palpi, to the C. Geoffroyi 

 of Leach, (Zool. Misc. p. 50.) This species, as well as the pre- 

 ceding, are readily distinguishable from the Phalangium aca- 

 roides of Linne, by the mutic antepenultimate segment of the 

 palpi. 



Order 3. BUOMEBOSOMATA. 



Family 2. PHALANGIDEJE. 



Genus PHALANGIUM. 



Body rounded; feet elongated; tarsi with numerous joints; 

 mandibles salient much shorter than the body : eyes two, sup- 

 ported on a common tubercle. 



1. P. VITTATUM. — Whitish, with a dorsal fuscous vitta; termi- 

 nal joint of the palpi not pectinated with spines. 



Inhabits the Southern States. 



Cabinet of the Academy. 



Body whitish, truncated and fuscous behind, a dorsal fuscous 

 vitta from the clypeus to the cloaca and lateral fuscous line, above 

 with dense, obtuse granules, beneath with distant ones ; three 

 profoundly impressed lines before the middle, of which the an- 

 terior one is semicircular including the ocular tubercle, the inter- 

 mediate one transverse, and the posterior one recurved ; ocular 

 tubercle prominent, slightly contracted at base, crowned with from 

 four to six more conspicuous, acute spines : clypeus not elevated, 

 concave beneath the obtuse tip ; feet, second pair about fifteen 

 times as long as the body ; tarsi capillary, articulations not con- 

 tracted. 



Length, female nearly one-fifth of an inch. Male much smaller. 



The armature of the ocular tubercle is obsolete in the male, 

 and in this sex there are generally two whitish [66] lines, drawn 

 from the base of the occular tubercle to the tip of the clypeus, 

 which are also sometimes visible in the female. 



I have not found these in coitu, but have considered them 

 of the same species, from their being associated and somewhat 

 similar in form and markings. 



2. P. DORSATUM. — Whitish with a dorsal fuscous vitta, joints 

 of the palpi armed with a series of spines. 



Inhabits the United States. 

 1821.] 



