12 CATALOGUE OF NORTH AMERICAN DIPTERA. 



me to find them all, but I believe I have succeeded. I have seen no correct colla- 

 tion. Sometimes his Roman numerals stop and remain the same for several 

 papers, then again the numbering in " parts " becomes stationary while the other 

 goes on, and in two cases two papers have both the same (xxxvn, part 29, and 

 XLII, part 34). 



In the Bulletin the confusion is worse confounded. This publication appears 

 to have been for some time regularly published in two forms, one numbered in 

 Arabic, and the other differently paged in Roman. I am unable to decipher all 

 the peculiarities of this, but am obliged to refer partly to one, partly to the other, 

 and occasionally to separates, as my copies run, or as I find indications in the 

 references of others. I possess all the papers of the Annales series, and all but 

 two small ones of the Bulletin series; but the accumulation was the w^ork of ten 

 years. 



The work of Bigot should not be underestimated. He had a fine collection, 

 and his types are now the property of Mr. G. H. Verrall. It is only a question of 

 time until they will be elucidated; in fact, this has already been done for the 

 Calyptratae (excl. of Anthomyidae) by Brauer, and for the Pupipara by Speiser. 

 As the descriptions stand, it is often impossible to determine the species from 

 them alone. It is not unlikely that some of them have been assigned to synonymy 

 too hastily. 



Biologia Centrali-Americana. 



For convenience of reference, I give a complete collation of the parts of this 



great work. 

 Volume I. Cecidomyidse to Empidae. Pp. 1-216, 3 col. pi., by C. R. Osten 



Sacken. 

 Dates pp. 1-24, July, 1886; 25-48, Aug., 1886; 49-72, Oct., 1886; 73-104 



Nov., 1886; 105-128, Dec., 1886; 129-160, Jan., 1887; 161-176. Feb., 1887; 



177-208, Mar., 1887; 209-216, April, 1887. 

 Volume I, Supplement. Pp. 217-378, 3 col. pi. 



Mycetophilidae to Asilidae, pp. 217-332, by S. W. Williston. 



Dates pp. 217-248, Dec., 1900; 249-264, April, 1901; 265-^272, May, 1901; 



273-296, June, 1901 ; 297-328, Sept., 1901 ; 329-332, Dec., 1901. 

 Dolichopodidae. pp. 333 to 366, Dec., 1901, by J. M. Aldrich. 

 Empididae, pp. 366-376, Dec., 1901, by W. M. Wheeler and A. L. Melander. 

 List of Species Recorded since 1887, not enumerated in Suppl., 377, 378; 



Dec., 1901. 

 Volume II. Oestridae to Hippoboscidae. Pp. 1-432, 12 col. pi., by F. M. Van 



der Wulp. 

 Dates pp. 1-40, April, 1888; 41-56, Jan., 1890; 57-88, Feb., 1890; 89-112, 



Mar., 1890; 113-144, May, 1890; 145-176, June, 1890; 177-200, Aug., 1890; 



201208, Nov., 1890; 209-224, April, 1891; 225-248, May, 1891; 249-264, 



July, 1891; 265-272, Dec., 1895; 273-280, Jan., 1896; 281-288, March, 1896; 



289-304, May, 1896; 305-312, June, 1896; 313-320, Oct., 1896; 321-344, 



Dec., 1896; 345-36o, Sept., 1897; 361-368, Nov., 1897; 369-376, Dec., 1897; 



377-384, Oct., 1898; 385-392, Feb., 1899; 393-408, Sept., 1899; 409-416, 



Dec., 1899; 417-428, Feb., 1900; 429-432, Apr., 1903. 

 Volume II, Supplement. Pp. 433-486, i col. pi. Oestridae and Tachinidae, by 



F. M. Van der Wulp. 



Dates pp. 433-436, April, 1903; 437-486, May, 1903. 

 List of Species described since 1888, not enumerated in Vol. II., pp. 486-489, 



May, 1903. 



