Descri'ptions of New Sphegidae. 531 
^. Smaller and paler than pictns, and more or less clothed with 
fine silvery hairs. Face and antennae pale testaceous, clothed with 
brilliant silvery pubescence ; vertex black, cheeks behind the eyes 
testaceous, clothed with rather long silvery hairs. Prothorax pale 
testaceous, clothed with silvery hairs, with a black band across the 
central depression of its notum ; mesonotum black, clothed with 
silvery hairs and punctured, its anterior angles pale ; scutellum, and 
a spot on each side of it, polished, shining, and very largely and 
remotely punctured; mesopleurae black above, beneath (as well as 
the sterna) shining and very remotely punctured. Wings hyaline, 
their nervures pale testaceous, metanotum black, postscutellum pale 
and shining ; propodeum finely rugulose, black, its “ area ” (the sides 
of which are testaceous) finely rugulose ; the sides beyond the area 
are clothed with brilliant silvery hairs. Legs pale testaceous with 
the front trochanters produced into a large angular tooth. Front 
metatarsi with four very fine, nearly white spines. Abdomen testa¬ 
ceous, very finely rugulose, first, second and third segment each with 
a broad pale sub-apical band, the actual apex submerabranous and 
colourless, clothed with silvery hairs. Beneath shining. 
9 . Very like the (J, but with the dark colour more extensive. 
The front trochanters are not dentate, but unusually elongate and 
slightly^ curved ; the front femora with a row of long white hairs on 
their underside ; the metatarsi with a comb of seven fine whitish spines, 
of these the two nearest the base are simple, the others more or less 
flattened ; three spring from the apex of the joint. Abdomen with 
the pale bands less in evidence than in the but the silvery apical 
bands are more pronounced. Pygidial area shining. 
Long. 5-5i- mm. 
A very distinct species recognisable at once by the 
silvery pubescence, and the peculiar structure of the front 
trochanters. 
[Types of ^ and $ are in Coll. Saunders, taken near Biskra 
by Mr. Eaton in April.] 
