32 
25. Bend of fourth vein furnished with a Long appendage, hind crossvein unusually 
oblique, lowest frontal bristles directed downward, proboscis thick, fleshy, 
labella large (p. 78) Playia. 
Bend of fourth vein destitute of an appendage, hind crossvein nearly at right 
angles to the fourth vein (p. 118) Houghia. 
20. Fourth vein ending at or (lose to the extreme tip of wing 27. 
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 
upward (p. 78) Siphoplagia. 
27. Third vein bristly at least almost to the small crossvein, proboscis at most only 
slightly longer than height of head 28. 
Third vein bristly on less than one-third of the distance from its base to the 
small crossvein. proboscis twice as long as height of head. .(p. 74) EpigHmyia. 
28. Arista pubescent, the longest scarcely half as long as the greatest diameter of 
the arista 29. 
Arista bearing short hairs, the longest of which are slightly longer than its great- 
est diameter (p. 67 j Leskiomima. 
29. 1'rontal \itta next the antennas nearly four times as wide as either side of the 
front, third vein never hristh to the small crossvein, scntelliim bearing only 
t wo pairs of long marginal macrocha-ta- (p. 5!)) La8ioneura. 
frontal \ittane\t the antenna' at most t w ice as wide as either side of the front, 
third vein bristly almost to it> tip. scutellum bearing three pairs of long mar- 
ginal raacrochaetae (p. 58) Acti<(. 
30. Face on the lower half of its sides hare 79. 
Face bearing macroch.et.-e or brist ly hairs on at least a portion of the lower half 
of its sides 31. 
31. Tip of apical cell far before the extreme t ip of wing 40. 
Tip of apical cell at or close to the extreme tip of wing, proboscis beyond the 
basal articulation at most only slightly longer than height of head 32. 
32. Abdomen subopaque, partly or wholly covered with grayish pollen 33. 
Abdomen largely or wholly shining and destitute of pollen. .(p. 50) Myiophasia. 
33. Eyes bare, or with indistinct, short, sparse hairs 34. 
Eyes distinctly hairy, antenna' as long as the face, facial ridges never bristly 
on more than the lowest fourth (p. 52) lUtlasiona. 
31. Frontal bristles to the Dumber of from one to three pairs beneath base of anten- 
na'; antenna- at least t hree- fourths as long as the face 37. 
Frontal bristles not descending beneath base of antenna- ; antenna- less than two- 
thirds as long as face, cheeks two-thirds as broad as eye-height. . (p. 51) I'hyto. 
35, 36. (Omitted.) 
37. First posterior cell open, or, if closed, short petiolate 38. 
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. 
38. Third vein never bristly on more than one- fourth of the distance from base to 
small crossvein, sides of face destitute of macrocha-ta- 39. 
Third vein bristly at least three-fourths of distance from base to the small cross- 
vein, sides of face bearing macrocha-ta' (P-52) Ceraiomyiella. 
39. Face in profile strongly convex, orbital bristles usually present in both sexes, 
front tarsi of female generally dilated (p. 53) Admontia. 
Face in profile concave, orbital bristles wanting in the male, front tarsi slender 
in both sexes (p. 52) Cryptomeigcnia. 
40. Eyes bare, or with indistinct short sparse hairs 49. 
Eyes distinctly hairy H« 
41. Sides of face bearing stout macrochajtaj, at least near lower end of each eye.. 45. 
sides of face destitute of macrochietaj ------ • -- 42. 
