174 CRABRONID&. 
scutellum, and sometimes the whole thorax black, and the legs 
less varied with yellow. 
é 9 in my own and other Collections. 
+4+ I have occasionally taken this species in Battersea 
Fields ; its habits seem similar to those of the C. albilabris. 
I have found them both frequenting pathways, in which 
they nidificated in company with Cerceris ornata; but I 
have more frequently taken the present upon a red-currant 
bush infested by an Aphis. 
Sp. 32. exicuus. V. d. Lind. 
niger, metathoracis basi levi, peristethio denticulato, abdomine 
ovato-conico. 
length 14.—23 lines. 
V. d. Lind. pt. 2. 72. 33. 
Crossocerus exiguus. St. Farg. 3. 791. 30. 
Head black, smooth and shining, with scattered very minute 
punctures ; the stemmata placed in an equilateral triangle in 
the centre of the vertex, an oblique perfectly smooth depression 
on each side of the posterior ones, a longitudinal deep impres- 
sion between them, extending a little beyond, and another in 
front of the anterior one, reaching to the face, which is canali- 
culated, smooth, and shining; the antenne black, with the scape 
yellow in front; the inner orbits of the eyes and the clypeus 
(which is carinated in the centre) covered with a dense silvery 
pubescence ; the mandibles black, with their apex piceous. 
The thorax black, shining, with scattered punctures, covered 
beneath with a loose silvery pubescence; at the base of the dor- 
solum two central parallel longitudinal impressions, which ex- 
tend to the disk, and an abbreviated distinct carina on each 
side of them; the metathorax with an enclosed subcordiform 
space at its base, smooth and shining, or merely very slightly 
obliquely striated at its extreme lateral edge, and having a 
