V".lyr'>*-c 



32 



25. Bend of fourth vein furnished with a long appendage, hind crossvein unusually 



oblicjue, lowest frontal bristles directed downward, proboscis thick, fleshy, 



labella large (p. 78) I'laijia. 



Bend of fourth vein destitute of an appendage, hind crossvein nearly at right 

 angles to the fourth vein (p. 118) HoiKjhia. 



26. Fourth vein ending at or close 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) Stphoiilagla. 



27. Third vein bristly at least almost to the small crossvein, proboscis at nu>st only 



slightly longer than height of head 28. 



Tiiird vein bristly on less than oue-thinl of the distance from its base to the 

 small crossvein, ])roboscis twice as long as height of head.. (p. 74) /•Jpit/riiniiia. 



28. Arista pubescent, the longest scarcely half as long as the greatest diameter of 



the arista 29. 



Aristai bearing short hairs, the longest of which are slightly longer than its great- 

 est diameter (p. 67; LetiJdomima. 



29. Frontal vitta next the antenna' nearly four times as wide as either shle of the 



front, third vein never bristly to the small crossvein, scutelluni bearing only 



two pairs of long marginal macrocha-ta' (p. 59) Lanioiieura. 



Frontal vitta next the antenna' nt most twice as wide as either side of the front, 

 third vein bristly almost to its tip, scutellum bearing three pairs of long mar- 

 ginal macrocha^taj (p- 58) Aciia. 



30. Face on the lower half of its sides hare 79. 



Face hearing macrocha-ta; or bris t ly hairs on at least a portion of the lower half 



of its sides 31. 



31. Tip of apical cell far before the extreme tip of wing 40. 



Tip of apical cell at or close to the extreme tip of wing, proboscis beyond the 



hasal articulation at most only slightly longer than height of head 32. 



32. Abdomen siibopaciue, partly or wholly covered with grayish pollen 33. 



Abdomen largely or wholly shining and destitute of pollen.. (p. 50) Myiopliasia. 



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. t^.>r^VwfcCe^6<:6;^^>.^.'.'<4':.(p. 52) Enlusiona. 



34. Frontal bristles to the number of from one to three pairs heneath hase of anten- 



na'; antenuie at least three-fourths as long as the face 37. 



Frontal bristles not descending heneath base of autennie ; antenuje less than two- 

 thirds as long as face, cheeks two-thirds as hroad as eye-height, .(p. 51) Phyto. 



35. 36. (Omitted.) 



37. First posterior cell open, or, if closed, short petiolate 38. 



First posterior cell closed and long petiolate, the petiole as hmg as the hind 



crossvein, third vein bristly almost to the small crossvein. . .(p. 51) Mnuromyia. 



38. Third vein never bristly on more than one-fourth of the distance from hase to 



small crossvein, i\\ i \eH of faoo duntituto of niaoro rltrrtirf 39. 



Third vein bristly at least three-fourths of distance from hase to the small cross- 

 , vein, sides of face hearing macroch;et;i' I^VWu6Cg^^^v^»a^», {v-Ts ^ C e inioiujfivVa. - 

 Va r- p , 111 profile otningfy miuvoiL, nrb Ual ftnstles usually present in botft sext 



tia. 



slender 



in both sexes (p. r,2)J'r>i2)tomei(j('n ia. 



40. Eyes bare, or with indistinct short sparse hairs .y. 49. 



Eyes distinctly hairy -y:- ^ 1 • 



41. Sides of face bearing stout macrochn'ta', at least- near 'uyviAffcnd of each eye.. 45. 

 Sides of face destitute of niacrochieta; .^^^^.,,<<\. 42. 



V/k 4 ),.^ frcmt tarsi ()neiiiale jieuerally dilated. ^.-^^rf^'TT/.^y/t'A 'fp. 53) AAnumtic 

 WviVi in pToTilfc mnu'ave. orbital bnstSes wanting lu the male, front tarsi sleude 



^lff>^ € t-^^e-v-v;.^/:*. ^. /^ . ^SJsrjy), kyx ^^^' 



