TEOPICAL AMERICAN DIPTERA OR TWO-WINGED FLIES OF THE FAMILY DOLICHOPODIDAE FROM CENTRAL AND SOUTH AMERICA By M. C. Van Duzee Of Buffalo, N. Y. The following paper is a report on three collections of Dojichopodi-dae: one taken by J. M. Aldrich in Guatemala, during May and June, 1926; one by C. T. Greene in the Panama Canal Zone, during March and April, 1926; and the third by Nathan Banks in the Panama Canal Zone, during June, July, and August, 1924. There were a few specimens taken by others among the material studied. These collections contain 77 species, of which 61 are described as new; there are two new genera. From the large proportion of undescribed forms among them it would seem that there is much work to do before we have even a good general knowledge of the species inhabiting this interesting region. In using the measurements of tarsaj joints there must always be an allowance made for individual variation and also the personal equation, as no two persons seem to measure the joints with just the same result when the measurements are made from pinned speci-mens, but I think they will give the proportional length of the joints much more accurately than any other method, unless the feet are mounted on a slide. I wish to express my sincere thanks to Dr. J. M. Aldrich for the privilege of studying the material from the United States National Museum, and to Mr. Natlian Banks for sending me that from the Museum of Comparative Zoology. Genus PSILOPUS Meigen Psilopus Meigen, Systematische Bcschieibung, vol. 4, 1824, p. 35. — Loew, Smiths. Misc. Colls., No. 171, 1864, p. 229. — Aij)rich, Trana Amer. Ent. Soc, vol. 30, September, 1904, pp. 279-286. — Van Duzee, Ent. News, vol. 26, January, 1915, pp. 17-26. No. 2755.— Proceedings U. S. National Museum, Vol. 74. Art. 10. 2613—28— — 1 1
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