Hymenoptera aculeata collected in Algeria: the Sphegidae. 85 
CERCERIS LUTEA, Tasch. (= nilotica, Schlett. !) 
I have carefully compared my single (2?) specimen, both 
as to colour and structural details, with one from Egypt, 
and can find no difference whatever. 
1 fg. Biskra, 7. v, 98. F. D. M. 
CERCERIS EATONI, n. sp. 
Caput nigrum, facie cum carina interantennali, mandibulis 
(praeter apices nigros) fascia pone ocellos, macula (vel striga) pone 
utrumque oculum flavescentibus. Thorax niger; collari, tegulis, 
scutello, postscutello que flavescentibus; pleuris sternis et pro- 
podei areis lateralibus plus minusve (in 2 opulentius) flavo-pictis. 
Pedes flavescentes, femoribus posticis (praeter genua) nigris. Ab- 
dominis segmenti 2" fascia lata antice emarginata, 4" (interdum 
etiam 5") basis nigra ; reliqua pars abdominis flava vel flavescens, 
segmentorum ventralium discis plerumque concoloribus. (Hisce in 
exemplaribus omnibus flavedo nonnusquam in aurantiacum vel 
ferrugineum transit, forsitan post mortem insecti decolorata). Alarum 
apices subfusi. 
Oculi divergentes sed leniter. Clypeus antice impressus, apice 
haud libero, Collare (propter impressionem transversam) postice 
marginatum videtur, angulis inferis prominulis non autem spinosis. 
Coxae anticae valde dilatatae acute cuneiformes. 2 mesopleurae 
(desuper visae) latera in medio denticulo acuto armata. Propodei 
area media polita ac nitida, in medio sulco longitudinali divisa. 
Petiolus elongatus, marginibus lateralibus aequaliter convexis. 
Segmentum ventrale 2" patella, ut mihi videtur, basali instructum, 
sed valde minuta, semicirculari. ¢@ corpus crasse punctatum, 9 
minus crasse sed tamen fortiter, inter puncta (¢ et 9) evidenter 
nitidum. 
Long. 6-9 mm. 
This is evidently a very near ally of albicincta, KL. but 
judging from Schletterer’s diagnosis of that species, I 
scarcely think the two forms can be specifically identical. 
Schletterer expressly says that albicincta has no basal 
elevation of the 3rd (2. e. according to my reckoning the 
2nd) ventral segment, but such an elevation seems to me 
certainly present in eatont. Nor does he allude to the 
cuneiform production of the front coxae and the spine-like 
tooth on the 2 mesopleura—characters which he would 
scarcely have overlooked had they existed in his albipwncta 
9. (The latter was first described by Schletterer, Klug’s 
type being a f.) 
