168 HYMENOPTERA. 



there exists a remarkable disparity ; specimens believed to be 

 male and female have been received from Albania, and also from 

 Portugal. Dahlbom has placed the species included in the genus 

 Ferreola in that of Salius, the true species of Salius being ap- 

 parently removed into a new genus, Homotus. 



The species of the extensive genus Pompilus present so many 

 phases of difference, that without types of every described species, 

 it becomes impossible in a catalogue to arrange them in any 

 more satisfactory order than that of locality ; in arranging those 

 belonging to the fauna of any particular country, the armature 

 of the legs appears to afford the most constant character, and is 

 one especially desirable, since it is a clue to habit. 



1. FERREOLA DIMIDIATA. B.M. 



Sphex dimidiata, Fabr. Ent. Syst. ii. 209. 45. 

 Pompilus dimidiatus, Fabr. Syst. Piez. p. 189. 10. 



Van d. Lind. Hym. d'Eur. 322. 17. 

 Ferreola Algira, St. Farg. Hym. iii. 468. 1. t. 36. f. 1 ? . 



Lucas, Explo. Sc. Alger. iii. 269. t. 14. f. 4. 



Hob. Algeria ; Barbary. 



2. FERREOLA HUMBOLDTI. 



Salius Humboldti, Dahlb. Hym. Europ. i. 441. 

 Hab. Egypt. 



3. FERREOLA SCHIODTEI. B.M. 

 Salius Schiodtei, Dahlb. Hym. Europ. i. 441. 



Hab. Egypt; Cape of Good Hope ; Port Natal. 



4. FERREOLA BICOLOR. B.M. 



Female. Length 7 lines. Head, prothorax, mesothorax, scu- 

 tellum and tegula3 ferruginous ; the face fuscous ; the meta- 

 thorax truncate, deeply excavated, and receiving the base of the 

 abdomen ; the legs, metathorax and abdomen cyaneous -, wings 

 deep fuscous, the third submarginal cell much narrowed towards 

 the marginal. 



Hab. Port Natal 



This species closely resembles F. Schiodtei, but the prothorax 

 is longer and the metathorax much more deeply excavated. 



