572 Mr. CameroM@ notes on Hymenoptera, 
body is much brighter, the antennal fovea is deeper, but 
the frontal area is not so clearly indicated, the clypeus is 
more transverse at the apex, the base of the legs always 
paler than the rest, and the pleure are marked with 
yellow. Dorsivittatus may be known from it by the 
black metathorax and cox, by the band on the abdomen 
being broader at the base and more distinct throughout, 
the band in inornatus being not much more than a 
darkening in colour compared to the colour of the rest of 
the abdomen. 
Rare on birch in June. Bishopton, Rannoch. 
20. T'. nassatus, Lin., non Thoms. 
21. T’. sordidus, KI. 
The following table will aid in the identification of our 
species. I should add that I am not quite satisfied about 
some of the names I have adopted from the older authors, 
whose descriptions are not always clear, and the synonymy 
is very confusing, owing to different species having been 
described under the same name :— 
A. Body for the greater part black. 
I. Abdomen red at apex: 
Legs entirely red, . : . cordatus. 
Hind legs for the greater part black. femoratus. 
II. Abdomen entirely black. 
Legs red. . microcephalus. 
Legs for the greater part black. . . caliginosus. 
Ill. Abdomen red in the middle. 
a. Pronotum and coxe entirely black. 
1. Posterior femora black. F . nigricollis, 
2. Legs red. 
Antenne short; hinder knees black; the red on 
abdomen not spotted with black. ignobilis. 
Antenne longish ; the red on abdomen spotted 
with black ; knees black. . nigronotatus. 
. Pronotum, coxe, and femora lined with white; 
the red on abdomen marked with black in the 
centre. 
1. Posterior femora black. ‘ . scutellaris. 
2. Posterior femora red. 
cS 
