156 CRABRO CHRYSOSTOMUS. 



Male. Length 4 lines. Black ; the antennae 12-jointed, the fifth 

 and sixth joints emarginate beneath ; the metathorax as in the 

 female ; the anterior femora ferruginous above and in front, 

 and yellow beneath, their tibiae ferruginous in front and yellow 

 above ; the tarsi piceous, the first joint and base of the second 

 pale, the first reddish at the base; the intermediate tibiae 

 yellow above and ferruginous in front; the posterior tibiae 

 yellow, with a black stain in front and a ferruginous one be- 

 hind ; the intermediate and posterior tarsi rufo- ferruginous, 

 their basal joint more or less yellow ; abdomen as in the female, 

 with the addition of a narrow fascia, or two or three spots on 

 the sixth segment. 



Probably the most abundant and generally distributed species 

 in Europe. I have bred this species from pieces of decaying 

 Willow. It burrows in decaying trees of all kinds, and pro- 

 visions its nest with Diptera. 



32. Crabro chrysostomus. 



C. niger, flavo-maculatus ; clypeo aurato ( $ argentato) ; meta- 



thorace rugoso. 

 3f fl $. Antennarum articulo tertio ad sextum subtus emarginatis. 



Crabro fossorius, Van d. Lind. Obs. ii. 51. 10 $ (nee Linn.}. 

 Crabro chrysostomus, St. Farg. Ann. Soc. Ent. Fr. iii. 704. 7 ? ; 

 Hym. iii. 107. 7. 



Herr. Sch'dff. Faun. Germ. 181. 22. t. 13 <? . 

 Crabro xylurgus, Shuck. Foss. Hym. 139. 9. 

 Crabro lapidarius, Dahlb. Hym. Europ. i. 405. 272. 

 Wesm. Hym. Foss. Belg. 151. 32. 



Female. Length 5-5J lines. Black; head and thorax closely 

 and finely punctured, the head large and subquadrate ; a deli- 

 cately impressed line runs from near the hinder margin of the 

 vertex to the deep concavity on the front ; the clypeus carinated 

 in the centjre, slightly emarginate in front, and, as well as the 

 inner orbits of the eyes, densely covered with golden pubescence ; 

 a thin pale golden pubescence on the cheeks; a line on the 

 mandibles and the scape yellow. Thorax : the hinder portion 

 of the mesothorax and the scutellum longitudinally rugose ; the 

 metathorax with a deep longitudinal central incisure, the base 

 irregularly obliquely striated, the posterior portion transversely 

 so ; an interrupted line on the collar, and sometimes a spot on 

 the tubercles, yellow ; the tibiae yellow, the anterior and in- 

 termediate pairs black beneath ; a fuscous line on the anterior 

 and posterior pairs within ; the extreme apex of the tibiae black ; 



