4 
T. D. A. COCKERELL. 
The wings are distinctly dusky. The antennae are so close together 
that the scapes, when directed npwards, are contiguous. Tibiae with 
the usual short spines. 
Prussian Amber. Respectfully dedicated to Dr. A. Tornquist. 
Larridae. 
P ison oligocaenum sp. nov. 
5 . Black or very dark brown, du.ll, not 
strongly sculptured; length 8 mm or a little less; 
head broad (breadth about 2 mm), cheeks rounded, 
prominent ; length of anterior 
wings about 4 mm, nervures 
dark; metathorax (seen in 
profile) rounded; antennae 
twelvejointed, length of third 
joint 246 p, of last joint 255; 
width of flagellum 170 p. Fig. 2. 
Stigma very slender, Pisonoligocaenum Ckll. 
. Second submarginal cell. 
little developed; marginal 
cell long, narrow, sharply pointed, ending on costa, its length 1139p ; three 
submarginal cells, the first much longer than the other two combined, 
its length 1020 p ; second submarginal petiolate above, a subequilateral 
triangle about 272 p across; third submarginal, measured obliquely, 493p 
long,but only 1 70 on marginal; first recurrent nervure meeting first trans- 
versocubital, second joining third submarginal cell 51 p from its base; 
basal nervure falling about 100 p short of transversomedial; trans- 
versomedial 238 p long, a little oblique, the lower end about 50 p 
more basal than the upper; upper section of basal nervure about 
153 p long, lower 595, not allowing for the slight curve. 
Femora rather stout; depth of hind femora 476 p; hind tibiae 
broad (340 p) at apex. Middle tibiae with spur 561 p long, perfectly 
straight, microscopically pectinulate. Middle tibiae at apex above with 
three short ferruginous teeth, about 50 p long; fourth joint of middle 
tarsi very short, only about 136 p long; longer spur of hind tibiae 
748 p long, the apical two-thirds pectinulate like the spur of middle 
tibia, but the basal part with a brush of long bristles on inner side. 
Prussian Amber, one specimen. Mr. S. A. Rohwer has now in 
press the description of a species of Pison from the Miocene of 
Colorado. 
Crabro tornquisti Ckll. 
a Spur of mesotibia. 
b Apex of left metatibia, 
showing spines. 
