TACHINID^E. 36- 



44. Kyes distinctly hairy 45 



Eyes bare, or with indistinct, short, sparse hairs. . . 50 



45. Frontal bristles usually not descending below base of second an- 



nal joint; abdomen largely or wholly opaque gray pollinose. 46 



Frontal bristles descending below middle of second antennal 



joint. ........... 48 



46. Cheeks nearly as broad as the height of eyes. Hyalurgus,* 

 Cheeks less than one-half as broad as eye-height. . , 47 



47. Third vein bristly to anterior cross-vein. . Ptilodegeeria. 

 Third vein not bristly to anterior cross-vein (65). Macquartia. 



48. Body shining, without pollen Polidea. 



Body partly or wholly opaque pollinose. .... 49 



49. Hind tibiae outwardly fringed with nearly equal bristles. 



Metachseta. 

 Hind tibiae fringed with unequal bristles (51). . Didyma. 



50. Sides of face at narrowest part at most one-third as wide as the 



median depression. ........ 52 



Sides of face one-half as wide as median depression. . . 51 



51. Fourth vein obliterated beyond the bend. . Racodineura. 

 Fourth vein not obliterated beyond bend. . . . Clista. 



52. Head at vibrissae shorter than at root of antennae. . . 55 

 Head at vibrissas as long as at root of antennae. ... 53 



53. Arista pubescent (112). Leskia. 



Arista not pubescent. ........ 54 



54. Abdomen elliptical, conical or ovate (36). . . Anisia. 

 Abdomen rounded. . . ... Sphaerina. 



55. Horizontal diameter of the occiput above the neck, less than one- 



half as great as that of the eye. ..... 56 



Horizontal diameter of the occiput above the neck as great as that 

 of the eye; antennae reaching at least the lowest fifth of the face; 

 vibrissa; on a level with oral margin (compare Hypostena). 



Pelatachina. 



56. Front of male destitute of orbital bristles; venter of female abdo- 



men without short spines; third vein with at least two bristles 



near its origin Hypostena. 



Front in both sexes with orbital bristles. .... 57 



* H. Johnsoni is a true Macq uartia; I have examined the type. — w. 



Fig. 150. Taehinidae. 42, Atrophopoda hraueri, head; 43, id, front tarsus of 

 female; 44, Vanderwulpia townsendi, wing; 45, Atrophopoda hraueri, front tar- 

 sus of male; 4(5, Eucnephalia gohiodes, head; 47, Beskia cornuta, wing; 48, 49, 

 indet.; 50, Phorocera puer, head- 51, Didyma calyptra, head; 52, Atrophopoda 

 hraueri, wing; 53, Vanderwulpia townsendi, head and arista; 54, Oryptera sp. 

 head; 55, Sciasma nebulosa, wing; 50, Gymnochceta sp. head; 57, Exorista 

 nohilis, head; 58, 59, Penthosia satanica, head, wing; 00, Paradejeania, sp. 

 (Brazil), head; 01, Elachipalpus, sp. head; 02, Heteropterina nasoni, wing; 

 03, 04, Ervia triquetra, wing, head; 05, 00, Macquartia pristis, wing, head; 07, 

 68, Leucostoma senilis, wing, head. 



