Cambridge Entomological Club, 1874

A Journal of Entomology

founded in 1874 by the Cambridge Entomological Club
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This is the CEC archive of Psyche through 2000. Psyche is now published by Hindawi Publishing.

C. T. Brues.
A Species of Urocerus from Baltic Amber.
Psyche 33(6):168-169, 1926.

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16s Psyche [~ecember
A SPECIES OF UROCERUS FROM BALTIC AMBER. Bussey Inst.itjutrion, Harvard University. In a large collection of parasitic Hymenoptera of oligocene age imbedded in Baltic Amber recently received from the Geolo- gical Instit.ute of the University of Konigsberg there is a single fine specimen of wood-wasp referable to the genus Urocerus. As very few fossil Siricidse have been described and as the family is of particular interest on account of its early known occurrence in t,he upper Jurassic, iihis species is described below. Urocerus klebsi sp. noy. (Fig. 1.)
8. Length 16 mm. A rather well preserved specimen showing the entire fore wing, antennae, legs and underside of body. Antense consisting of 21 segments, reaching to the tip of the second sternite; flagellar joints of quite even length, Fig. 1. Urocerus klebsi sp. nov., anterior wing. gradually more slender to the apex of the antenna; second fla- gellar joint equal to the first, nearly four times as long as thick. Posterior tibise apparently not so distinctly flattened as in the male of Urocerus cressoni Norton, although they cannot be viewed exactly in the lateral aspect; with two short subequal apical spurs and with two series of small bristles below, one along each edge. Anterior wing (Fig. 1) typical for the genus; first transverse cubitus with its lower end bent sharply downward and entering the first discoidal cell at the basal fourth; second section of radius fully two-thirds as long as the third and twice as long


19261 A Species of Urocerus from Baltic Amber 169 as the first; submedian cell very littlle longer than the median; externomedian vein bent downward near apex, but entirely with- out any stump of a vein; second recurrent nervure entering the third cubital cell before its basal third; transverse lanceolate vein obscured at its base, but apparentJy arising just before the lower end of the transverse median vein. The apex of the ab- domen has been removed in polishing the amber and cannot be described.
Type in the collection of the Geologisches Institut of the Univzrsity of Konigsberg
This species differs from the European U. gigas and the North American U. albicornis, californicus and cressoni by the insertion of the first transverse cubitus on the upper side of the d'scoidal cell instead of on the basal vein. The one other North American species, U. taxodii Asliin. is not in my collection, but Bradley has published a good figure (Pomona Journ. Entom., vol. 5, p. 31) which shows the amber species to resemble taxodii in this respect. The second section of the radius is proportion- ately much longer than in any of the above-mentioned living species except U. cressoni where it is as long as the third. I have named this species in honor of Professor Klebs who first reported the occurrence of Siricidae in amber. Klebs (Tagbl. Naturf orschervers., vol. 62, p. 269) in 1889 referred Baltic amber specimens to Sirex, a closely similar genus. Quite probably the present species may be the same form.
Siex has been reported from the miocene beds of Radoboj. This was described by Heer as "Urocerites7' but later referred to Paururus by Konow (Wiener Entom. Zeit., vol. 17, p. 87, 1898). The name Paururus is now replaced by Sirex. To judge from Heer's figure the posterior tibise and their metatarsi are flattened much as in the peculiar Cuban genus Teredon and I cannot be satisfied that Konow's reference is correct although of course the males of other genera show a tendency in this direction and Heer's specimen is probably a male; unfortunately the ant'ennae of "Urocerites7' were not preserved, so that there is no indication whether they were of the peculiar type of those of Teredon. Heer has restored them in one figure, but entirely on tlhe basis of those of Sirex and Urocerus.


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