122 &.... F. D. Morice on 
the propodeum invariably unite into an entire arcuate 
(or semicircular) band—this is the case also with one at 
least of the ¢ ¢—and the apex of the abdomen is invariably 
a little rufescent. 
Having carefully considered all Handlirsch’s descriptions 
of the species assigned by him to the fasciatws-group 
(rufiventris, niloticus, etce.), and examined in the light of 
them the structural characters (puncturation, J antennae, ) 
as well as the colour of the wings and body in these 
insects, I can find nothing to which they seem likely to 
belong except tricolor. Characters of the latter which are 
conspicuous in them are the rather strong yellow staining 
of the wings, the dark violaceous-brown cloud over their 
radial area, and the clear exterior and inferior margin ; 
also the even thoracic puncturation, the narrow posterior 
and broad anterior, yellow edging round the eyes, and to 
judge from Handlirsch’s figure (Plate II, 10) the form of 
the apical joints in the ¢ antenna. 
I believe that the following specimens, which are all 
¢ ¢, may safely be referred to the same species. Certainly 
they now look very different from it; but only, I believe, 
because their original coloration has been completely 
altered by the effects of cyanide. In all of them, the red 
and yellow markings of normal ¢ricolor alike on thorax 
and abdomen are represented only by slightly-differing 
shades of sordid brownish orange. The pattern, however, 
of these markings seems to be the same as in ¢ricolor ; 
and, curiously, the yellow on the face (clypeus, etc.) is 
very little affected, though even here, occasionally, it 
inclines slightly to become rufescent. 
3 $2. Biskra, on Ammi visnaga, “ eyes reddish purple- 
brown, 18. and 25. v, 93.. A. E. E. 
2 2 f. Biskra, on Zizyphus lotus and Nitraria tridentata, 
‘“‘ Hyes purplish brown,” 24. v, 94. A. E. E. 
(One of these is very small and dark, with the basal 
abd. segment practically black, and the band on the 
second segment interrupted. But I think it is only an 
aberration.) 
2 ¢. Biskra, on Zizyphus lotus, “Eyes brown,” “ Kyes 
brown agate,’ 29. and 30. iv, 95. A. E. E. 
1 ¢. Biskra, on Ammi visnaga, 24. v, 97. A. KE. E. 
2 $f. Biskra, on Ammi visnaga, ‘ Eyes light red-purple,” 
25.¥, and 22.:v1, 07. A. Hel 
5 fg. Biskra, 14. to 24. v, 98. Fi.D. M. 
