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VOL. XXI. DECEMBER, 1914. s No. 6 
SOME MYRMECOPHILOUS INSECTS FROM MEXICO.! 
By W. M. Mann. 
The following notes are based on a small collection made during 
the months of May, June and July, 1913, in the State of Hildalgo, 
Mexico. Most of this time was spent at the Guerrero Mill, 
located below Real del Monte, and at the Hacienda de Velasco, 
where I was the guest of Mr. and Mrs. C. W. Van Law. They, 
together with the other Americans and English in charge of the 
mines and mills, showed me every hospitality and it is largely due 
to them that I was able to reside and collect in this interesting 
locality. I am much indebted to Miss Helen L. Locke, Mr. and 
Mrs. J. H. Skews and Messrs. Broiderick, Benton, Funston and 
Calland, not only for assistance of various kinds, but for many 
desirable specimens which they collected. The material collected 
has been placed in the collections of the Museum of Comparative 
Zodlogy at Cambridge and of Mr. B. Preston Clark of Boston, 
through the kindness of whom the excursion was possible. 
Although this region is easily accessible, and unusually interest- 
ing and rich in insect life because of its ecologically varied nature, 
it has been largely neglected by collectors. Only a few things have 
been collected at Pachuca and at Guerrero Mill. Prof. W. M. 
Wheeler, in looking over the literature on Mexican ants, failed to 
find Hidalgo cited as the locality for a single species, and I have 
found no records of other insects from that state. 
Among the thirty-nine species and varieties of ants collected 
(an account of these has been published by Wheeler in the Journal 
of the New York Entomological Society, Vol. XXII, 1914, pp. 37-61) 
nine were found to harbor guests or parasites. Three of these 
belong to the genus Formica, one each to Camponotus, Prenolepis, 
1 Contribution from the Entomological Laboratory of the Bussey Institution of Harvard 
University, No. 84. 
