AMERICAN UYMENOPTERA. 231 



^. £■ semicornis. 



Eniphijlas scmicornia, Say, Bost. Jonr. I, IS^n. 220, 2, 9. 

 Norton, Bost. Proc. viii, 15(i, 6. 

 "Iloiioy-yellnw: tip of the anteniiJB and disk of the pectus black. Length 

 over tliree-tenths of an inch. 



•'Body honey-yellow; antennte, the four terniiiKil joints black, 

 nasus deeply cniarginate; labruin and nioiith pale yelldwish. the for- 

 mer rounded at tip; stennnata black; thorax with a dusky line on the 

 two middle lobes; scutel dusky on the posterior edt:;e ; metathorax 

 dusky near the scutel ; abdomen immaculate, rather paler at base and 

 beneath ; wings hyaline, nervures blackish ; base of the carpus yellow- 

 ish-white ; pectus before and on the middle black ; coxai whitish, tarsi 

 pale, posterior thighs and tibia3 blackish at their tips." 



Indiana, (Say). Connecticut. 



The only important difference between this and the preceding spe- 

 cies appears to be in the color of the apical joints of the antennae. A 

 single % taken in Farmington, Conn., has the five apical joints of an- 

 tenn;x! black, the head wholly rufous, except a large spot about the 

 ocelli, and the back of head black. The scutellum is wholly rufous. 



9. E. tarsatus. 



Emphytas tarsatus, Say, Bost. Jour. I, 18.35, 219, 1,9- 

 Norton, Bost. Proc. viii, 157, 7, 9 • 

 Black; the four apical joints of autennse, trochanters and tarsi white. 

 Length % 0.S2. Br. wings 0.52 inch. Length 9 0.00. Br. wings 1.12 inch. 

 9 % . ]Jody long and stout; antenna) longer than base of thorax, 

 stout, flattened, serrate, black, with the four apical joints white; head 

 as in J'J. van'aitus, with the sutures at sides of ocelli widened below 

 and enclosing the ba.se of antennaj; nasus deeply incurved, rugose; 

 labrum white, its edge rufous; teguhc piceous or yellow; scutel in 

 middle white; legs black; all the trochanters, the apical half of four 

 anterior tibi;c and their tarsi and the posterior tarsi, except first joint, 

 white, (sometimes the first joint also). Wings smoky hyaline, base of 

 stigma white; second recurrent nervure a little removed from intersec- 

 tion of second and third submarginals. 

 Indiana. (Say), Mass., Conn., West A^a. 



The species embraced in this section resemble the genus Tcnthndo 

 at first sight. 



6. Abdomen short; second recurrent nervure received in middle of second 

 submarginal cell; first joint of hinder tarsi not as long as all the re- 

 main<ler. 



