254 
Psyche 
[September 
represent a member of the Pemphredoninae, tribe Psenini, perhaps 
close to Psenulus. It is approximately the same size as living mem- 
bers of this genus and the venation is very similar indeed. As 
compared to Archisphex , Psenulus fuscipennis has a somewhat 
shorter and wider stigma, a slightly different slope to the basal and 
transverse median veins (but the two meet media in the same 
manner), a first recurrent vein which attains the inner corner of 
the second submarginal cell, and major veins (M and Cula) which 
reach the wing margin only as thin streaks. It is tempting to regard 
Archisphex as a pemphredonine, as the species to be described below, 
from the Upper Cretaceous, quite definitely belongs in that sub- 
family. However, generalized members of several other subfamilies 
have a venation sufficiently similar to this so that it is impossible 
to say that if Archisphex is a sphecid it is surely a pemphredonine. 
A basically similar venation occurs, for example, in the nysonnine 
genus Clitemnestra and in the sphecine genus Hemichalybion (al- 
though the latter is a much larger wasp). Little more can be said 
about the possible position of Archisphex ; we can only hope that 
other fossils will be discovered which will eventually tie it in with 
greater assurance to some group of wasps. 
Archisphex crowsoni, new species 
Length of fore wing 5 mm; features as shown in Fig. i. I would 
Fig. 2. Lisponema singularis n. sp., wings of type specimen. In the 
specimen, the fore wings are somewhat curled, the hind wings beneath the 
fore wings; they are shown here as if drawn apart and flattened. 
