ART. 12 KEYS TO SAPROMYZIDAE MALLOCH AND McATEE. 21 



13. Arista plumose ; the fuscous spot on middle of ultimate section of third vein 



of wing separated from the one at apex of second and much distad of the 

 outer cross-vein ; hypopygium as in Figure 19 philadelphica Maequart. 



Arista short haired ; the spot at middle of ultimate section of third vein 

 connected witli the one at apex of second and directly above outer cross- 

 vein ; hind femur without preapical anteroventral bristle, 



conjuncta Johnson, 



Arista short haired; wing marlvings us in conjucta; hind femur with at 

 least one long preapical anteroventral bristle citreifrons Malloch. 



14. Thorax without differentiated acrostichals except the prescutallar pair; 



base of third vein pale ; hind femur without an outstanding preapical 



anteroventral bristle; hypopygium as in Figure 22 conjuncta Johnson. 



Thorax with well differentiated acrostichal bristles 15 



15. Hind femur of male without an outstanding bristle near apex on antero- 



ventral surface; base of third vein dark brown, much darker than the 

 remainder of vein; two pairs of acrostichals proximad of anterior pair 

 of dorsocentrals, the anterior pair much weaker than the second, 



fuscibasis Malloch. 

 Hind femur with an outstanding bristle near apex on anteroventral surface 

 in both sexes; base of third vein not darker than remainder of vein; one 

 very strong pair of acrostichals proximad of the anterior pair of dorso- 

 centrals proximad of which there are no well-developed bristles, 



incerta Malloch. 



16. Wing with both cross-veins broadly infuscated, the infuscation extending 



well onto the membrane 17 



Wing with the cross-veins not noticeably darker than tlie others; if so, the 

 infuscation does not extend onto the membrane IS 



17. Male with anteroventral and anterior surfaces of hind tibia and anterior 



surface of basal segment of hind tarsus with long, soft, erect hairs; the 



last abdominal sternite with an apical series of short black setulae ; 



hypopygium as in Figure 23 nubilifera Malloch. 



.Male without soft, erect hairs on hind tibia and tarsus; last abdominal 



sternite with a few weak hairs apically nubila Melander. 



IS. Males 19 



Females 29 



19. Hind femur with a large number of short setulae on basal half of ventral 



surface ; cheek over half as high as eye ; hind tibia without erect, soft 



hairs littoralis Malloch. 



Hind femur without black setulae on basal half of ventral surface 20 



20. Hind tibia without erect, .soft hairs ventrally 21 



Hind tibia with some soft, erect hairs ventrally 25 



21. Claws of mid tarsus unequal in size, the anterior one distinctly larger than 



the posterior, and peculiarly curved ; cheek about half as high as eye ; 



hairs on lower half of back of head and on cheek pale harti Malloch. 



Claws of mid tarsus equal in length, with the normal curvature 22 



22. Hind femur without a preapical bristle on anteroventral surface; sixth 



tergite of abdoment fully twice as long as fifth 23 



Hind femur with a distinct preapical anteroventral bristle 24 



23. Arista pubescent ; hind femur with some fine, short hairs apically on poster- 



oventral surface inaequalis Malloch. 



Arista shoi-t haired; ventral surfaces of hind femur entirely bare, 



nudifemur Malloch, new species. 



