OF WASHINGTON. 35 



Thorax long, the prothorax long, narrowed anteriorly, mesonotum 

 prominent anteriorly, the scapulae prominent, the scutellum flat with a 

 transverse impressed or punctate line before the tip, metathorax sub- 

 quadrate, the posterior angles obtusely dentate, the dorsum with a medial 

 sulcus. 



Wings narrowed basally, the margins fringed; the marginal vein is 

 very long, and the postmarginal and stigmal veins are very short. 



Abdomen ovate, convex, the apex obtuse, ovipositor sub-exserted, short, 

 stout, and slightly compressed. 



Legs rather long and slender, the coxae large, compressed, the femora 

 most frequently attenuated, tibial spurs i, i, i, the tarsi shorter than the 

 tibiae, the intermediate joints very minute, metatarsus anteriorly dilated, 

 the posterior tarsi elongate. 



This genus is distinguished at once by the long head, the 

 antennas inserted at the mouth, and by the cross-furrow before the 

 tip of the scutellum. 



Five species have been recognized in our fauna, only three of 

 which are known to me, which may be separated as follows : 



TABLE OF SPECIES. 

 Females. 



Blue-black species, 2 



Bluish-green, the tergum with a cupreous band at base, densely 

 punctured. 



Wings hyaline, slightly dusky, >S. polita Say. 



Black, more or less bronzed, the thorax rugoso-punctate. 



Wings dusky with brownish nervures, .... 5 1 . cenea Prov. 

 2. Mesonotum and scutellum aeneous. 



Head and prothorax with large, close, umbilicate punctures; 

 wings hyaline, the marginal vein a little more than half the 



length of the submarginal, 5". rugosicollis, sp. n. 



Head with coarse, distant punctures, the prothorax smooth ; wings 

 hyaline, the marginal vein long, . . 5". drosophtlce, Ashm. 

 Head and prothorax smooth, impunctured; wings hyaline, the 

 marginal vein two-thirds the length of the submarginal, 



.S. kcematobtce, sp. n^ 

 S. polita Say. Leconte Ed. Say's Works, vol. i, p. 382. 



"Bluish-green; tergum with a cupreous band at base. Inhabits Vir 

 ginia. 



" Body bluish-green, varied with violaceous, densely punctured ; front 

 grooved to receive the basal joint of the antennae; flagellum fuscous; 

 wings hyaline, slightly dusky ; scutel somewhat prominent; abdomen a 

 little depressed; first segment brilliant cupreous; incisures glabrous; 

 terminal segment longer than the others together, forming at tip a nar- 



