248 A. L. MELANDER. 



poUinose ; proboscis slender, rigid, slightly longer than the height of the head 

 only slightly longer than the palpi. Thorax black, shining, lightly poUinose, the" 

 pile rather long, yellowish white ; pleurae black, subshining, lightly poUinose, 

 no long pile in front of halteres ; scutellum black, subshining, bearing two long 

 yellowish apical bristles and several shorter ones. Abdomen black, shining, its 

 long pile yellowish white. Coxfe and femora black, apices of front and middle 

 femora yellow ; front and middle tibiae yellow, the hind ones black ; tarsi yellow, 

 underside of the first two joints of the hind tarsi beset with small black points, 

 sides of hind metatarsi destitute of long black spines. Knob of halteres yellow. 

 Wings hyaline, the stigma grayish brown. 3-4 mm. 



New Hampshire, Massachusetts, Wisconsin ; numerous specimens. 



Hybos reversus Walker. 

 List Dipt. Ins., iii, p. 487. 



Body black, shining; eyes dark bronze; feelers black; abdomen clothed with 

 long hoary hairs ; legs yellow ; hips, thighs and hind shanks black ; tips of four 

 front thighs yellow; four front shanks tawny towards the base ; hind feet and 

 tips of four front feet tawny ; wings pale brown, darker along the borders of the 

 veins, colorless at the base ; wing-ribs and poisers yellow ; veins piceous, yellow 

 towards the base. 4 mm. 



Trenton Falls (Walker) ; Jamesburg, N. J. (C. W. Johnson). 



Hybos triplex Walker (Figs. 79, 80, 81). 

 Hybos purpureas Walker, List Dipt. Ins., iii, p. 486. 

 Ht/bos duplex W^alker, List., etc., p. 486. 

 Hybos triplex Walker, List, etc., p. 486. 

 Hybos subjectns Walker, List, etc., p. 487. 

 Euhybos Coquillett, Proc. Nat. Mus., 1895, p. 437. 



As this genus contains some of the most variable of flies, it is 

 not strange that with the limited material at his disposal Mr. 

 Walker should erect four species on what is now given as a single 

 form. The unusually rich collection of this species shows variations 

 in color to every degree ; hence, even the Mexican varieties which 

 are to some extent distinct had better be dropped as varietal names. 

 In establishing these forms it was not the intention to erect mere 

 catalogue names, but to give convenience in handling the collections. 



The name triplex is chosen, as it has been used more than the 

 others for this species. 



The genus Euhybos Coquillett, established on Walker's species, 

 has been rejected because its characters are shared in varying part 

 by the Mexican species. 



Head: occiput finely dusted, finely pubescent. Eyes brownish, contiguous 

 above and below the antennae. Antennae black, third joint oval to subulate, 

 blunt at the tip or gradually passing into the arista. Mouth parts inconspicuous. 



