8 ACADEMY OF NATURAL SCIENCES 



tip : superior caudal process more than double the length of the 

 inferior ones. 



Var. a. Body above unicolor, destitute of the white dorsal 

 vltta. 



Var. b. Body ferruginous, with dusky lateral spots. 



Var. c. Body with several snowy spots each side. 



A common insect in many humid places, probably in almost 

 every temperate part of North America. We observed it as far 

 south as East Florida. It is subject to a great many variations. 



Genus PODURA. 

 Antennae four jointed, filiform, terminal joint entire; body 

 cylindrical : trunk distinct. 



1. P. FASCIATA. — Body yellowish-white with four distant 

 black bands; tail black; bands [13] paler beneath; spring 

 white; antennae blackish ; eyes black. 



Length one-twentieth of an inch. 

 Cabinet of the Academy. 



In considerable numbers under the bark of decaying 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. 1*. IRICOLOR. — Body blackish iridescent; thorax with long 

 hairs before ; abdomen hairy at tip ; feet hairy, whitish ; head 

 beneath and antennoa 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. 



S. UUTTATUS. — Body yellowish white, with numerous reddish- 

 brown, irregular spots, disposed in bands ; numerous, sparse, 



[Vol. II. 



