Hymenoptera aculeata collected in Algeria: the Sphegidae. 91 
CERCERIS TRISTIOR, 0. sp. 
This small dark species, of which I found ¢ 9 only, in 
general appearance and coloration much resembles guadri- 
maculata, and occurred at the same place and time with 
that species. But, besides being very much smaller, it is 
at once distinguishable by its almost unsculptured “ cordi- 
form” area, and the shining surface of its head and thorax 
above, the punctures on which are comparatively small 
and sparse. The almost entirely black face with merely 
a small pale spot adjoining each eye (as in many 
Prosopis 2 2) 1s a curious character, and appears in all my 
specimens. 
Q. Nigra, nitida ; macula in medio orbitae internae utriusque 
oculi, et segmentorum abdominalium 3" 5" que fasciis latis apica- 
libus (antice in medio emarginatis) ‘flavis. 
Antennae fulvescentes apicibus denigratis scapis flavis. Mandi- 
bulae breves (in medio marginis haud dentatae) fulvae apicibus 
nigris. Pedes cum tegulis alarum flavi vel plus minusve fulves- 
centes. Alae apicibus haud obscurioribus subfumatae, costa 
stigmate etc. brunneis. 
Clypeus totus niger, forma simplici, sed valde tumidus (convexus). 
Segmenta ventralia omnino simplicia. Caput superne sparse, 
mesonotum cum scutello etiam sparsius punctatum ; pleurae rugosae ; 
propodei area media disco laevigato, lateribus subtilissime (fere 
microscopice !) striolatis ; areae eiusdem laterales dense punctatae. 
Abdomen superne punctis mediocribus subnitidum, area pygidialis 
anguste subovalis, coriacea, plus minusve rufescens vel brunnescens. 
Oculorum margines interni fere paralleli: ocelli inter se minus 
quam ab oculis distaut. 
Long. circ. 9 mm. 
3 2 2. Constantine, 16. vi, 98. F. D. M. 
CERCERIS QUADRICINCTA, Pz. 
This is evidently an abundant species in Algeria, and 
must have, I should conjecture, more than one generation 
in the year. I have taken it as early as March (at 
Cherchell) and abundantly in April 1910 (in the Province 
of Oran), while Mr. Eaton’s records of it extend from the 
middle of May to the 19th of September in various years. 
(It is rather curious that in ’98 I do not seem to have 
met with it, but possibly I may have given away or mislaid 
my specimens.) 
