Hymenoptera aculeata collected in Algeria: the Sphegidae. 81 
superne. punctis dispersis vel subdispersis nitidissima. Propodei area 
media, basi non aut vix striolata, sed in medio longitudinaliter im- 
pressa vel sulcata, disco eiusdem (etiamque partibus adjacentibus 
arearum lateralium satis late!) omnino impunctatis et laevibus. 
Ventris puncta crassa et valde inaequalia, partim confluentia, partim 
sparsa, partim fere obsoleta. 
6 (exceptis excipiendis) feminae simillimus. Paullo minus copiose 
rufescens, propodel area media tota nigra. Flavedo ut in 9, sed 
6" quoque segmenti dorsum fere totum flavet. Forma gracilior— 
petiolus praesertim multo magis elongatus. Coxae anticae (ut in 
Q) valde cuneiformes, flavae. Structura ventris cum ? congruens, 
32%. Biskra, on Polygonum aviculare, 30. vi, and on 
Ammi visnaga, 8. vu, 97. A. HE. E. 
1 2. Biskra, on Ammi visnaga, 24. v, 97. A. E. E. 
be Biskrasl6sve-9s. 8. Dy Me. 
CERCERIS EMARGINATA, Pz. 
This species is so common in all Mediterranean countries 
that a complete list of localities, etc.,seems hardly needed. 
Mr. Eaton took ¢ # as early as March (at Biskra in 97), 
and as late as October (Azazgain’93). They occurred visit- 
ing many different plants, as Antirrhinum ramosissimum 
at Biskra, Marrubium vulgare at Constantine, Eryngium 
triquetrum at Médéa, Ammz visnaga at Biskra and Hippone. 
My own captures of it were all made at Biskra and most 
probably on Ammz visnaga. 
15 ff and 5 $F at various dates and places. 
A. E. E. and F. D. M. 
CERCERIS STRAMINEA, Duf. (?) 
A single ¢ taken by Mr. Eaton may possibly (?) belong 
to this species. It agrees with it at least (and with no 
other whose description is known to me) in being absolutely 
without black on the body except at the apices of the 
mandibles! There is, however, a slightly infuscated line 
behind each antenna running along the sides of the 
usual interantennal carina. 
In structure the insect 1s practically a gigantic emarginata 
(quite 10 mm. long). Dufour’s type was a 9, and he gives 
no characters but of colour; so that the identification I 
have suggested is a mere conjecture, and very likely wrong! 
Mr. Eaton’s specimen is entirely pale yellow (with the 
TRANS. ENT. SOC. LOND. 1911.—PARTI. (MAY) a 
