FAMILY DOLICHOPID.K — TIIE LOXG-IIEADED FLIES 225 



61. Abdomen long and slender, more or less cylindrical, the jjenitalia 



small (42, 53) *Sympycnus Lcew 



Abdomen either tapering or short with large, asymetrical hypopy- 

 gium 62 



62. Abdomen tapering; genitalia small; scutellum without secondary basal 



bristles 1 euchophorus Lcew 



Abdomen short and chunky, the genitalia large, asymetrical (Kopho- 

 soma Van Duzee, Pachypyga Parent) (8, 33) . . .fPeloropeodes Wheeler 



63. Third and fourth veins rather approximate apically (12). 



JNematoproctus Lcew 

 Third and fourth veins almost parallel beyond the crossvein (10). 



Keirosoma Van Duzee 



Females 



64. Costa continuing to the fourth vein 65 



Costa ending at the third vein (58) §Asyndetus Lcew 



65. Pteropleura produced to form a mammiform protuberance in front of 



the posterior spiracle (27, 28) Scellus Lcew 



Pteropleui'a not produced 66 



66. First antennal segment haired above 67 



First Antennal segment bare above 80 



67. Arista plumose or very long pubescent 68 



Arista short pubescent or bare 70 



68. No acrostical setulae Phylarchus Aldrich 



With acrostical setulae 69 



69. Face wide, bulging below (22, 25, 46, 77) Pelastoneurus Lcew 



Face narrower, never strongly bulging below the middle (66, 79). 



Sarcionus Aldrich 

 ^Leptocorypha Aldrich 



70. Arista dorsal 72 



Arista apical 71 



71. Third antennal segment subtriangular or triangular (18, 74). 



Argyra Macquart 

 Third antennal segment either furcate or with a strong, angular pro- 

 jection basally (30, 40) Hypocharassus Mik 



72. Propleura with hair or a single bristly hair on the median portion ... 73 

 Propleura entirely bare on the median portion (5, 34) . . .Diostracus Lcew 



73. Pteropleura with a small tuft of very fine short hairs in front of the 



posterior spiracle (these are sometimes difficult to discern in most 

 views); fourth vein not curved forward near the apex (55, 70). 



Gymnopternus Loew 

 Without such hairs, or the fourth vein strongly curved forward 

 apically 74 



* Van Duzee, 1930. Pan-Pac. Ent., vii, pp. 35-36. 



t Van Duzee, 1926, Tr. Amer. Ent. Soc, Hi, pp. 39-46 (Kophosoma). 



J Van Duzee, 1930, Psyche, xxxvii. p. 167. 



§ Van Duzee, 1919, Ent. News, xxx, p. 248. 



H Female unknown. 



