374 CHARLES T. BRUES. 



elinate ones. Third joint of antennae are very large, broadly lancet-shaped with 

 a very short, stout and bare, black apical arista. Palpi slightly elongated and 

 projecting, with only very weak bristles below. Cheeks each with two small 

 macrochaetae. Thoracic dorsum yellow, with a single pair of dorsocentral macro- 

 chaetae and two strong marginal scutellar bristles. Abdomen without hairs later- 

 ally, the sixth segment elongated. Ovipositor narrow, pointed bluntly at the apex, 

 four times as long as broad. Legs very long and slender; hind tibiae lined with 

 black above and ohsoletely setulose. Wings yellowish hyaline, very large ; the 

 costal vein reaching to the middle of the wing, its cilia of moderate length, but 

 close and very fine. Tip of first vein scarcely nearer to the tip of the costal than 

 to the humeral cross- vein ; second vein not close to the third at its apex, i. e., 

 angle of furcation not very acute; fourth vein slightly and evenly curved: 

 seventh vein distinct. Halteres pale yellow. 



Described from a single female collected at Pine Lake, Wis., 

 June 7, 1890, by Dr. Wra. M. Wheeler, after whom I take great 

 pleasure in naming this species. 



The appearance of the female palpi indicates that in the male 

 these organs will be found to be much enlarged. 



The habits of the present species are not known, but close struc- 

 tural similarity with A. pergandei suggest that it probably lives 

 parasitically on ants, like the latter. 



MEL.4LOXCHA gen. nov. 



Moderately large species with long and narrow wings ; head hemi- 

 spherical ; eyes large. Front narrow, twice as high as broad and 

 with no median groove or ocellar tubercle. Frontal bristles all 

 reclinate, in four transverse rows; the ocellar row consisting of four 

 bristles and the lower ones of two each, the median ones being absent 

 in these rows. Antennae inserted very low down ; elongate oval, 

 pointed at tip and with apical arista. In addition to being greatly 

 elongated they are curved upward, due to an arcuation of the third 

 joint. Palpi small, with delicate bristles. Thorax and abdomen 

 normal in the male. In the female the abdomen is very slender 

 and ends in an asymetrical, sharply pointed, very heavily chitinized 

 ovipositor. Anterior femora each with a small macrochseta on outer 

 side just before the knee. Middle tibiae with no bristles except a 

 single apical spur. Posterior femora rather slender in the female, 

 stouter in the male. Hind tibiae fringed above in both sexes with a 

 series of stout bristles ; with two apical spurs. Wings longer and 

 narrower than usual, costal vein with minute bristles; third vein 

 not forked at tip; four light veins present. Pulvilli and empodium 

 well developed. 



