284 [September 



sutural line before, and a minute line beneath the fore-wings, yellow ; 

 scutellum black, its tip yellowish ; metathorax black, shining, the ele- 

 vated lines well defined, the central area moderate, subrotundate. Wings 

 hyaline, iridescent ; nervures fuscous, pale at base, stigma large, black 

 with a pale spot at base; areolet minute, oblique and petiolated. Legs 

 fulvous, all the coxae and trochanters pale yellow, the posterior tibife 

 brownish. Abdomen subsessile, rather short, broad and subdepressed, 

 polished; basal segment black, remaining segments fulvous, except the 

 sides of the 2nd, 3rd and 4th segments which are blackish. Length 

 2-2 lines; expanse of wings 5 lines. 



Hub. — Delaware. Dr. Thos. B. Wilson. 



5. Cteniscus clavatus, n. sp. 



Black ; face, tegulae, tip of scutellum, most of legs and the abdomen except 

 base, yellowish ; wings subhyaline, iridescent, areolet triangular, petiolated : 

 abdomen clavate. 



Male. — Shining, slightly pubescent ; head black, face beneath the 

 antennas, clypeus, mandibles and palpi, yellow ; antennte longer than 

 the body, black, honey-yellow towards the base, especially beneath. 

 Thorax black; tegulae pale yellow; scutellum convex, black, with a 

 yellowish spot at tip and another on postscutellum ; metathorax with 

 the elevated lines well defined, the central area moderate, (juadrate. 

 Wings slightly stained with fuscous, iridescent; nervures and stigma 

 testaceous, pale at base ; areolet small, triangular, petiolated. Legs pale 

 fulvous, coxEe black, the two anterior pairs beneath, all the trochanters 

 and the anterior tibiae and tarsi, yellowish; posterior tibiae and tarsi 

 blackish, the former with a broad pale annulus on the middle. Abdo- 

 men elongate, clavate, slender at base, polished ; basal segment sublinear, 

 cariuated above and with a prominent tubercle on each side at base ; 

 2nd segment depressed at base with a slight carina on the middle ; re- 

 maining segments convex and gradually dilated, the tip obtusely pointed ; 

 the 1st and base of the 2nd seiiiuents blackish, remaining segments 

 honey-yellow, with the apical margins of the 3rd, 4th and 5th segments 

 yellow, margined in front with black. Length Zl lines; expanse of 

 wings 5 1 lines. 



/:/a6.— Delaware. Dr. Thos. B. Wilson. 



