CONIFER SAWFLIES, DIPRIOMDAE: KEY TO NORTH AMERICAN GENERA, CHECKLIST OF WORLD SPECIES, AND NEW SPECIES FROM MEXICO (HYMENOPTERA) David R. Smith Systematic Entomology Laboratory, IIBIII, Agr. Res. Serv., USDA^ ABSTRACT — A key is given for tlie identification of the 6 genera of the family Diprionidae found in North America. The 11 world genera and 91 species and subspecies of the family Diprionidae are listed with the general distribution and host plant genera for each. Three new species from Mexico are described: Monoctenus sadadus, JMdiprion liowdeni, and Zadiprion roteus. Notes on the occurrence of the genus Neodiprion in Mexico and Central America are given. L Key to North American Genera of Diprionidae This key is provided to aid in the identification of adults of the Diprionidae encountered in North America. The use of the name Gilpinia as a genus rather than as a subgenus of Diprion is incorporated here. It is a name in wide usage throughout the world except for North America, and the genus is very distinct from Diprion, in fact, even more so than from Neodiprion. This key is partially adapted from Benson's (1939, 1945) key to the world genera. 1. Anal cell of forewing contracted in middle forming basal and apical anal cells, no anal crossvein ( fig. 1 ) ; male flagellar segments unipectinate [Monocteninae] 2 — Anal cell of forewing not contracted, anal crossvein present (fig. 2); male with at least 10 basal flagellar segments bipectinate [Diprioninae] — _ 3 2. Supraclypeal area not tiiberculate; clypeus emarginate; forewing witli veins M and Rs + M meeting before fusing witli Sc + R Augornonoctemis — Supraclypeal area tuberculate; clypeus subtruncate; forewing with vein M meeting Sc + R basad to point where Rs + M meets Sc + R -. Monoctenus 3. Cenchri small, nearly two times farther apart than breadth of one; metascutellum large, at least as long as breadth of a cenchrus (fig. 3) Diprion — Cenchri large, close together, distance between them less than the breadth of a cenchrus; metascutellum small, shorter than breadth of a cenchrus (fig. 4, 5) 4 4. Anal cell of hindwing with petiole much longer than cell width; ab-dominal terga densely sculptured; mesoscutellum blunt in front ( fig. 4 ) ... Gilpinia — Anal cell of hindwing with petiole scarcely longer than cell width; ab-dominal terga usually polished, sometimes with fine microsculpture; mesoscutellum acute in front (fig. 5) 5 5. Female pulvillar pad of hindbasitarsus shorter than apical breadth of ^ Mail address: c/o U.S. National Museum, Washington, D.C. 20560. 409
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