SIO APPENDIX. 



yellow, transverse, angulated line ; scutel yellow ; meta- 

 thorax yellow on the posterior edge ; jjleura bilineate 

 with yellow ; loings with a broad, light brown costal mar- 

 gin and tip ; feet, intermediate and posterior pairs with 

 yellow tibiae and tarsi, a rufous spot being near the knee ; 

 anterior thighs blackish on the inner side, with a yellow 

 exterior inferior margin, and numerous spines on the infe- 

 rior edge, of which one is very prominent ; tergum at the 

 base of the first and second segments black, the former 

 margined with yellow ; venter black at base, segments 

 broadly margined with yellow. 



9 The yellow colour and marginings, excepting on the 

 feet and first segment of the thorax, obsolete ; the wings 

 are darker than those of the male, and the hyaline por- 

 tion of the wings is tinctured with a shade of the general 

 colour. 



Length of the body 'S half an inch, ? to tip of wings 

 more than nine-tenths of an inch. 



A specimen of the female of this curious insect was pre- 

 sented to me about a year ago by Mr. William Mason of 

 this city ; it was found near Philadelphia by Mr. Tyler. 

 The male occurred on St. Peter's river. 



ORDER HYMENOPTERA. 



XYELA, Balman. 



X. ferruginea. Ferruginous ; thoracic spots and base of 

 the abdomen blackish. 

 Inhabits Arkansa. 

 tflntennx fuscous, basal joint ferruginous ; above the an- 



