70 
Psyche 
[September 
tergite with a pair of large pale spots barely separated medially 
[these maculations may be artifacts] ; antennae dark brown except 
scape paler; preserved parts of legs stramineous except hind coxae 
mostly fuscous; wings hyaline, with brown veins and stigma; wing 
membrane covered with microtrichiae, but body without visible setae 
or pubescence. Body surface smooth, without noticeable sculpturing. 
Front angle of ocellar triangle exceeding a right angle; lateral ocelli 
removed from eye margin by slightly less than half their own 
diameters, removed from the rounded vertex crest by somewhat more 
than their own diameters. Front femur 3 X as long as its maximum 
width. 
Holotype . • — ■ <$, Taimyr, N. Siberia, 1970, amber specimen no. 
3130-16. 
FAMILY SPHECIDAE: SUBFAMILY PEMPHREDONINAE 
Pittoecus, new genus 
Known from a single female approximately 5 mm in length, fully 
alate but with a reduced wing venation resembling that of certain 
living Pemphredonini (Figs. 5-8). Head broad, with large eyes 
extending from base of mandibles to or close to top of head ; temples 
broad; antennae short, 12-segmented, somewhat coiled, arising from 
small elevations of the front; mandibles straight, tapered, without 
visible teeth on upper or lower margin [clypeus and other mouth- 
parts not clearly visible, top of head (including ocelli) missing]. 
Pronotum with rounded posterior lobes similar to those of living 
Pemphredoninae [thoracic dorsum largely missing] ; mesopleura 
somewhat convex, without visible grooves; legs fully preserved, with 
only a few small spines, front tarsus without a pecten, hind tibia 
with a group of very short spines basally and a few along the shaft ; 
tibia! spur formula 1-1-2; claws dentate. Wings imperfectly pre- 
served, fore wing apparently with two submarginal cells, as figured. 
Metasoma slender and tapered, sessile basally, with six distinct seg- 
ments and a well developed sting and sting-palps [dorsum of abdo- 
men missing]. 
Type-species . — Pittoecus pauper , new species. 
Remarks . — Although the only available specimen is incomplete, 
consisting of a hollow mold of the ventral half of the body (with 
complete legs and partially complete wings), the form is so similar 
to that of living pemphredonine wasps such as Passaloecus that it 
seems worthy of description. The form of the second submarginal 
cell and the unusual distance between the origin of the basal and 
