FAMILY BORBORID.E 361 



The North American species have been monographed by Spiiler.* 

 Here is one of the best examples of the short sighted policy of Entomo- 

 logical publications in refusing to accept long papers and Spuler's 

 woi'k lias lost much of its value. The work appeared in seven different 

 journals (of various sized pages) and in nine parts and the entire 

 sequence has been lost. 



KEY TO GENERA 



1. Wings and halteres present 2 



Wings and halteres absent Aptilotus Mik 



2. Mesonotum and scutellum with bristles 3 



Mesonotum and scutellum without bristles (1) Sphaerocera Latreille 



3. Fourth vein reaching the margin of the wing 4 



Fourth vein not nearly reaching the wing margin (2, 3, 4). 



Leptocera Olivier 



4. Posterior tibise with an apical spur below (5, 6, 7) Borborus Meigen 



Posterior tibiae without apical spur (8) Scatophora Desvoidy 



* 1923, Proc. Acad. Nat. Sci. Phila., Ixxv, pp. 369-378; 1924 (Leptocera, part). Psyche, 

 xxxi, pp. 121-134; 1924, (Leptocera, part) .'Vnn. Ent. Soc. Amer., xvii, pp. 106-116; 1924, 

 (Sph»rocera and Aptilotus), Pan. Pac. Ent., i, pp. 66-71 ; 192.5, (Leptocera, part). Can. Ent., 

 Ivii, pp. 99-104, 116-124; 1925, (Leptocera, part), Journ. N. Y. Ent. Soc, xxxiii, pp. 70-84. 147- 

 162; 1925, (Borborus and Scatophora), Bull, Brooklyn Ent. Soc, xx, pp. 1-16. 



