August, 1885.] 4.9 



The luteous forms of lutea are readily separated from tlie normal 

 forms of syl\)arum^ which have always the head, thorax, and the 

 greater part of the legs bluish-black ; but the lighter coloured forms 

 of the latter come very near the darker coloured examples of lutea ; 

 these, however, may always be separated from sylvarum by the pu- 

 bescence, which, in the former, is thick, moderately long, and always 

 griseous, pale or yellowish, never fuscous as in sylvarum, which has it 

 somewhat longer, but not so close ; the hairs on the abdomen are also 

 longer, more scattered, and not so silky as in lutea ; the wings in lutea 

 are more yellowish, and there is no fuscous cloud in the median cellule, 

 nor has the apex a fuscous border. 



The reddish-banded males of sylvarum are easily separated from 

 those of lutea, which have always the abdomen black, except in one 

 aberration ; that aoaiu has sufficient distinctive characters in the colour 

 of the head, thorax, and wings ; but the only characters that I can find 

 to separate the black males of sylvarum from lutea are that the median 

 cellule of the former has a fuscous cloud, and the apex is always fus- 

 cous ; and that the club of the antennae is shorter and thicker, being 

 not much longer than the two preceding joints together ; in lutea they 

 are not so distinctly pyriform, and are considerably longer than the 

 two preceding joints together. The wings in lutea ^ have a well- 

 marked steel-blue iridescence, but I cannot say if this is a constant 

 character. 



Eare. 



4. CiMBEX HUMERALIS, Fourc. 



A species easily known by the characters given in the table. 

 TKICHIOSOMA, Leacli. 



Blotch absent ; labrum large, clypeus distinctly incised ; hind 

 femora large, long, toothed beneath ; hind coxae widely separated ; 

 body covered with long hair. 

 1(2) Tibi* fuscous hetuleti,K\. 



2 (1) Tibiae testaceous or yellowish. 



3 (4) Femora clothed with black hairs, distiuctly violaceous ; abdomen clotlied at 



base with yellowish hairs, with short fuscous hairs in middle, and with long 

 greyish or yellowish hairs at apex Scalesii Leach. 



^ J J ^ (pl 5, fig. 2, vol. u, <J ). 



4 (3) Femora clothed with pale hairs. 



5 (6) Abdomen dull black, covered uniformly with long grey hairs ; the apex and 



sides of abdomen sometimes reddish ; the tibiae not darker than tarsi .. 



lucorum, L. 



6 (5) Abdomen bronzy-black, the hairs on base longer than on middle or apex ; the 



apex, sides, and belly usually ferruginous, sometimes black ; tarsi paler 

 than tibi« vHellinct, L. 



E 



