1 



1867), paralyzes it with its formidable sting, and inserting an 



egg in its body, places it in its nest, dug to the depth of five 

 inches. There is but a single brood, 

 produced in June, which is killed off by 

 the. frosts of November. This species 

 feeds in summer "upon the honey and 

 pollen of the flowers of the Elder, and 

 of Vitis ampelopsis, the Virginia Creeper ; 

 but its favorite nourishment is taken from 

 the blossoms of Asdepias quadrifolium" 



(Lincecum.) P. cylindricus Cresson (Fig. 93, wing) is one of 



our smallest species, being 



from three to five lines 



long. It occurs in the 



South and West. P. arctus 



Cresson (Fig. 94, wing) in- 

 habits Colorado Territory. 



P. Marice Cresson (Fig. 95, 



? enlarged) is a beautiful 



and rare species found in 



Pennsylvania. The genus 



Priocnemis is characterized 



by the two hind pair of 



tibise being serrated ( 



Fig. 96, a, wing ; 6, pos- 



Fig. 95. 



terior leg ; c, anterior leg), and by the want of spines on the an- 

 terior legs. P. unifasciatus Say is a wide-spread species and 



readily recognized by the deep black 

 color of the body, the yellow an- 

 tennae and the large yellow spot at 

 the tip of each anterior wing. 



The genus Agenia (Fig. 97, a, 

 wing ; 6, posterior leg) differs in 

 having smooth legs. A. brevis Cres- 

 son (Fig. 98, wing) is a little spe- 

 A. congruus Cresson (Fig. 99, wing) 



\ 



Fig. 96. 



cies found in Georgia, 

 was captured in West Virginia ; and A. acceptus Cresson (Fig. 

 100, wing) in Georgia. The genus Notocyphus (Fig. 101, 

 ?,wing) is found in Brazil and Mexico. Planiceps (Fig. 102, 



