Vol. 70, pp. 69-110 October 4, 1957 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A SYNOPSIS OF THE GENUS ES SWELL A (A PHI DAE) F. C. Hottes I deeply appreciate the loan of type material and named and unnamed slides from E. 0. Essig. I am indebted to M. A. Palmer for the loan of type material from the Colorado Collection, for making the drawings and for her valued opinions on all species, particularly on the species described as new, but for which I take sole responsibility. A. A. Granovsky made available the type of E. pini Wilson which is now in his collection. G. W. Simpson sent me the material studied by Edith Patch. G. F. Knowlton sent his named and unnamed species. The United States National Museum, through Louise M. Russell made available types, and named and unnamed material. To all of these I would express my thanks. The genus Essigclla was erected by Del Guercio in 1909 for Lachnus ealifornieus Essig, which had been described earlier that same year. Revista di Patalogia Vegetale, Pavia, Anno III, n. 20-21, 1909. C. F. Baker, Editor of Pomona Journal of Entomology, Vol. 1, No. Ill 1909 gives a free translation of the original description. The genus was again characterized in 1920 by A. C. Baker in his Generic Classification of the Hemipterous Family Aphididae, at which time only two specie-were known to belong to the genus. The genus Essig ella belongs to the Subtribe Eidachnina Baker, which belongs to the Tribe Lachnini Wilson. There are three genera in the Subtribe Eulachnina, all of which have the rostrum obtuse, the fifth segment much reduced. The cornicles are shallow, with the base not much wider than the rim, with few or no hairs, or with the cornicles reduced to ;i rim. All live on the needles or leaves of Coniferae. KEY TO GENERA OF EULACHNINA 1. First tarsal segment with dorsal hairs; cornicles free from hairs ... 2 First tarsal segment without dorsal hairs; cornicles with some hairs „ Sohisolaohnus Mordvilko 2. Antennae of five segments; apex of claws modified . . . Essigclla Del Guercio Antennae of six segments; apex of claws simple . . . Eulachnui Del Guercio n.
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