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 tibiae thickly set with short stout spines, 

 the calcaria white ; wings fusco-hyaline, irregularly clouded, the 

 nervures fuscous. Abdomen sessile, the apical margins of the 

 segments have narrow fasciae 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). 



I. Ctenocerus Klugii. ' B.M. 



Ctenocerus Klugii, Dahlb. Hym. Europ. i. 456. 23-24 S . 

 Clavelia pompiliformis, Lucas, Ann. Soc. Ent. Fr. new ser. 



(1852). 



Hab. Algeria. 



Genus 3. FERREOLA. 



Sphex, pt., Fabr. Ent. Syst. ii. 209 (1/93). 

 Pompilus, pt., Fabr. Syst. Piez. p. 188 (1804). 

 Salius, Dahlb. Hym. Europ. i. 441 (1843), 

 Ferreola, St. Farg. Hym. iii. 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 antennae 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 



