76 C. H. TYLER TOWNSEND. 



descending almost to base of third antennal joint ; vertical bristles 

 strongest, and, with next two pairs, directed backward, othei-s inward ; 

 two orbital bristles in the female. Face nearly perpendicular, epis- 

 toma prominent ; facial ridges bare ; sides of face not wide, bare ; 

 cheeks about as wide as one-third the eye-height, bare ; vibrissse in- 

 serted almost on oral margin. Eyes bare. Antennte not quite as long 

 as face, second joint a little elongate ; arista pubescent, thickened on 

 basal half, indistinctly 3-jointed, second joint not elongate ; proboscis 

 rather slender, considerably longer than height of head, labella con- 

 siderably developed ; pal})i unusually large, club-shaped, elongate, 

 extending one-third their length beyond the ei)istoma, much thick- 

 ened at tip. Thorax about as wide as head ; scutellum with a sub- 

 apical pair of macrochtttie, which aie not decussate, and a lateral 

 pair, besides several very weak ones. Abdomen a little wider than 

 thorax, bi'oadly rounded, first segment har ily sliortened ; macrochsetse 

 only marginal. Legs somewhat elongate, not very bristly. AVings 

 longer than abdomen, without costal spine, first vein spined its whoie 

 length, third vein spined as far as the small cross-vein ; apical cell 

 ending in the apex of the wing, open ; fourth vein bent at a curve, 

 without stump or wrinkle ; hind cross-vein a little nearer the bend 

 of the fourth vein, apical cross-vein slightly concave. Type, M. 

 diadema Wd. 



83. Myobia diadema Wicd. % . 



Eyes cinnamou-browu ; front liglit yellow, frontal vitta same color ; face and 

 cheeks whitish, the sides of face with a golden tinge; cheeks with some bristles 

 ou lower border; antennae orange-yellow, dark brownish at tip, joint with a long 

 bristle before ; arista dark brown ; proboscis yellowish, palpi orauge-yelloA', 

 clothed with short black bristles ; occiput whitish below, cinereous above, except 

 vertex, which is yellowish, sparsely clothed with gray hairs, fringed with some 

 black bristles above. Thorax dark cinereous with a jiair of narrow, black, me- 

 dian vittie becoming obsolete at the suture, and a longer, lateral vitta interrupted 

 at the suture; humeri and pleurae yellowish; scutellum yellowish. Abdomen 

 clothed with short, t)lack, bristly hairs: first segiuent yellowish, second segment 

 yellowish, except median portion and hind borders, last two segments brownish 

 yellow ; first segment with a very small median marginal pair of macrochsetsc. 

 and some lateral bristles on sides; second segment with a median marginal pair 

 and a lateral pair, third segment with eight or more marginal, and last segment 

 with six or more marginal macroclifetfe ; venter light yellowish at base, darker at 

 ti]), anus blackish. Legs with a few sjjarse bristles, light yellowish except tarsi, 

 which are blackish ; first tarsal joint much elongated ; claws and pulvilli short. 

 Wings grayish hyaline, the portions along wing-veins tinged with yellowish ; 

 tegulje light yellowish, especially on borders; halteres light yellowish. Length 

 of body, 7 mm. ; of wing, about 6 mm. 



Described from one specimen, Ithaca, N. Y. (Comstock), July 19. 



