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PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES<br />
Series 4, Volume 63, No. 10, pp. 329–331, 1 fig. October 14, 2016<br />
A New Synonymy in the Genus Pison Jurine, 1808<br />
(Hymenoptera: Crabronidae)<br />
Wojciech J. Pulawski<br />
Department of Entomology, California Academy of Sciences, 55 Music Concourse Drive,<br />
Golden Gate Park, California 94118, USA; Email: wpulawski@calacademy.org<br />
Pison montanum Cameron, 1908 is newly synonymized with Pison atrum (Spinola,<br />
1808). The combined range of Pison atrum extends from the Mediterranean Basin<br />
into South Africa.<br />
My recent studies on the genus Pison have revealed a previously unnoticed synonymy that is<br />
discussed below.<br />
Pison atrum (Spinola)<br />
Alyson ater Spinola, 1808:253, sex not indicated. Lectotype: ♂, Italy: Liguria: Marassi near Genova (Torino),<br />
designated by de Beaumont, 1952:42. – As Pison ater (correctly: atrum): Shuckard, 1838:75 (new combination).<br />
Pison jurinei Spinola, 1808:256, sex not indicated (as Jurini, incorrect original capitalization and termination).<br />
Lectotype: ♂, Italy: Liguria: no specific locality (Torino), designated by de Beaumont, 1952:42. Synonymized<br />
with Pison atrum by Shuckard, 1838:75, synonymy confirmed by de Beaumont, 1952:42 (as<br />
new synonym).<br />
Tachybulus niger Latreille, 1809:75, ♀. Syntypes: ♀, France: Brive and Italy: Genova (destroyed). Synonymized<br />
with Pison atrum by Shuckard, 1838:75.<br />
Pison montanum Cameron, 1908:289, ♂ (as montanus, incorrect original termination). Holotype by monotypy:<br />
♂, Tanzania: Mount Kilimanjaro: Kibonoto (Naturhistoriska Riksmuseet Stockholm), examined.<br />
New synonym.<br />
The African species Pison montanum was included by Turner (1916), Arnold (1924), and<br />
Leclercq (1965) in their keys to Afrotropical Pison, but apparently none of them examined the<br />
holotype. Of these authors, only Leclercq noticed the species close similarity to P. atrum, although<br />
he did not synonymize the two names.<br />
Pison montanum, as traditionally interpreted, and also P. allonymum Schulz, another Afrotropical<br />
species, closely resemble P. atrum (the type species of the genus) in having the following combination<br />
of characters: presence of three submarginal cells, second recurrent vein joining second<br />
intersubmarginal cell or nearly so, punctures of upper frons coarse (Fig. 1), propodeum without<br />
longitudinal carina separating side from dorsum and posterior surface, male sternum VIII broadly,<br />
deeply emarginate apically. Also, in most specimens the basal declivity of tergum I is covered with<br />
erect setae, and the hindcoxal dorsum has the inner carina produced into a conspicuous tooth basally,<br />
although the tooth is reduced in size or totally absent in many males.<br />
Pison allonymum Schulz and P. montanum (as traditionally interpreted) differ by the position<br />
of the hindocelli: in P. allonymum, the ocellocular distance is larger than the hindocellar diameter;<br />
in P. montanum it is smaller than the midocellar diameter in the female and about equal to the midocellar<br />
diameter in the male. A hitherto unnoticed difference is the shape of the clypeal lamella of<br />
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