220 long's second expedition. 



tlie tip above, dentated on the posterior edge ; posterior tibiae 

 pieeous on its basal incisure ; terminal spine robust, shorter than 

 the first tarsal joint; first joint of the posterior coxae with a 

 robust tooth above near the tip ; abdomen subovatc, polished ; 

 first segment nearly glabrous, second segment hairy on each side, 

 remaining segments hairy near their tips. 

 Length one-fifth of an inch. 



LEUCOSPIS Fabr. 



L. AFPiNis. — Abdomen sessile ; oviduct as long as the abdo- 

 men ; black, varied with yellow ; collar each side and behind 

 margined with yellow, and with an abbreviated, transverse, yel- 

 low line on the anterior submargin. 



Inhabits Pennsylvania. 



% Body densely punctured; antennae, basal joint yellow; 

 collar margined each side and behind with yellow, the yellow 

 abbreviated line on the anterior submargin is about half the 

 width of the collar ; thorax, incisure at the base of the wing dull 

 yellow ; scutel with a transverse yellow line ; wings brownish ; 

 pleura, a yellow line over the insertion of the posterior feet ; feet 

 yellowish, thighs dusky or black at base ; posterior thighs black, 

 with a yellow spot at base and another at tip on the exterior side ; 

 posterior coxae testaceous at tip ; tergum with three nearly equal 

 bands, and an oval, longitudinal spot near the tip, yellow ; venter 

 with a yellow spot each side, opposite to the termination of the 

 third band of the tergum. [ 328 ] 



9 Resembles the male, but the bands of the tergum 

 are more dilated than those of the male, and the first is inter- 

 rupted by the groove of the oviduct; the second band is reduced 

 to a small lateral spot ; the yellow spot at tip is divided by the 

 groove of the oviduct ; the venter is immaculate, and posterior 

 thighs are pieeous on the inner side. 



Length rather more than three-tenths of an inch. 



This species is very closely allied to the dorsigcra and gigaa, 

 but more particularly to the former ; it is much smaller than the 

 gigas, and difiiers from both in many respects, and more obviously 

 in the circumstance of the anterior margin of the collar being 

 black, with an abbreviated yellow line on the submargin. 



I observed this species running actively over the surface of a 



