Sept., I9I3-] Melander: Synopsis of Diptera. 257 



blackish. (Pa., Mass.,* N. Y.,* N. J., 111.,* Wise, La., N. Mex., Col., 



Id.,* Wash.*) . . ". platyptera var. coronata Loew. 



Front entirely yellow, not bordered with black; face yellow 52. 



52. Lateral yellow stripe of the thorax extending beneath the wings, {inalz'cc 



Burgess.) (Wise, N. H., N. J., D. C, Fla., W. Ind.,* Ga., La.,* 111.,* 



Mo., Tex.,* Col.) platyptera var. jucunda Wulp. 



Lateral stripe extending above the root of the wings, (lateralis Williston, 

 1896, and not of Macquart, 1835, from Europe.) (W. Ind.) 



platyptera var. allecta nom. nov. 



53. Base of antennae, scutellum, a prescutellar spot, pleurae, abdomen, and legs 



mostly yellow ; anterior crossvein opposite or beyond the end of the 



first vein. (Wash.,* Alaska.*) pacifica n. sp. 



Mostly black species, the whole of the antennae, the mesonotum except the 

 sides, the scutellum except the tip, the abdomen, and much of the 

 pleurae and legs black ; anterior crossvein before the end of the first 

 vein. (2 mm. (Id.*) varia sp. nov. 



54. Scutellum entirely black ; thorax opaque black, the abdomen black, except 



at sides and sometimes the incisures 55. 



Scutellum yellow, at least in the middle 57. 



55. Legs, antennae, cheeks, face and lower part of the front whitish; sections 



of the fourth vein about i : 10; mesopleurae yellow. (Wash.*) 



clara n. sp. 

 Legs blackish, antenna somewhat infuscated ; face, front and cheeks yel- 

 low ; sections of the fourth vein about 1:6; pleurae largely cinereous. 56. 



56. Knees not differentiated; three fronto-orbitals. (Eur.;* Id.,* Wash.*) 



perpusilla Meigen. 

 Knees yellow. (Greenland.) arctica Lundbeck. 



57. Palpi large, projecting; scutellum with two bristles; thorax reddish, abdo- 



men brown, its base yellowish ; legs yellow, the hind femora tipped 

 with black ; penultimate section of the fourth vein longer than the 



last section of the fifth vein. (W. Ind.) innominata Williston. 



Palpi small ; four scutellar bristles ; four dorsocentrals ; mesonotum more 

 or less black; penultimate section of the fourth vein much shorter 

 than the last section of the fifth vein 58- 



58. Notum pruinose, pleurae and abdomen but little shining; cheeks nearly as 



deep as the width of the eye. (If the cheeks are narrow compare 



perpusilla and pacifica.) (Id.*) lima n. sp. 



Shining or subshining; cheeks relatively narrow 59- 



59. Usually broader and larger ; mesonotum with a quadrate yellow spot in 



front of the scutellum ; front usually square ; sections of the fifth 



vein 2:3 60. 



Smaller and more slender ; mesonotum black to the scutellum ; front nar- 

 rower than deep ; sections of the fifth vein more nearly i : 2. {Scu- 

 tellata Fallen.) 63. 



60. Ovipositor long, tubular, equalling three abdominal segments in length. 



(W. Ind.*) : {Liriomyza) tubifer n. sp. 



