58 HETEROMERA, [ Bdemeride. 
slender and filiform ; thorax narrower at base than elytra, not margined ; 
anterior coxal cavities broadly open behind, confluent; elytra elongate, 
covering abdomen, with more or less distinct raised lines ; abdomen with 
five free ventral segments, the sixth sometimes visible in the male ; legs 
iong or moderately long, penultimate joint of tarsi bilobed ; posterior 
femora very strongly thickened in the males in some genera. 
Thirteen genera, represented by nearly eighty species, are found in 
Europe ; of these four genera and only six species occur in Britain. 
I. Maxillary palpi with the last joint oblong, as broad or as a 
little broader than the preceding, not or slightly securi- 
form ; head produced in front. 
i. Eyes round, entire; posterior femora of male very 
strongly thickened in some species, in others simple . C(pDEMERA, Ol. 
ii. Eyes kidney-shaped. 
1. Antenne 11l-jointed in both sexes, with the third 
joint five or six times as long as the second ; posterior 
femora of male considerably thickened ; all the tibie 
with two apical spines . a) "ae Rigaenth we: ieist Yo) ky 
2. Antenne 12-jointed in the male and 11-jointed in 
the female, with the third joint about three times as 
long as the second; posterior femora of male not 
thickened ; anterior tibia with one apical spine . . NacerDEs, Schmidt. 
II. Maxillary palpi with the last joint plainly securiform, 
broader than the preceding; eyes oval, slightly emar- 
ginate in front; posterior femora of male not thickened; 
head not, or scarcely, produced in front . . . . . « IscunomeERA, Steph. 
(Asclera, Schmidt.) 
OncoMERA, Steph. 
GDEMERA, Olivier. (Necydalis, Fabricius.) 
Between thirty and forty species are known as belonging to this 
genus ; no less than twenty-eight are found in Europe, and the remainder 
occur in Siberia, Kamtschatka, Japan, Persia, and Algeria ; a consider- 
able number have the posterior thighs strongly dilated in the male; the 
head is considerably prolonged in front, and the antenne are inserted at 
a considerable distance behind the clypeus near the eyes; their first 
joint is shorter than the third, and the second joint is very short ; the 
eyes are round; the maxillary palpi have the last joint oblong and 
obliquely truncate at apex ; the thorax is deeply foveate on disc ; the 
elytra are more or less divaricate at apex ; the legs are rather long, 
and the tibie are furnished with very short spurs. 
The larva and pupa of O. virescens, which is considered by some authors as syno- 
nymous with O. lurida, are described and figured by Schiodte (xi. pp. 546, 547, t. xvi. 
14.and 17); the larva is about nine times as long as broad, with the head and thoracic 
segments more or less corneous, and is of a light colour; the head is large, a little 
broader than the prothoracie segment, which is larger than the meso- and meta- 
thoracic segments; the segments are incised at the joints, and are setose at the sides ; 
the apical segment is transverse, rounded, and simple; the legs are comparatively 
long; this larva is found under the bark of trees; the pupa is long with the ce- 
phalic region subquadrate, and with a prominence at each side of the apex of the 
thoracic region ; it is terminated by two small curved cerci. 
_ 
ee 
