to 
i 
29: 
34. 
) 
35, 
37. 
38. 
30. 
40. 
41. 
32 
Bend of fourth vein furnished with a long appendage, hind crossvein unusually 
oblique, lowest frontal bristles directed downward, proboscis thick, fleshy, 
labelladargesrs2s i222: e225 fag Sse tee sees ee eee eee (p. 78) Plagia. 
Bend of fourth vein destitute of an appendage, hind crossvein nearly at right 
QUINOVSS Wu Oi LNG EO VTL ENG LN ee ee eee (p. 118) Houghia. 
Fourth vein ending at or close to the extreme tip of wing -----.-.----.--.-- ie 
Fourth vein ending less than halfway from tip of second vein to the extreme tip 
of wing, proboscis slender, labella very small, lowest frontal bristles directed 
UY a3) 6 be Se eee cetera ice et ee ame Romie SR A as (p. 78) Siphoplagia. 
. Third vein bristly at least almost to the small crossvein, proboscis at most only 
slichtly longer thangherehition head) se2— see ese = ees ee ee eee 28. 
Third vein bristly on less than one-third of the distance from its base to the 
smali crossvein, proboscis twice as long as height of head..(p.74) Hpigrimyia. 
Arista pubescent, the longest scarcely half as long as the greatest diameter of 
CHOWTISHA sesso se S2 a5 js Hist che See ws oxote SEE See wees eee eee eee eee 29. 
Arista bearing short hairs, the longest of which are slightly longer than its great- 
eStrditimeters 2 sc. faests oc. eceters So eee ieee seese eee ae (p. 67) Leskiomima. 
Frontal vitta next the antennie nearly four times as wide as either side of the 
front, third vein never bristly to the small crossvein, scutellum bearing only 
two pairs of long marginal macrochietw ...-..-.---...----- (p. 59) Lasioneura. 
Frontal vitta next the antennze at most twice as wide as either side of the front, 
third vein bristly almost to its tip, scutellum bearing three pairs of long mar- 
eumalomacrocheebes acco S22)2 sere sors oes aia eee ae ee nee eee (p. 58) Actia. 
Kace‘on the lower half of 1ts sides bare.22-- -22--2 == se = eee oy 
“ace bearing macrochiete or bristly hairs on at least a portion of the lower half 
OL Abs SIMS Y® <.a.2. Seco see see Seis oes Salsas eee a cee eee eee 31. 
. Tip of apical cell far before the extreme tip of wing. .---- epee seeoGsen 6545 + 40. 
Tip of apical cell at or close to the extreme tip of wing, proboscis beyond the 
basal articulation at most ouly slightly longer than height of head... ----. 32. 
Abdomen subopaque, partly or wholly covered with grayish pollen. ....---- 33. 
Abdomen largely or wholly shining and destitute of pollen--(p. 50) Myiophasia. 
Eyes bare, or with indistinct, short, sparse hairs....-------------.---------- od. 
Eyes distinctly hairy, antennie as long as the face, facial ridges never bristly 
OMsmMore thainethelowestetouinb hisses eres eer eea= eee aes (p. 52) Lulasiona. 
Frontal bristles to the number of from one to three pairs beneath base of anten- 
ne; antenne at least three-fourths as long as the face---....--.-----.----- 31s 
Frontal bristles not descending beneath base of antennie ; antennie less than two- 
thirds as long as face, cheeks two-thirds as broad as eye-height.-(p.51) Phyto. 
36. (Omitted. ) 
First posterior cell open, or, if closed, short petiolate... --. w 2s oc Seats So eeOSe 
First posterior cell closed and long petiolate, the petiole as long as the hind 
crossvein, third vein bristly almost to the small crossvein...(p.51) Mauromyia. 
Third vein never bristly on more than one-fourth of the distance from base to 
small crossvein, sides of face destitute of macrochietie .....-..--.-------- --39. 
Third vein bristly at least three-fourths of distance from base to the small cross- 
vein, sides of face bearing macrochete-..-...----..------ (p. 52) Ceratomyiella. 
Face in profile strongly convex, orbital bristles usually present in both sexes, 
front tarsi of female generally dilated. -.--...-.-----------.- (p. 58) Admontia. 
Face in profile concave, orbital bristles wanting in the male, front tarsi slender 
Toy |oYoWelisfep(sie oaa- - Soes esses as scsy cfcane chaoao csocess (p. 52) Cryptomeigenia. 
Eyes bare, or with indistinct short sparse hairs. --....--------------------- - 49. 
Eyes distinctly hairy ..----: $e SE ie cc cians ePID ae eeeaee bebe cts Sees eee Al, 
Sides of face bearing stout macrochetie, at least near iower end of each eye.. 4d. 
Sides of face destitute of macrochete ..-.--.----------:---:--- scReeeaceee eee 
