POMPILID^E. 



17;; 



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 Vitfs ampelopsis, the Virginia Creeper ; 

 but its favorite nourishment is taken from 

 the blossoms of Asdepias quadr! folium" 



Fig. 93. 



Fig. 94. 



(Lincecum.) P. cylmdricus 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. Mar ice Cresson (Fig. 95, 

 enlarged) is a beautiful 

 and rare species found in 

 Pennsylvania. The genus 

 Priocnemis is characterized 

 by the two hind pair of 

 tibia. 1 being serrated ( 5 , 

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

 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, , 

 wing ; &, posterior leg) differs in 

 having smooth legs. A. brevix Cres- 

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

 A. congruus Cresson (Fig. 99, wing) 



Fig. 95. 



Fig. 96. 



cies found in Georgia, 

 was captured in AVest 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, 



