a 
84 Rev. F. D. Morice on 
in fact the two sexes can scarcely be distinguished without 
counting the abd. segments or examining the clypeus ! 
C. pruinosa f differs from the f of C. pallidula in the 
shape of the collar, which is much less profoundly im- 
pressed or emarginate in the middle; the 8rd antennal 
joint looks about as long as the 2nd and 4th taken 
together, while in pallidula it is scarcely longer than 
the 4th alone. Its average size seems to be a trifle 
greater, and its general tint is just a shade deeper—a 
pale lemon-yellow, while pallidula is rather creamy than 
actually yellow. The silvery pilose covering of the face 
in all my pruinosa f f is more conspicuous than in 
pallidula, but I have not sufficient material to determine 
whether this character is constant, though it appears to 
me that in pruinosa the actual hairs are longer than in 
the other species. 
Mr. Eaton’s specimens were taken on Ammi visnaga, 
and so probably were my own. He notes that the eyes 
of the ? in life were “light yellowish green.” 
1 9. Biskra, on Ammi visnaga, 23. v, 97. A. E. E. 
1g. Biskra, on Amm2 visnaga, 29. v, 97. <A. E. E. 
Ig. Biskra, 30, v.09. Hn. UNE: 
lf and: 2)0).9" Biskra, 72 -va293.. HsDr aM. 
1 © Biskra, 9;-vi, 98. FE. M. 
CERCERIS ANNEXA, Kohl 
A species resembling the two last in many respects, but 
smaller and far more delicately punctured. It seems to be 
common at Biskra every year in May, as Mr. Eaton took 
it in that month of 793, ’94,’95 and ’97, and I found it 
abundant in the same month of ’98. According to Mr. 
Eaton’s notes it appears to frequent first Zizyphus lotus 
and then Ammw visnaga. 
2242. Biskra, on Zizyphus lotus, 30. iv and 3. v, 95. 
A. E. E. 
12,19. Biskra, on Zizyphus lotus, 10. and 14. v, 97. 
A. E. E 
22%. Biskra, on Ammi visnaga, 17. v, 97. A. E. E. 
229. Biskra, on Ammi visnaga, 29. v, 94. <A. E. E. 
1 2. Col de Sfa, near Biskra, 27. v, 93. <A. E. E. 
132g. Biskra,( v to: 9: vi; 98: ) BM 
10 9:2, Biskra, 20.:v to 9. vi, 98) > EDM, 
