NORTH AMERICAN DIPTEKA. 99 



prominent, one-tliird or more width of lieiul in S , and al)out three- 

 eighths in 9 , slightly narrowed anteriorly, face about one-half wider; 

 frontal bristles in a single row, descending only to base of antennae, 

 all about equal, except two vertical bristles, which are strongest and 

 directed backward, the rest mostly directed inward and decussate; 

 three orbital bristles in % and 9 , the ])osterior one directed back- 

 ward. Face receding, epistoma somewhat prominent ; facial depres- 

 sion about two-fifths width of face, a little widened below, more or 

 less elongate-oval in outline, moderately deep; facial ridges bare, 

 except two or three bristles above vibrisste, a little constricted con- 

 siderably above oral margin ; sides of face wide, bare or clothed 

 with microscopic bristles ; cheeks wide, fully one-third eye-hight, 

 bare excei)t bristles on lower border and fine hairs posteriorly ; vi- 

 brissas not long, moderately stout, decussate, inserted well above oral 

 margin. Eyes bare, descending about four-fifths as low as oral 

 margin. Antennae much shorter than face, inserted hardly above 

 line through middle of eyes, first joint short, second a little elongate, 

 bristly, third from two and one-half ( 9 ) to three ( S ) times as long 

 as second, rather narrow, posterior apical corner rounded ; arista 

 moderately long, microscopically jnibescent, thickened fully half its 

 length, 3-jointed, first two joints short. Proboscis little more than 

 half as long as hight of head, moderately stout, labella well devel- 

 oped ; palpi rather slender, somewhat thickened at tip, more or less 

 curved, bristly. Thorax usually a little narrower than head; scu- 

 tellum with a very short, decussate apical pair of macrochsetre; a 

 long subapical pair reaching to middle of second abdominal segment, 

 and a shorter lateral pair. Abdomen not wider than thorax, rather 

 elongate-conical, somewhat vaulted ( S ), first segment not shortened; 

 macrochietiie only marginal; hypopygium of % exserted. Legs mod- 

 erately short, not very bristly, femora stout, especially in % ; claws 

 and pulvilli of S elongate, of 9 either short. Wings about as 

 long as abdomen, without costal spine, third vein spined part way 

 to small cross-vein ; apical cell opening on front border of wing a 

 good distance before tip; fourth vein bent at an acute or right angle, 

 with a more or lesg distinct wrinkle at bend, ajjical cross-vein strongly 

 bent in; hind cross-vein oblique, not straight, nearer to bend of 

 fourth vein. Type, E. decens n. sp. 



Ell macrony cilia decens n. sp. 'J,. — Eyes dark brown; front, face, 

 sides of face and cheeks silvery white, frontal vitta, alioiit half width of front, 

 pale brownish yellow ; front pair of ocellar bristles longest, directed forward and 



TRANS. AM. ENT. 80C. XIX. MAY, 1892. 



