SCENOPINIDAE OF THE WORLD 7 



The taxonomist is, therefore, cautioned to check carefully the 

 figures and descriptions of specimens which run through the keys. 

 Unless the specimen comes from near the type area, it should be 

 checked critically to see that it fits all the characteristics, as most 

 species have only a limited distribution. For positive identification, 

 the internal structures both of male and female should be checked 

 against the figures. 



In the follo^\•ing classification, the species have been grouped into 

 genera on the basis of all available characters with particular em- 

 phasis on the genital characteristics which have not previously been 

 used for identification of members of this family. 



All males of this family examined to date have an internal ejacula- 

 tory syringe surrounded by accessory organs and apodemal structures 

 to support the muscles of theejaculatory syringe and aedeagal extensors. 



The females of Scenopinus are difficult to separate except by internal 

 genitalic structures or the conformation of the eighth sternum; the 

 shape of the bursal cavity is extremly helpful in identification. 



In no case except S. niger has a male been examined where the eye 

 was not divided into an upper portion with larger facets and a lower 

 portion with smaller facets. In almost all cases, the lower portion of 

 the eye appears darker than the upper part. All females have eyes 

 wdth uniform facets in their make-up. 



Systematic Arrangement 



Genus Scenopinus Latreille 



FENESTRALIS group 



1. albicomus, new .species cf Tuni.sia 



2. antennatus (Krober) 1914b, p. 74. (Omphrale) cf Algeria 



'.i. aquelonius, new species 9 British Columbia, 



Canada 



4. breviterminus, new species cf 9 Calif., U.S. 



5. cavifrons (Krober) 1937, p. 231. (Omphrale) 9 Canada 



6. efflatouni, new species 9 Egypt 



7. fenestraUs (Linnaeus) 1758, p. .597. (Musca) c? 9 Worldwide 



8. glabrifrons Meigen 1824 p. 114. d^ 9 Europe; N. Africa; 



N. America; 

 Australia 



9. griseus (Krober) 1913, p. 191. (Omphrale) cf Hungary 



10. japonicus (S6guy) 1920, p. 318. (Omphrale) 9 Japan 



11. lesinensis Strobl 1902, p. 474. 9 Austria 



12. microgaster (S6guy) 1948, p. 1.5."). (Omphrale) cf 9 China 



13. nidorcaupulus, new species 9 Colo., U.S. 



14. niger (DeGeer) 1776, p. 188. (Nemotelus) cf 9 Europe 



15. opaculus Loew 1873, p. 145. (f 9 Samarkand (U.S.S. R.) 



16. physadius (Seguy) 1930, p. 111. (Omphrale) d' 9 Morocco 



