NORTH AMERICAN DIPTEKA. 91 



tario, September 8th (Comstock) ; one from Ottawa, Canada (Har- 

 rington) ; and one from Lake Superior ( Westeott). 



Jurinia ainothystiiia Mcq. 



Six specimens from Jamaica, April (C. W. Johnson). 

 Jnriiiia lateralis Mcq. 



Seventy or eighty specimens from Las Cruces, N. Mex., June 4tli 

 to 26th. 



Hy!«tricia aldriehi n. sp. "J, . — Eyes brown, thickly hairy; front promi- 

 nent in profile, about one-fourth width of head at vertex or slightly more, wider 

 before, face about twice as wide ; frontal vitta wide, blackish ; frontal bristles 

 descending about as low as middle of second antennal joint, vertical bristles 

 strongest, directed backward, next pair nearly vertical, rest directed forward 

 and inward, decussate ; one orbital bristle : anterior pair of ocellar bristles strong, 

 directed forward and strongly outward ; sides of front, face and cheeks silvery, 

 with a brassy or even golden tinge, the sides of face bare, the cheeks broadly 

 hairy and cinereous on lower portion ; facial depression shallow, hardly three- 

 fifths width of face, the facial ridges bare, except a few bristles next vibrissse ; 

 vibrissre strong, decussate, inserted at constriction of the facial ridges a good 

 distance above oral margin ; face a little receding, epistoma prominent; antennae 

 about two-thirds length of face, nearly black, second joint elongate, third joint 

 hardly longer than second, widened, truncate at tip, apical corners rounded ; 

 arista blackish, pale rufous in the middle, thickened half its length, microscopi- 

 cally pubescent, 3-jointed, second joint a little or hardly elongate ; proboscis fully 

 as long as hight of head, brownish or blackish, stout, labella developed; palpi 

 elongate, slender, hardly thickened toward tip. dark brown, nearly black, bristly, 

 the longest bristles on the underside; occiput cinereous, thickly gray-hairy, with 

 some black bristles along orbital margin. Thorax slightly wider than head, 

 shining black, more or less silvery pollinose, leaving four heavy black vittae 

 which become indistinct posteriorly ; scutellum shining black, somewhat silvery, 

 with an apical strongly decussate pair of macrochsetae, three stronger lateral 

 pairs, and a weak discal pair. Abdomen somewhat wider than thorax, broadly 

 oval, shining black, more or less silvery pollinose, with something of a dull 

 greenish lustre, first segment hardly shortened but a])pearing so from above; 

 first segment with several lateral niacrochaetae. second with a lateral pair and a 

 median marginal and discal pair, third with a median discal pair and a marginal 

 row of ten or twelve, anal segment with a medial discal pair and a marginal row 

 becoming submarginal or discal on sides; hypopygium exserted, black, hairy. 

 Legs black, front femora somewhat silvery on outside, femora and tibiae very 

 bristly, especially tlie latter; claws and pulvilli elongate, claws rufous at base, 

 black toward tip, pulvilli pale tawny yellowish. Wings grayish hyaline, area 

 along wing veins very slightly clouded, with very small crostal spine, third vein 

 spined at base; apical cell open, terminating well before tip of wing; fourth 

 vein bent at an angle, without stump or wrinkle, or with a very short stump, 

 apical cross-vein concave ; hind cross-vein sinuate, oblique near to bend of fourth 

 vein ; tegulae nearly white, halteres dusky, lighter at base. 



9. — Front fully one-third width of head; two orbital bristles; claws and 

 pulvilli less elotigate. 



Length of body 10—11 mm. ; of wMng 8 — 8. .5 mm. 



TRANS. AM. ENT. SOC. XIX. APRIL, 1892. 



