308 INSECTS OF LOUISIANA. 



In comparison with irrorata F., which 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 JS. (Chlorion) ichneumoneus F. but 

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

 abdomen and feet are entirely black. 



DIPTERA. 



SCIARA 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. 



