/ AMERICAN IIYMENOPTERA. 127 



Ijles at base and the cheeks, tips of mandibles piceous ; antennae long;, 

 slender, dull black, the scape silvery pubescent; posterior margin of 

 the prothorax much depressed and arcuate ; wings hyaline, irides- 

 cent, apical margin fuliginous; wing-cells shaped as in homhi/cuius ; 

 legs long and slender, sericeous, the coxa3 silvery, anterior tibias and 

 tarsi more or less, and all the tibial spurs, pale testaceous ; abdomen 

 long, slender, strongly clavate, the first segment long and cylindrical, 

 the remaining segments together forming, as it were, an oblong-ovate 

 club ; apical segment more or less white. Length 4 lines. 



Ilab.—^Yest Virginia, (Coll. Am. Ent. Soc). 



Two S specimens. Resembles pulrhrinus in general shape, but is 

 more slender, and is at once separated from that species by the absence 

 of the white markings on the face and anterior coxte ; the abdomen is 

 also more strongly petiolated. 



95. Pompilus (Agenia) petiolatus, n. sp. 



Male. — Small, slender, black, densely covered with a fine, short, 

 whitish pubescence, very dense on the face, metathorax and coxie ; 

 clypeus truncate in front; mandibles reddish at tips; antennae robust, 

 moderately long; prothorax arcuate behind; wings hyaline, iridescent, 

 extreme tips dusky; marginal cell oblique at tip, the second submai'- 

 giiial conical when viewed longitudinally, receiving the first recurrent 

 nervure before the middle, third submarginal subquadrate, slightly 

 narrowed towards the marginal, receiving the second recurrent nervure 

 at the middle; tips of the anterior fiemora, their tibiaj entirely, and 

 the base of their tarsi, testaceous ; tibial spurs black ; abdomen long, 

 very slender, strongly petiolated, the apical segment with a white spot. 

 Length 3 lines. 



//«/;.— Illinois, (Coll. Am. Ent. Soc.) 



One % specimen. Closely allied to agUix, but is much smaller, more 

 slender, and with shorter, thicker antennae. 



96. Pompilus (Agenia) iridipennis, n. sp. 



Malt. — Small, black, rather thinly clothed with a fine whitish pile, 

 dense and silvery on the face, metathorax and coxae; face short; cly- 

 peus small, broadly rounded anteriorly; mandibles reddish at tips; au- 

 tennte moderately long, slender, entirely black; posterior margin of 

 the prothorax angular; wings hyaline, beautifully iridescent, the api- 

 cal margin and a spot in the second and third submarginal and third 

 discoidal cells, pale dusky; marginal cell lanceolate; second submar- 

 ginal much longer than the third, subquadrate, pointed towards the 

 base of the wing, receiving the recurrent nervure in the middle; third 



