NORTH AMKRIOAN DIPTEUA. llo 



PLiAOIPKOKI'IIKKYKA n. ^eii. 

 This genus (lifters from Phorocera in having the eyes bare, and the 

 liind cross-vein more or less oblique and closely approximated to the 

 small cross-vein ; it differs from Pro.ipherj/sa in the latter particular, 

 the wing venation being unmistakably of the Plagia pattern ; it 

 differs from Plagia by the ciliate facial ridges. Eyes bare; front 

 about one-third width of head in %, face a little wider; frontal 

 bristles descending below base of third antennal joint, vertical and 

 next two, or next three pairs stronger than rest, directed backward, 

 others inward and decussate; no orbital bristles in %. Face re- 

 ceding, epistoma prominent; facial ridges ciliate fidly as high as 

 lower frontal bristles ; facial depression three-fifths or less width of 

 face, moderately deep; vibrissse strong, decussate, inserted distinctlv 

 above oral margin; sides of face moderately wide, bare; cheeks 

 about one-fourth eye-hight, more or less hairy. Proboscis about as 

 long as hight of head, not very stout, labella well developed ; palpi 

 slender, filiform, small. Aiiteiinte shorter than face, second joint a 

 little elongate, third about three or four times as long as sec(md ; 

 arista nearly bare, thickened on basal two-fifths, rather indistinctly 

 3-jointed, second joint not elongate; scutellum with an apical de- 

 cussate, and ti)ree lateral pairs of macrochietce. Abdomen elongate 

 oval, about same width as head and thorax, first segment hardly 

 shortened ; macrochretse only marginal. Legs long and bristly ; 

 claws and pulvilli of S elongate. Wings hardly longer than ab- 

 domen, with small costal spine, third vein bristly part way to small 

 cross-vein ; apical cell opening on front border of wing a good dis- 

 tance before tip ; fourth vein bent at an angle, with a long wrinkle 

 at bend, apical cross-vein more or less concave; hind cross-vein 

 straight or crooked, very oblique, nearer to small cross-vein than to 

 bend of fourth longitudinal. Type, P. valkla u. sp. 



Plagiprosplierysst valida n. sp. 'J,. — Eyes dark brown, frontal vitta 

 light yellowish brown, sides of front, face and cheeks silvery wliite, facial ridjres 

 pale yellowish ; oeellar area cinereons; anterior pair of oceliar bristles strongest, 

 directed forward and outward, vertical and next two pairs of frontal bristles 

 strongest, directed backward; antennie and arista blackish, second antennal 

 joint brownish yellow, first joint darker, third joint four times as long as the 

 somewhat elongate second joint; ])roboscis brownish, palpi yellowish: occiput 

 silvery, thickly gray-hairy, fringed with black hairs on orbital margin. Thorax 

 silvery, with a median pair of narrow dark vitt(E becoming obsolete beyond 

 suture, and a lateral heavier one obsolete in front, interrupted at the suture, 

 extending nearly to scutellum; scutellum silvery, tawny on apical portions. 

 Abdomen black, the bases of .segments two to four broadly silvery white; fii-st 



TRANS. AM. ENT. 80C. XIX. (15) MAY, 1892. 



