[3.0049] A KEY TO THE DRYOPID GENERA OF THE NEW WORLD (Coleoptera, Dryopoidea) 1 HARLEY P. BROWN 2 INTRODUCTION Seven genera representing the family Dryopidae have thus far been report-ed from the Western Hemisphere. Of these, only three are common and widely-distributed within the hemisphere: Dryops, Helichus, and Pelonomus. These three occur within the United States, and are included in the keys of Arnett (1963), Leech and Chandler (1963), and Leech and Sanderson (1959). All of these keys are satisfactory for the species within the United States, but none of them will serve for some of the Neotropical species, as is evident from the re-marks by Hinton (1937a) concerning the characters used by Musgrave (1935) to separate Dryops from Helichus. Furthermore, no one has published a key in-cluding the other four genera. One is needed, hence this attempt. Blackwelder (1944) lists the species recorded to that date, with an indica-tion as to the country from which each was described. His extensive biblio-graphy (1957) provides citations of the original descriptions of all such species, so I shall not duplicate the references or species list here. The genus Lutrochus listed by Blackwelder is now placed in the family Limnichidae (cf. Hinton, 1939), and the species he listed under the genus Parygrus should be transferred to the genus Helichus (Hinton, 1936a). I have had no opportunity to examine specimens of Protoparnus, Sostea, or Sost eamorphus , so the characters relating to these genera in the key below are extracted solely from the literature. The only feature I note in Pascoe's (1860) description of the genus Sostea or elsewhere that really distinguishes it from the genus Helichus is the large, laminate basal segment of the antenna (Fig. 1), which he further describes thus: ". . . when in repose it appears to act as a Accepted for publication June 3, 1970. 2 Department of Zoology and Stovall Museum of Science and History, University of Oklahoma, 730 Van Vleet Oval, Norman, Oklahoma 73069. Ent. News, 81: 171-175, 1970 171
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