KJ6 CRABRO WESMAKLI. 



14. Crabro Wesmaeli. 

 C. niger; thorace flavo-maculato, metathorace liEvi. 



Crabro Wesmaeli, fan d. Lind. Obs. ii. 63. 26. 



Shuck. Foss. Hym. 164. 24. 



Dahlb. Hym. Europ. i. 312. 192. 



li'csm. Hym. Foss. Belg. 137. 17. 

 Crossocerus Wesmaeli, 5/. Farg. Ann. Soc. Ent. Fr. iii. 783. 20 ; 

 Hym. iii. 186. 19. 



Female. Length 2-&\ lines.— Black ; head shining and deli- 

 cately punctured ; a slight longitudinal channel between the 

 stenimata, which does not extend beyond them ; on each side 

 of them an oblique smooth depression; an impressed line in 

 front of the anterior stemma which extends to the face, which 

 is caualiculated, smooth and shining; the inner orbit of the 

 eves, the lower portion of the cheeks, and the elypeus densely 

 covered with silvery pubescence, the elypeus carinated in the 

 centre ; the scape yellow beneath, its extreme apex, as well as 

 that of the pedicel, ferruginous ; the mandibles testaceous or 

 vellow in the middle, with their apex ferruginous. Thorax 

 "shining and delicately punctured ; the metathorax with a con- 

 sute cruciform incisure, the transverse one curving upwards 

 and enclosing a smooth shining space ; the posterior portion 

 with minute scattered punctures ; the collar with a transverse 

 band, sometimes interrupted, the tubercles, extreme base of 

 the wings, and a spot on the scutellum, yellow ; the wings hya- 

 line and iridescent, their nervures piceous, the tegulae rufo- 

 piceous ; the tibia? yellow, the anterior and intermediate pair 

 black beneath, as we'll as the apical half of the posterior pair ; 

 the tarsi rufo-testaceous, with their base more or less yellow ; 

 the anterior pair ciliated exteriorly, and all the tibiae spinose. 

 Abdomen elongate-ovate, the basal segment narrowed into a 

 petiole ; the apical segment coarsely punctured, the tip ferrugi- 

 nous ; the sides of the abdomen and the fifth segment finely 

 pubescent. 



The Male differs in having the antennae and mandibles black ; 

 in sometimes wanting the yellow spots on the collar ; the abdo- 

 men being more elongate, and not ferruginous at the apex. 



This species is occasionally met with in the London district, 

 but is apparentlv much more abundant in the North ; I captured 

 it in Yorkshire "in the month of July, and on one occasion ob- 

 served it at Charlton near Greenwich, burrowing in a bank of 

 fine sand, furnishing its nest with minute species of Diptera be- 

 longing to the genera Phytomyza and Notiphila : I found it very- 

 abundant at Pakefield, near Lowestoft, Suffolk, in August 1859. 



