THYSANOURiE OF THE UNITED STATES. 13 



paler beneath; spinng white; antennce blackish: 

 eyes black. 



Length one-twentieth of an inch. 



Cabinet of the Academy. 



In considerable numbers under the bark of decay- 

 ing Live Oak, &c. in Georgia and East Florida. 



2. P. *bicolor. Body plumbeous ; feet with a few 

 hairs, rather paler at base ; nails small, acute; spring 

 large, white ; eyes deep black. 



Length from one-tenth to three-twentieths of an 

 inch. 



Cabinet of the Academy. 



Our most common species, under stones, &c. 



3. P. ^tricolor. Body blackish, iridescent ; thorax 

 with long hairs before ; abdomen hairy at tip ; feet 

 hairy, whitish ; head beneath and antennce hairy. 



Length nearly one-fifth of an inch. 

 Cabinet of the Academy. 

 Inhabits Pennsylvania, common. 



Genus — Smynthurus. Latr. 



Antennae attenuated towards the tip, four jointed, 

 ultimate joint composed of many smaller ones ; trunk 

 and abdomen united into a rounded mass. 



Species. — S. *guttatus. Body yellowish- white, 

 with numerous reddish-brown, irregular spots, dis- 

 posed in bands ; numerous, sparse, white hairs, and 

 two tubercles each side of the middle, which are 

 truncated at tip ; beneath white ; antennce reddish- 

 brown, hairy ; face maculated, a line of irregular 



