33 



42. Macrochii'tiv of second segment of abdoiiieii covering more than its apical lialf. 44. 

 Macrochicta' of second segineut, when present, confined to the apical fifth of this 



segment 43. 



43. Cheeks over one-third as Ijroad as the eye-height (p. 50) Myiophasia. 



Cheeks less than one-sixth as broad as tlie eye-height (]>. 124) IVinthemia. 



44. Tliird Joint of the antenna> almost straiglit on the front edge, the apex snbtrun- 



cated (p. 115) Ilombi/liomi/ia. 



Thirdjoiutstrougly convex on the front edge, tlic apex ronnded.(p. 147) JitrincUa. 



45. Posterior end of hind crossvein nearer to the margin of the "vving than to the 



small crossvein 46. 



Posterior end of liiud crossvein at least twice as far from the margin of the wing 

 as from the small crossvein, tliird joint of antenna^ less than three times as 

 long as the second (p. 78) Cyrtoi)hlaha. 



46. Facial ridges never bristly on more than the lowest fifth 47. 



Facial ridges bristly on at least the lower half, third joint of antennse about 



three times as long as the second, apical c( 11 open (p. ISti) Ga'diopsis. 



47. Last joint of antenn;e at least five times as long as the second 48. 



Last joint scarcely longer than the second, penultimate joint of arista broader 



than long (p. 125) Muscopferyx. 



48. Penultimate joint of arista at least three times as long as broad, third joint of 



antenna- of male divided lengthwise into two parts, two pairs of orbital bris- 



tHs in both sexes (p. 1,37) Dichocera. 



Penultimate joint at most slightly longer than broad, third joint of antenna? 

 entire, male destitute of orbital bristles (p. 126) Paradidyma. 



49. Ocellar bristles present 55. 



Ocellar bristles wanting 50. 



50. Vibrissa' inserted near lower edge of face 51. 



Vibrissa' inserted near the middle of the face, cheeks broader than the eye height. 



(p. 1.38) Microjihthalma. 



51. Sides of face destitute of macrochwta'. 52. 



Sides of the face each bearing two or three stout macrocha'ta' on the lower part. 



CT- (p. 140) Peleteria. 



52. Second segment of abdomen never bearing more than »»*• marginal macrochiTitae. 

 >M\rif-*yf' tXrs/' ^ cytSu^-Alfo ^^ot aifj^i-eti -"*■ (]). Ul) Archytas. 



Second segment of abdomen bearing at least twelve marginal macrocha'ta?.. 53. 



53. Palpi gradually thickening from the base outwardly, proboscis shorter than 



height of head 54. 



Palpi thickened on the apical three-fourths, proboscis beyond the basal articula- 

 tion atleast one and one-third times as long as height of head. . (p. 146) Dejeania. 



54. Outline of abdomen subquadrate, the apex deeply emarginato. 



(p. 146) Paradejeania, 

 Outline of abdomen conical, the apex not distinctly emarginato.. (p. 146) Jnniiia. 



55. The ocellar bristles directed obliquely forward 57. 



The ocellar bristles curving backward, very robust 56. 



56. Front opaque, the A-itta deep brown or black (p. 134) SpaUanzanla. 



Front shining, largely semitrausluceut yellow, the vitta light yellowish. 



(p. 132) Gotiia. 



57. Apical cell open, or, if closed, the petiole less than two-fifths as long as the hind 



crossvein 58. 



Apical cell closed, the petiole at least two-thirds as long as the hind crossvein. 



(p. 126) Phoricha'ta. 



58. Last section of fifth vein less than half as long as the preceding section 61. 



Last section of fifth vein almost as long as the preceding section, hind crossvein 



nearly midway between the small and the bend of the fourth 59. 



3359— No. 7 3 



