Species 0f Solidaigo in Relation to Cyllcne Robiaiae 19
I`, but it agrees nevertheless with spring males in having the
ts antennae and posterior femora longer than those of its female,
and in having the prosternal process narrower than long.
.n _, Comparing males collected from locust in spring with those
td ` from other`situatio’ns the males are found to agree in having
m . the antennae and posterior femera relatively long, in having
tg ’ narrow pros-ternal processes, and in having gray VV-marks and _
gg sutural spots in the majority of examples. So far as both
lg ° structure and coloration arc concerned, they are typical Cyllene
pictrz. The females collected on locust in spring differ in no `
Fd A structural feature from those collected in the fall, having short
VQ T antennae, short posterior femora, and broad prosternal processes; ,
  but show a tendency toward gray VV-marks and sutural spots. ‘
g- _ The denuded ventral side of the second segment of the pos-
er terior tarsus, relied upon by Dr. Horn for the separation of ~
ge _. C. robinioc from C. picfa, seems to be a result of age and wear,
vc T and docs not suthce for the separation of the two forms. The
tal g shape of the prosternal process is a sexual character serving ,
~h- for the recognition of the sexes of both forms, but not for the ‘
ks y separation of beetles collected in fall from those collected in
ch  ' spring. Placing examples of the two forms together, it would `
, be difficult to recognize the females except by the color of the
in _· WV-mark and sutural spots, and these, as has been noted, fail '
in Q  in some individuals. The males of the spring form, either from
VQ  _ A locust or hickory, can always be recognized by the antenna
ihc  A being longer than the body, It is shorter than the body in both
mi { males and females taken from locust in the fall. _
nd  T The beetles collected from black locust this spring were
ust 1 mating and placing their eggs on the bark, and continued to lay
ots  h when confined with sections of trees kept in a rearing cage.
i1_V·   Young grubs hatched from these eggs bored into the bark like
Q. those taken in the fall and it is hoped can be carried thru to
ml  , maturity.
nd N  Unfortunately the trees were not examined carefully until
in-  5 the beetles were observed about them, but. there can be little
ile,   question that they had emerged from empty burrows found in