Biological Sciences

A revision of the genus Zethus Fabricius in the Western by Richard Bohart and Lionel Stange

By Richard Bohart and Lionel Stange

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Additional info for A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae)

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Other characteristics are Zethoides-like also, and point to a relationship with the clypearis group. It could be argued that the pallidus type is ancestral to Zethoides with chapadensis as an intermediate form, but there are several arguments against this. For instance, chapadensis has only one midtibial spur and gives ample evidence of being a specialized Zethoides. Also, the pallidus group has derivative structures of its own, such as the narrowed subhumeral area, the scalelike pubescence of tergite II, the strong lateral propodeal carina, and the often unusual development of the lamella of tergite II.

Holotype male, Villa Morra, Paraguay (ANM). -Length to apex of tergite II from 16 to 20 mm. Black with slight bluish reflection, orange to reddish-orange mandible, clypeus, spot laterad of tentorial pit, postocular area, and often fore and hind legs. Sparse, short, pale pubescence usually on vertex and scutum, a little longer on mesopleuron. Vertex, pronotum, scutum, scutellum, mesopleuron, and petiole highly 34 University of Califor'nia Publications in Entomology polished with small, sparse punctures; female interantennal area longitudinally striate but without a strongly raised ridge.

229). -Agreeing with male except as follows: length 18 to 22 rom, clypeus completely black, mandible dark reddish. Pubescence on scutum short, inconspicuous; clypeus with a small medioapical dent. -Holotype male, 23 mi. S. Matias Romero, Oaxaca, Mexico, August 4, 1963, F. Parker, L. Stange collectors (UOD); one male paratype, San BIas, Nayarit, Mexico, July 2, 1956, R. and K. Dreisbach conectors (UeD); one female paratype, La Mesa de Nayar, Nayarit, Mexico, July 16-21, 1955, B. Malkin collector (CAS); t,vo female paratypes, San Rafael, Jilotepec ("Jicoltepee"), Mexico, W.

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