Hymenoptera aculeata collected in Algeria: the Sphegidae. 75 
SPHEX (PARASPHEX) ALBISECTUS. 
1 2. Bone, on Euphorbia paralias, 23. viii, 97. A. E. E. 
1 9. Biskra, on Mentha rotundifolia, 10. viii, 97. A. EK. E. 
1 9. Biskra, 22. iv, 97. A. HE. E. 
1 @ Biskra, on Atractylis serratuloides, 11. v, 97. 
A. E. E. 
Mr. Saunders has noted that the above ? 2? “show the 
pale apices of the segments very slightly,” but that he has 
“little doubt in referring them to this species, as they 
have only three teeth on the claws, and the ventral apex of 
the abdomen red.” 
SPpHEX (CALOSPHEX) NIVEATUS, Duf. 
1 gf. Biskra, on Ammi visnaga, 24. v, 97. A. E. E. 
1 2. Biskra,; 3, v, 97... ALE. E. 
The 2 is pinned together with a grasshopper (Sphin- 
gonotus 8-fasciatus) many times larger than itself, and Mr. 
Eaton has noted as follows:—“The grasshopper was 
struck by the wasp during flight, fell paralysed to the 
ground, and was being carried off when the wasp was 
caught.” 
SPHEX (CALOSPHEX) SENILIS, n. sp. 
This insect is exceedingly like the last, but its silvery (or 
rather hoary) clothing appears decidedly thinner, and as 
all the specimens agree in this, and they were taken at 
different times and under different circumstances, I hardly 
think this is merely due to “ rubbing.” 
The @ seems to me clearly distinct by the following 
characters :— 
(1.) Pecten tarsale, antici pedis, et tarsorum omnium armatura 
spinosa ion alba sed evidenter nigricantia. 
(2.) Clypeus haud planus, sed in medio longitudinaliter ita 
elevatus ut tectiformis vel puene carinatus videatur. Apex eiusdem 
angulariter (haud arcuatim) subexcisus, 
(3.) Scutellum in medio multo minus profunde impressum. (Hoe 
in niveato ita suleatum est, ut bituberculatum dici possit ; quod in 
senili videre nequeo.) 
The measurements of petiole, tarsal joints, etc., seem to 
me a little different from those of niveatus, but the differ- 
ences are so slight that I should hesitate to lay stress on 
this. As for the ¢ $I can find no really satisfactory 
