Descriptions of Hymenoptera from Baltic Amber. 
3 
By the sculpture of the abdomen, and other characters, this 
species is closely related to H. leptocorisae Howard. 
Crabronidae. 
Crabro succinalis sp. nov. 
J. Black, 5 mm long; knees, tibiae and tarsi, scape and base of 
flagellum ferruginous; abdomen narrowed basally, but sessile; antennae 
12-jointed; mandibles not visible in type, but in another example shown 
to be bidentate, the inner tooth subapical, obtuse and very small; ocelli 
in a tri angle. 
Wings hyaline, nervures and stigma dark fusco-ferruginous; 
Stigma large, about 136 // deep; marginal cell 1105 // long, and about 
204 // broad at apex, receiving the transverso-cubital nervure 408 // 
(on marginal nervure) from base; submarginal cell 1173// long, receiving 
the recurrent nervure 561 // from base and 476 from apex, measuring 
along cubital nervure; first discoidal cell 884 // long; basal nervure 
falling about 68 // short of transversomedial; second discoidal cell 
about 700 // long. 
Prussian Amber. The collection contains eight specimens, agree- 
ing in the venation, and apparently all of one species. The insect 
is a perfectly ordinary and normal member of the Tracheliodes or 
Brachymerus group of Crabro , of which I have previously described 
a fossil species ( Crabro mortuellus, Bull, Mus. Comp. Zool., 1906) from 
the Miocene of Colorado. I have compared every visible part with 
modern species, and find nothing to indicate even subgeneric d iff er- 
eil ce. The hind tibiae, with their spines and spurs, are quite ordinary, 
as also is the shape of the head, with the antennae placed close to- 
gether, etc. Comparing the venation with Kohl’s figure of C. megerlei 
Dahlb., only the following slight differences appear: 
1. ) The lower apical corner of marginal cell is rounded, and the 
apex of marginal cell is at right angles to costa. 
2. ) The basal nervure is a little nearer to transversomedial. 
Crabro tornquisti sp. nov. 
In addition to the eight examples of C. succinalis , there is one 
specimen of a closely allied but much larger species, about 10 mm 
long. It has the same coloration as C. succinalis, but the venation is 
not quite the same; the basal nervure meets the transversomedial, and 
the recurrent nervure joins the submarginal cell well beyond the middle. 
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