Vol. XXI] ENTOMOLOGICAL NEWS. 225 



a little, but the material within my reach is far too meagre to 

 enable me to form a satisfactory conclusion. 



Probably Melander and Brues examined more material in 

 the genus than has been accessible to any other dipterists, as 

 in their two years' stay in Texas they collected about a hun- 

 dred specimens, most of which they distributed in exchange. 

 Out of this number, a single one was classified as Icntum, all 

 the rest as marginatum. I am indebted to Prof. Melander for 

 this suggestive item. 



(a) Say, Jour. Acad. Nat. Sci. Phil., VI, 167, 1829; reprinted in Com- 



plete Works, II, 360. 



(b) Macquart, Dipt. Hxotiques, Suppl. I, 252 (sep. 124), 1846; pi. X, 



fig. 1 6. 



(c) Osten Sacken, Western Dipt., 333, 1877. 



(cl) Osten Sacken, Catalogue of N. A. Diptera, 2d edition, 18/8, 130. 



(e) Williston, Synopsis N. A. Syrphidae (Bull. 31, U. S. Xatl. Mus.), 



151, pi. VII, f. i ; 1886. 



(f) Williston, Biologia Cent. Amer., Dipt. Ill, 56, 1891. 



(g) Williston, Entomological News, II, 162, 1891. 



(h) Giglio-Tos, Boll. Mus. Zool. Anat. Comp. R. Univ. Torino, VII, No. 



123, p. 2; 1892. 

 (i) Giglio-Tos, Ditteri del Messico (Mem. R. Acad. Sci. cli Torino, ser. 



II, torn. XLIII, 1892), 40-43, pi. I, f. 14, 15. 

 (j) Townsend, Proc. Cal. Acad. Sci., 2d ser., IV, 612-616, 1895. 

 (k) Townsend, Trans. Amer. Ent. Soc., XXII, 42-45, 1895. 

 (1) Townsend, Psyche, 1898, 267. 

 (m) Snow, Suppl. List N. A. Syrph. (Kans. Univ. Quart., Ill, 1895), 



257- 



(n) Aldrich, Catalogue N. A. Diptera (Smithsonian. 1905), 376. 



DR. EDWIN C. VAN DYKE and DR. F. E. BLAISDELI., of San Erancisco, 

 expect to make a collecting trip to the high middle Sierras of Califor- 

 nia. Coleoptera are warned to steer clear of the district they visit. 



THE LAKE LABORATORY of the Ohio State University, located on 

 Cedar Point, near Sandusky, will open June 20, and close July 29. The 

 laboratory is close to the waters of Lake Erie and Sandusky Bay. 

 There will be a course on entomology. Any information may be ob- 

 tained from Prof. F. L. Landacre, Ohio State University, Columbus, 

 Ohio. 



