58 HBTBROMERA. [(Edemeridce. 



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 

 h've free ventral segments, the sixth sometimes visible in the male ; legs 

 long 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 . (EDEMERA, Ol. 

 ii. Eyes kidney-shaped. 



1. Antennae 11-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 tibia? 



with two apical spines ONCOMERA, Steph. 



2. Antennae 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 tibiae with one apical spine . . NACERDES, Schmidt. 



II. Maxillary palpi with the last joint plainly securiform, 

 broader than the preceding ; eyes oval, slightly emar- 

 giuate in front; posterior femora of male not thickened; 



head not, or scarcely, produced in front ISCHSOMERA, Steph. 



(Asclera, Schmidt.) 



CEDEIVXERA, 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 antennae 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 tibiae 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 aud 17); the larva is about nine times as long as broad, with the head and thoracic 

 segments more or less corneous, aud is of a light colour ; the lit ad is large, a little 

 broader than the prothoracic segment, which is larger than the meso- and metn- 

 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. 



