272 [Septemkeii 



tellum dull testaceous ; metathorax blackish on the disk, and pale on 

 the sides. AVings ample, hyaline, glossy and iridescent; nervures fus- 

 cous, pale at base ; stigma large, blackish, pale at base ; areolet subtrian- 

 gular, oblique, subpetiolated, 2nd recurrent nervure slightly bent. Legs 

 slender, color of the body, the coxae paler. Abdomen slightly petiolated, 

 clavate, polished, pale testaceous, the first segment blackish, gradually 

 dilated towards the apex, without lateral tubercles ; apical segments 

 faintly obfuscated. Length 8 lines; expanse of wings 6 lines. 



i/f/6.— Delaware. Dr. Thos. B. Wilson. 



This may possibly be a variety of M. uaicolor, which it resembles 

 much in size and form, but the coloration is quite different. 



30. Mesoleptus antennatus, n. sp. 



Pale ferruginous ; head and antennae black, the latter with a broad white 

 annulus ; palpi, four anterior coxse and all the tarsi, pale : wings hyaline, are- 

 olet triangular, scarcely petiolated. 



Male. — Pale ferruginous, shining ; head black, pubescent, mouth 

 rufo-piceous, palpi pale; antennfe as long as the body, black, the basal 

 joint beneath pale ferruginous, beyond the middle a broad white annu- 

 lus. Thorax : mesothorax varied with fuscous, the pleura tinged with 

 yellowish ; lines of the metathorax rather indistinct, the central area 

 very elongate. Wings hyaline, beautifully iridescent ; nervures and 

 stigma dark fuscous, the former testaceous at base ; areolet triangular, 

 scarcely petiolated. Legs pale ferruginous, the four anterior coxne and 

 legs in front and the posterior tarsi except tips, pale ; posterior tibi;i3 

 obfuscated. Abdomen long, slender, polished, the extreme base and 

 apex more or less obfuscated. Length 3 2 lines; expanse of wings 5 

 lines. 



^«&.— Delaware. Dr. Thos. B. Wilson. 



Readily distinguished by the broad whitish annulus on the antennae 

 and the general coloration. 



Genus TEYPHON, Grav. 



Sect. 1. — Scutellum and abdomen black Sp. 1 — 3 



" 2. — Scutellum pale ; abdomen black, the margins of the seg- 

 ments pale Sp. 4 — 5 



" 3. — Scutellum pale; abdomen yellow and black Sp. (S 



" 4. — Scutellum black; abdomen red, or red and blnnk. or t)laek 



and yellow Sji. 7 — 16 



