240 MR. R. SHELFORD ON MIMETIC INSECTS AND [Nov. 4, 
visible both in a dorsal and a profile view. A species of Oberea 
near rubetra (6), and probably a form of it, is really intermediate 
in character between these two sets of mimics, the elytra being 
brown anteriorly (basally) and black posteriorly. The remaining 
species of QOberea mentioned in the table mimie the reddish- 
ochraceous Braconids. 0. insoluta and the species of Vupserha 
have a pale golden pubescence on the basal abdominal segments, 
and QO. sp. (10) has a similarly situated greyish pubescence: in 
every case this coloration is not so effective as the white patches 
of O. brevicollis, &e. ; but these unicolorous Obereas are so much 
more active on the wing, so much more Hymenoptera-like in 
their actions when resting on a leaf or twig, that when they are 
alive one is much more apt to mistake them for their models than 
their bicolorous congeners. In other words, these unicolorous 
Obereas compensate for the imperfection (from a mimetic point 
of view) of their coloration by their close approximation to the 
actions of their models. O. consentanea (8 & 9), O. sp. near 
rubetra (6), and O. n. sp. (10) have the elytra clothed with a 
delicate silky-grey pubescence, especially in the posterior two- 
thirds, the appearance varying according to the position in which 
the insect is held; and these species mimie Braconids with the 
outer third of the wings pale fuscous, the varying reflections of 
the elytra giving a similar impression to that produced by the 
semitransparent fuscous parts of the model’s wings. 
Glenea tresine (Pasc.) is a small blue species; the middle third 
of the elytra is brown, shading anteriorly into blue, posteriorly 
into greyish white; the model is a small blue Hylotoma, and 
when the wings are laid back the resemblance between the two 
species is striking ; the blue anterior third of the beetle’s elytra 
corresponds to the posterior part of the //ylotoma’s thorax, the 
brown portion to the abdomen with the superposed wings, the 
greyish posterior third to the tips of the wings of the model, 
which project beyond the end of the abdomen. 
Turning to the family Cerambycide, we find that the sub- 
families Callichromine and Necydaline present in the reduction 
of the elytra a marked Hymenopterous appearance. Vothopeus 
Jasciatipennis (C. O. Waterh.) has already been figured and 
described (Trans. Ent, Soc. 1885, p. 369, pl. x.). Vothopeus sp. 
near hemipterus (Fab.) is a large black species with entirely 
fuscous wings, and is an admirable mimie of a formidable 
wasp, Mygnimia anthracinus (Sm.), which occurs commonly 
on Mt. Matang. The buzzing flight and other movements of 
these two Nothopei are remarkably wasp-like and so completely 
deceived the Museum collectors that they employed the greatest 
precautions in transferring the specimens from the net to the 
killing-bottle. 
A magnificent new species, described by Mr. Gahan in Appen- 
dix I]. as WNothopeus intermedius (Plate XIX. fig. 21), was 
captured near the summit of Mt. Penrissen together with several 
of its models, Salius aurosericeus (Guer.) (Pl: ite XIX. fig. 20). 
[12] 
