324 BULLETIN r.l, UNITED STATES NATIONAL MUSEUM 



PLATE XI. 



1. Senogaster Comstocki Will., male; \a, wiug; 16, bead of male, front view. 



2. Merapioidus villosus Bigot, bead of female ; 2a, -wing. 



3. Xylota pigra Fabr., wiug. 



4. Eumerus sabulonum Fallen (Europe), wing ; 4a, bead of male. 



5. Chrysochlamys dives O. S., wing; 5a, bead of male. 



6. Xylota flavitiuia Bigot, bind leg of male. 



7. Xylota pigra Fabr., bind leg of male ; 7a, bead of male. 



8. Xylota ejuncida Say, wing ; 8a, bind leg of male. 



9. Xylota angustiventris Loew, bead of male. 



10. Brachypalpus frontosus Loew, bead of male (tbe posterior orbit is too broad 

 above). 



