CRABRO WALKERI. 135 



femora also fimbriated beneath at their base, yellow testaceous 

 within, with a yellow or testaceous stain behind ; the anterior 

 tarsi fimbriated on the edges, and as well as the intermediate 

 pair yellower than in the other sex ; the abdomen narrower and 

 more elongate. 



An abundant species, widely distributed. This insect provi- 

 sions its nest with a small species of gnat. 



13. Crabro Walkeri. 



C. niger, orbitis internis oculorum mandibulisque flavis ; raeta- 

 thorace laevi ; abdomine ov^to-conico. 



Crabro Walkeri, Shuck. Foss. Hym. 170. 29. 



Wesm. Hym. Foss. Belg. 140. 20. 

 Crabro aphidium, Dahlb. Hym.Europ. i. 368. 189 (nee St. Farg.). 



Male. Length 3 lines. Black; shining and loosely punctured; 

 a delicately impressed line between the posterior stemmata ex- 

 tending beyond them, and a deeper one in front of the anterior 

 one reaching to the face, which is slightly canaliculated, smooth 

 and shining, with a yellow line at the inner orbit of the eyes ; 

 the clypeus yellow and slightly convex, very much produced in 

 the centre in front, and densely covered with silvery pubescence ; 

 the scape yellow, with a black line behind ; the mandibles yel- 

 low, with their apex rufescent ; the palpi pale testaceous. 

 Thorax shining and finely punctured ; the metathorax with a 

 smooth, shining, cordate space at its base, the sides of which in 

 front have a few delicate curved striae ; in its centre is a longi- 

 tudinal incisure, which, as well as that which encloses it, is con- 

 sate ; the metathorax transversely striated behind ; a spot on 

 each side of the collar, and the tubercles, yellow ; the wings hya- 

 line and iridescent, the nervures piceous, the tegulse testaceous ; 

 the legs yellow, the anterior femora with a black stain behind 

 and ferruginous beneath, the tibiae with a black stain below ; 

 the intermediate femora behind and the tibiae beneath with a 

 black stain ; the posterior femora black, the tibiae with a black 

 stain at the apex above ; the anterior and intermediate tarsi 

 pale yellow, with the claw-joints rufo-piceous ; the posterior 

 tarsi piceous, with their basal joint yellow. Abdomen elongato- 

 conical and subpubescent ; the margins of the segments testa- 

 ceous, the tip of the apical segment ferruginous. 



This species is unique in the Shuckardian Collection, in the 

 possession of T. Desvignes, Esq. Its precise locality is not 

 known. 



