34 
Psyche 
[February 
rather pale brown, but very distinct, the veins terminating 
abruptly as indicated; weak apical section of radial vein very 
indistinct and visible only in certain lights. 
Type in the Amber collection of the Zoological Museum of 
the University of Konigsberg. 
Taken together the two genera exhibit a much closer affinity 
to Megalyra than is evident from a knowledge of either Dinapsis 
or Prodinapsis alone. In fact the neuration of Prodinapsis is 
almost identical to that of Megalyra except that the basal cells 
are separated by a very heavy vein in the latter and the apical 
part of the radius, although not vein-like, is indicated by a much 
more evident thickening. That the unknown female may be 
provided with a long ovipositor is also probable. The short and 
complete radial cell and absence of discoidal cells in Dinapsis 
give the wing a very different appearance, but the almost exactly 
similar, yet strikingly characteristic cephalic thoracic and ab- 
dominal structure, shows Dinapsis and Prodinapsis to be very 
closely related. On account of this similarity to Megalyra, it 
seems very doubtful whether the Dinapsidse can be retained as a 
family distinct from the Megalyridse since the differences are of 
a very minor nature. In both groups the head, antennae, 
medially grooved meson otum, scutellum with separated axillae, 
oval sessile abdomen with more or less equal segments, long 
thread-like ovipositor and wing venation agree closely in form 
and structure; only the size is different, for Megalyra is a large 
insect and the other two genera are very small. 
The actual relationship of the three genera is rather difficult 
to elucidate, since as already stated Megalyra and Prodinapsis 
have almost identical wings while Prodinapsis and Dinapsis are 
almost identical in bodily characters, but each with a wing type 
that cannot be derived one from the other, nor can both be 
derived from that of Megalyra. If the three are closely related, 
as seems undoubted, the ancestral form must have had a body 
like Dinapsis or Prodinapsis and wings with a marginal, cubital, 
two basal and two discoidal cells. Such an insect must have 
been more or less Oryssoid in many somatic and venational 
