180 FOREST ENTOMOLOGY. 



Last ventral segment of male excavated at tip, not 

 obtusely triangularly produced ; sheath of female 

 very broad, or the posterior tibi* and tarsi 

 thickened. 



Posterior til)ipe and tarsi very broad and 

 flattened . . Crcesus, Leach. 



Posterior tibiae and tarsi not flattened. 



Posterior tibiae and tarsi thickened, tibiae 

 externally with longitudinal furrow 



HOLCOCNEME, Knw. 

 Posterior tibiae and tarsi simple ; sheath 

 very thick and stout . Nematus, Jur. 

 Clypeus truncate. 



Pentagonal area more or less distinct ; eighth 

 dorsal segment carinated, sub - produced ; 

 sheath simple ; elongate species 



LvGiEONEMATUS, Kuw. 



Genus Cladius. 



This genus, which is now known to systematists as Trichiocampus, 

 is a part only of the old genus Cladius. The name Cladius is still 

 kept for C. pecfhii'cornus, &c. It has the third joint of the antennje 

 curved, and the species on Lombardy poplar has an orange-red 

 abdomen. 



Cladius (Trichiocampus) viminalis (Fall.) 



This insect may be found in the larval stage on- the leaves of 

 Lombardy poplar. The larvte feed in company on the under side of 

 the leaves, generally from three to five in a row, each larva touching 

 its neighbour, and all keeping in perfect line. The larvae are a 

 beautiful light-orange colour, Avith dark head, and clothed with strong 

 hairs. There are also rows of black flecks across the rings. Length 

 from 15 to 22 mm. 



The female insect has black head, thorax, and antennae ; abdomen 

 light-yellow ; legs in all parts light-yellow. Wings with light-brown 

 veins and stigma. The male is similarly coloured, but the antennae 

 are dark-brown. Length of female 9 mm. ; spread of wing about 

 18 mm. Male 6 mm. ; spread of wing 13 mm. 



