1848 



REPORT OF THE CHIEF OF ENGINEERS. 



KEPOKT. 



HYMENOPTERA. 



TENTHREDINID^E . 

 UROCERUS. 



Urocerus Flavicornis, Fab. $ . 

 (Sirex Bizonatus Steph.) 



Apatlms Elatus Fab. $.. 



Bonibus Fervidus Fab. $ $ var. 

 JBombus Ternarius Say. 



Megachile Bucephala Smith. 

 Melissodes Trifasciata Cress. 

 Anthidium Formosum Cress. 



Vespa Occidentalis Cress. 

 Polistes Sulpliurea Sauss. 



Pompilus ^Elhiops Cress. 

 Ichneumon Longulus Cress., 



OpMon Purgatus Say. 

 Ophion BiUneatus Say. 



Tliyreopus Vicinm Smith, 



Smicra Bimaculata, n. sp. 



APIDJE. 



APATHUS. 



BOMBUS. 



MEGACHILE. 



MELISSODES. 

 ANTHIDIUM. 



YESPID^E. 

 VESPA. 



POLISTES. 



POMPILID^. 



POMPILUS. 



ICHNEUMON. 

 OPHION. 



THYREOPUS. 



CHALCIDID^E. 



SMICRA. 



Black; face prolonged beneath eyes, closely punctured, on each side at base of an- 

 tennae a subtriangular, lemon-yellow spot; mandibles castaneous at tips; scape of 



