808 INSECTS OF LOUISIANA. 



In comparison witli irrorata F., whicli it most resembles, the 

 anterior termination of the head is more obtusely rounded trans- 

 versely, rather longer and much less convex on the inferior front : 

 the hemelytra are more hyaline and are not spotted ; the color of 

 the abdomen is quite different and the anterior tibiae are sub- 

 clavate. 



HYMENOPTERA. 

 SPHEX. 



S. HABENA. — Black, head and thorax varied with golden. 



Inhabits Louisiana. 



Front and nasus golden : antennae entirely black : behind the 

 eyes a large golden spot : collar golden : thorax with a golden 

 vitta each side, meeting before the scutel and anteriorly curved 

 downward before the wings and terminating in a double spot on 

 the pleura : metathorax, a transverse line under the scutel, disk 

 and line each side extending to the posterior coxae golden : wings 

 tinged with ferruginous at base and dusky towards the tip : 

 third cubital cellule triangular, anteriorly almost acute : first 

 recurrent [15] nervure almost continuous with the dividing 

 nervure of the second and third cellules: abdomen entirely 

 black, a little sericeous at base ; petiole short, distinct : feet en- 

 tirely black. 



Length over one inch. 



Intimately connected with S. (^Chlorion) ichncumoneus F. but 

 aside from some differences in the neuration of the wings, the 

 abdomen and feet are entirely black. 



DIPTERA. 



SCIAKA Latr. 



S. DiMiDiATA. — Black ; abdomen dull fulvous, black at tip. 



Inhabits Louisiana. 



Female. — Thorax polished: wings fuliginous; costal margin 

 blackish ; middle nervure very distinct : poisers blackish : abdo- 

 men dull fulvous, with a few blackish hairs on the three basal 

 joints, fourth joint a little darker; tip black : feet piceous-black. 



Length of the body less than one-fifth of an inch. 



