168 
Psyche 
[December 
A SPECIES OF UROCERUS FROM BALTIC AMBER. 
By Charles T. Brues. 
In a large collection of parasitic Hymenoptera of oligocene 
age imbedded in Baltic Amber recently received from the Geolo- 
gical Institute 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 
the upper Jurassic, this species is described below. 
cT. Length 16 mm. A rather well preserved specimen 
showing the entire fore wing, antennae, legs and underside of 
body. Antenae consisting of 21 segments, reaching to the tip 
of the second sternite; flagellar joints of quite even length, 
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 tibiae 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 
Bussey Institution, Harvard University. 
Urocerus klebsi sp. nov. (Fig. 1.) 
Fig. 1. Urocerus klebsi sp. nov., anterior wing. 
