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SOURCES FROM WHENCE OUR MATERIAL WAS OBTAINED. 
Tue following particulars as to the sources from whence our material was obtained 
supplement the account given in the Introduction, antea, pp. 11,12. In Volumes I. 
of the ‘Aves’ and of the ‘Lepidoptera Rhopalocera’ the names of the various 
collectors who were specially employed to obtain material for the present work are 
recorded, viz. Messrs. F. B. Armstrong, E. Arcé, G. C. Champion (1879-1883), 
W. Lloyd, W. B. Richardson (1897-1898), H. Rogers (1877), and M. Trujillo (1888), 
and Mr. and Mrs. H. H. Smith (1888). From many others, also, we acquired or 
received vast numbers of specimens, all of which were duly acknowledged by our 
Contributors. 
As regards the Mammalia, Aves, Reptilia and Batrachia, Pisces, Mol) usca, 
Lepidoptera Rhopalocera, and Neuroptera (Odonata), the sources from whence our 
collections were derived are mentioned in detail in the ‘ Introductions’ to the volumes 
on these subjects and need not be repeated. The Coleoptera, or beetles, however, 
numbering 18,029 species in all, and requiring eighteen volumes for their enume- 
ration, by twelve contributors, demand special notice. Notwithstanding their vast 
number, and the great abundance of individuals, this is the only group of insects, 
the Lepidoptera excepted, for which sufficient contributors have been forthcoming to 
enable us to complete their investigation. The Coleoptera, therefore, occupy in this 
work an undue amount of space amongst the thirty-eight completed volumes of 
Insecta, as compared with the Hymenoptera, Neuroptera, &c., certain important 
families of which still remain unworked, this being due to the fact that the beetles 
have proved more attractive both to the collector and describer. 
The Coleoptera examined have been mainly supplied by the following col- 
lectors from each of the various countries :—Mexico—A. Sallé, C. T. Hége (who 
collected in nearly all the different States, Tamaulipas and Yucatan excepted), H. H. 
Smith (who specially visited Guerrero, Morelos, Vera Cruz, Tabasco, &c., for us), 
G. F. Gaumer (Yucatan), A. Forrer (N.W. Mexico, including the Tres Marias Is.), 
J. Flohr, F. D. Godman (Central and Southern Mexico), M. Trujillo (S. Mexico), 
Becker (Durango), Buchan-Hepburn (Chihuahua and Durango), and H. F. Wickham ; 
British Honpuras—F. Blancaneaux ; GuaremaLa—A, Sallé, O. Salvin, J. Rodriguez, 
G. C. Champion, L. Conradt, and F. Sarg; Nicaragua—lT’. Belt, E. M. Janson, and 
W. B. Richardson ; Costa Rica—H. Rogers, P. Biolley, Van Patten, C. F. Underwood, 
