HYMENOPTERA. 167 
black. Abdomen yellow, the basal segment black, sometimes 
the base of the second black. 
Hab. New Holland (Houtman’s Abrolhos, W. Coast). 
236. PoMPILUS VIDUATUS. 
Female. Length 6-7 lines. — Black: the face with a fine 
short cinereous pubescence, the vertex impunctate, the cheeks 
with long cinereous pubescence. Thorax smooth, slightly 
shining ; the metathorax opake, truncate behind ; the sides of the 
thorax and the legs have a changeable hoary pile ; the interme- 
diate and posterior tibia thickly set with short stout spines, 
the calearia white ; wings fusco-hyaline, irregularly clouded, the 
nervures fuscous. Abdomen sessile, the apical margins of the 
segments have narrow fasciw of fine white pubescence. 
Hab. New Holland. 
Genus 2. CTENOCERUS. 
Ctenocerus, Dahlb. Hym. Europ. i. 456. 23-24 (1843). 
Clavelia, Lucas, Ann. Soc. Ent. Fr. new ser. (1852). 
l. Crenocerus Kuveut. B.M. 
Ctenocerus Klugu, Dahlb. Hym. Europ. i. 466. 23-24 3. 
Clavelia pompiliformis, Lucas, Ann. Soc. Ent. Fr. new ser. 
(1852). 
Hab. Algeria. 
Genus 3. FERREOLA. 
Sphex, pt., Fabr. Ent. Syst. ii. 209 (1793). 
Pompilus, pt., Fabr. Syst. Piez. p. 188 (1804). 
Salius, Dahlb. Hym. Europ. i. 441 (1843). 
Ferreola, St. Farg. Hym. ii. 468 (1845). 
This can only be regarded as a subgenus, established by St. 
Fargeau for the reception of the Pompilus dimidiatus of Fabri- 
cius; the species included in it have the antennz short, thick- 
ened, and gradually tapering to a point ; the head narrower than 
the thorax, the prothorax longer than in Pompilus, in the males 
nearly as long as the meso- and meta-thorax combined ; the ab- 
domen sessile and as wide as the thorax. 
The genus Salius of Fabricius appears to be founded on the 
male of an ordinary Pompilus, but between it and its female 
