142 CRABRO 4-MACULATUS. 



tooth on their exterior towards the base ; the intermediate 

 femora testaceous behind and in front ; otherwise as in the 

 female ; the abdomen oblong, with seldom more than a minute 

 spot on each side of the first segment, a band more or less in- 

 terrupted at the base of the second and third, and a transverse 

 line on each side of the fourth, a central ovate spot on the fifth, 

 and a central transverse line on the sixth ; but the markings 

 on the first, fourth and fifth segments are sometimes wanting. 



This species is not very abundant in the London district. It is 

 widely distributed, but is much more rare than the next species. 



21. Crabro 4-maculatus. 



C. niger, flavo-maculatus ; margine infero capitis utrinque spina 

 armato ; metathorace basi lsevi. 



Crabro 4-maculatus, Fair. Ent.Syst. ii. 294. 4 $ ; Syst.Piez. 308. 4. 



Spin. Ins. Lig. fasc. iii. 177. 9. 



Dahlb. Hym. Europ. i. 351. 30. 



Wesm. Hym. Foss. Belg. 139. 19. 

 Crabro mediatus, Fabr. Syst. Piez. 312. 20. 

 Crossocerus subpunctatus, St. Farg. Ann. Soc. Ent. Fr. iii. 766. 3; 



Hym. iii. 170. 3. 

 Crabro subpunctatus, Van d. Lind. Obs. ii. 58. 9. 



Shuck. Foss. Hym. 147. 12. 



Curtis, Brit. Hym. xv. t. 6. 80 ? . 



Her?: Schaff. Faun. Germ. 181. 49. no. 8. t. 21, 22. 

 Blepharipus pauperatus, St. Farg. Ann. Soc. Ent. Fr. iii. 733. 5 ; 

 Hym. iii. 130. 5. 



Female. Length 4-5 lines. — Black ; head punctured and shi- 

 ning, with several irregular depressions on the vertex ; a deep 

 longitudinal depression extending from the anterior stemma to 

 the face, where it becomes a canalicula, occupying the space 

 between the eyes ; the scape yellow in front, sometimes the 

 base and apex of the scape merely rufo-fuscous ; the clypeus 

 strongly cariuated in the centre, and thinly covered with yel- 

 lowish pubescence ; the mandibles fuscous, with their apex 

 rufo-piceous, sometimes entirely piceous ; the cheeks beneath 

 armed with an acute tooth. Thorax shining and punctured; 

 the mesothorax with three central obsolete carinae at the base ; 

 the metathorax with a central longitudinal incisure and a curved 

 one which encloses a semicircular space at the base, which is 

 shining, and delicately obliquely striated, both the incisures 

 consute ; the metathorax posteriorly shining, punctured above 

 and transversely striated below, sometimes entirely so, and en- 



