THE GANADLVN ENTOMOLOGIST. 125 



less distinctly so. Knob of the halteres green. Abdomen brownish yel- 

 low, the incisures and posterior angles of the segments yellow, the sides 

 of the base greenish, across the anterior part of the segments the colqr 

 broadly brown. Legs reddish yellow, the hind tibiae and tarsi brown, two 

 last joints of all the tarsi blackish. Wings with a faint yellowish tinge. 



Three specimens, Virginia (Pergande), and Georgia. I would at first 

 have identified this species with Sargus trivitatus of Say, but grass green 

 can in no wise be applied to my specimens, the color being so faint green 

 that it is scarcely observable to the naked eye. The third joint of the 

 antennae is by no means rounded, but trapezoidal in shape. 



Her met i a aiirata Bellardi, Saggio, etc. i., 27, tab. i., fig. 8 ; Loew, 

 Centur. x., 11 (H. chrysopila). 



A single specimen from New Mexico agrees very well with the des- 

 criptions. The first joint of the antenna is chiefly black. 



Hermetia lativeiitris Bellardi, op. cit., 27, tab. i. fig. 9. 



A female from New Mexico. I refer to this witli some doubt. The 

 head is wholly yellow, except the ocelli; the first segment of the abdomen 

 is not black, the second has a narrow median black stripe. Bellardi's 

 figure shows but three posterior veins, probably an inaccuracy. 



Hermetia Comstocki, n. sp. 



1^, ^. Length 15-1S mm. Head reddish yellow, with yellow pile. 

 Antennae only a little darker yellow, the tip of the second joint and the 

 lamella deep black; lamella rather broad. Dorsum of thorax blackish 

 brown or black, the sides and the middle behind brownish red ; the black 

 forms two rather broad median stripes, abbreviated behind, separated by 

 a golden tomentose stripe ; on each side there are two large indefinite 

 black spots ; on each humerus, running inwards and backwards for a 

 short distance, a sjiot of golden tomentum. Pleurae, except above and 

 the sides of the metanotum, black, a spot above, contiguous with that on 

 the side of the dorsum, clothed with yellow pile. Scutellum yellowish 

 red, the base narrowly black. Abdomen brownish red, but variable, some- 

 times brown or blackish, the second segment on its posterior border and 

 the remainder of the abdomen, with short thick golden pile, changeable in 

 different reflections. Abdomen elongate, broadest on the second segment. 

 Legs wholly reddish yellow, front coxa^ in front of the same color, the 

 tarsi a little lighter, tibial somewhat dilated, the hind pair very distinctly 



