296 [September 



Section 3. 



9. Cryptus iridescens, n. sp. 



Black ; spot on mandibles, palpi, tegulfe, scutellum, four anterior coxse and 

 trochanters, yellowish-white; legs and abdomen, except tip, pale rufous ; the 

 three apical :6egments black, the 7th with a whitish spot; wings hyaline, beau-, 

 tifully iridescent. 



Male. — Black, slightly pubescent ; spot on each mandible, and the 

 palpi, yellowish-white ; fiice flat, clypeus shining ; antennne slender, 

 nearly as long as the body, black, the basal joint beneath ferruginous, 

 the joints indistinct. Thorax shining; dorsal lines of the mesothorax 

 tolerably well impressed ; pleura finely striated ; a line over the collar, 

 tegulae, a small spot before and another beneath the fore-wing, a large 

 spot on scutellum and the postscutellum, yellowish-white ; scutellum 

 polished, the excavation in front longitudinally striated ; metathorax 

 finely reticulated, near the base a transverse carina arcuated on the 

 disk, and behind the middle on each side a small, semicircular, trans- 

 verse carina, in the place of tubercles. Wings hyaline, beautifully iri- 

 descent; nervures and stigma pale fuscous; areolet rather large, 5- 

 angular or subquadrate. Legs pale rufous, the four anterior coxae and 

 trochanters yellowish, as well as the base of the posterior tibite and the 

 2nd, 3rd and 4th joints of their tarsi ; base of the posterior trochanters, 

 tips of their femora, rest of their tibiae and tarsi, blackish or dusky. 

 Abdomen elongiite, subclavate, pule rufous, shining; basal segment 

 slightly arcuated, polished, with a small tubercle on each side of the 

 apical third ; the three apical segments black, the 7th segment with a 

 rounded white spot above ; sometimes the base of the 2nd and apical 

 margin of the 5th segments are blackish. Length 3^ lines; expanse 

 of wings 5 J lines. 



ifa6^— Delaware. Dr. Thos. B. Wilson. 



10. Cryptus soror, n. sp. 



Black; most of clypeus and mandibles, palpi, tegulse, spot on scutellum and 

 4 anterior trochanters, whitish ; wings hyaline, iridescent. Legs and abdomen 

 rufous; basal half of the 2nd, base of the 3rd and 5th, and the apical segments, 

 except a small obscure whitish spot on the 7th, black. 



Mdlc. — Black, slightly pubescent, sculptured as in the preceding- 

 species ; most of the clypeus and mandibles, and the palpi, whitish ; 

 antennae as long as the body, slender, black, basal joint beneath rufous, 

 the joints indistinctly defined ; tegultB, a minute dot beneath the fore- 

 wing, a spot on scutellum and the postscutellum, whitish. Wings hya- 



