132 CRABRO LEUCOSTOMA. 



Spbex leucostoma, Linn. Faun. Suec. 414. no. 1663 ; Jysr. Nat. 

 i. 946. 36. 



Villers, Ent. iii. 273. 13. 



Crabro leucostoma, Fabr. Syst. Ent. 376. 43; Mant. i. 297. 27; 

 Ent. Syst.ii. 301.27. 



Rossi, Faun. Etrus. ii. 91. 882. 



Christ. Hym. 262. 



Otiv.Encycl. Me'th. vi. 518. 35. 



Van d. Lind. Obs. ii. 61. 24. 



Shuck. Foss. Hym. 153. 15. 



Zett. Ins. Lapp. 444. 9. 



Dahlb. Hym. Europ. 341. 223. 



//err. Schaff. Faun. Germ. 48. 56. 



Wesm. Hym. Foss. Belg. 133. 11. 

 Pemphredon leucostoma, Fabr. Syst. Piez. 314. 1. 

 Crabro bidens, Halid. Ent. Mag. i. 516 $ . 

 Crossocerus leucostoma, St. Farg. Hym. iii. 180. 13. 



Female. Length 4-5 lines. Black; the head shining; the vertex 

 with several irregular depressions and a few minute scattered 

 punctures ; a deep longitudinal impression in front of the 

 anterior stemma, extending to the face, which is canaliculated, 

 smooth and shining ; the side of the scape with a yellow line ; 

 the inner orbit of the eyes and the clypeus covered with silvery 

 pubescence ; the tips of the mandibles piceous. The thorax 

 smooth and shining, with a few scattered minute punctures ; 

 the mesothorax with two central parallel impressed lines running 

 to the disk ; the metathorax with a deep longitudinal central 

 incisure, the subcordiform space at its base smooth and shining, 

 the line by which it is enclosed subdefmed, sometimes very 

 indistinct, beyond it is minutely punctured ; the mesosternum 

 has on each side, behind, a minute tooth ; the tegulse and ner- 

 vures piceous ; the wings hyaline and iridescent, with a fuscous 

 cloud beyond their centre ; the posterior tibiae subclavate ; the 

 tarsi generally piceous, the anterior pair slightly ciliated ; the 

 intermediate and posterior tibiae spinose. Abdomen shining, 

 with the margins of the apical segments sometimes piceous, the 

 apex ferruginous. 



Male. Length 3-4 lines. The antennae simple, the clavolet 

 fimbriated beneath ; the clypeus with a strongly produced tooth 

 on each side : otherwise like the female. 



This species is universally distributed over the country ; it 

 burrows in decayed wood, particularly the dead parts of trees, 

 furnishing its nest with various species of Diptera. 



