128 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Genus Melanosoma Robineau-Desvoidy 



Melanosoma Robineau-Desvoidy, Bull. Soc. Sci. Yonne, vol. 7, pp. 92, 122, 1853. 



Melanosoma pallipes (Wiedemann) 



Myopa pallipes Wiedemann, in Meigen, Systematische Beschreibung der bekann- 

 ten Europaischen zweiflugeligen Insekten, vol. 4, p. 149, 1824. 



This species has been previously known from Europe to Central 

 Asia. 



Material examined: Shantung: Tsinan, Apr. 18, 1922, A. P. 

 Jacot, 1 male, USNM. 



Genus Sicus Scopoli 



Sicus Scopoli, Entomologia carniolica . . ., p. 369, 1763. 



Sicus abdominalis Krober 



Sicus ferrugineus var. abdominalis Krober, Arch. Naturg., vol. 81, Abt. A, Heft 1, 

 p. 88, 1915. 



This species differs from S. ferrugineus by having a shorter and 

 wider abdomen, and by having a larger distinct theca in the female. 

 I feel certain that Krober's type is a specimen having the abdomen 

 flexed so that difference of the theca horn ferrugineus is not apparent. 



The illustrations by Ouchi (Journ. Shanghai Sci. Inst., sec. 3, 

 vol. 4 (1939), p. 211, 1940) show the differences between this and 

 the other species. This species is shown as S. fusenensis var. a and 

 var. b. The difference between variety a and b is simply that in 

 variety a the abdomen is extended, and in variety b the abdomen 

 is flexed. 



In this species, when viewed from above, the second abdominal 

 segment is as long or somewhat longer than wide, and the third 

 abdominal segment is wider than long. In ferrugineus, the second 

 abdominal segment is much longer than wide, and the third abdominal 

 segment is as long or longer than wide. In the female sex the abdomen 

 is even more elongated in ferrugineus, and the differences between the 

 two species are greater. 



The series from Szechwan differs from the specimens from Siberia 

 and Manchuria by averaging smaller, and by being paler and more 

 pollinose. Also the latter have a pair of curved black marks on the 

 second abdominal segment. These black marks, however, are present 

 or absent in my series of ferrugineus from Europe, which includes a 

 very dark male with the femora predominantly blackish. 



Occemyia ogumae Matsumura (Thousand insects of Japan, Addit- 

 amenta 2, p. 273, 1916) may be this species. The illustration shows 

 the black marks on the second abdominal segment. 



Material examined: Szechwan: Suifu, D. C. Graham, 3 males, 1 

 female, USNM and author's collection; Suifu, 1,000-1,500 ft., June 



