116 



TRYPOXYLON. 



took it at Nottingham, and Mr. Hewitson at Newcastle-on-Tyne. 

 In 1856 it was again captured at its old locality, Nottingham, by 

 Mr. F. C. Allen of that place. During the past season its 

 " metropolis " may be said to have been discovered : at Pake- 

 field, near Lowestoft, in the beginning of August 1858, I found 

 the species in the greatest abundance : here it takes the place, as 

 it were, of M. arvensis, which is plentiful in most situations, 

 particularly on the coast. M. sabulosus is fond of settling on 

 the Wild Carrot heads, and the males were seen in great numbers 

 running on the leaves of the Coltsfoot ; the female preys on 

 various species of Diptera. 



Tarn. 7. Crabronidae, Leach. 



The head frequently very large. The abdomen oval or ellip 

 tical, sometimes clavate, sometimes petiolated; the eyes ovate, 

 sometimes reniform. 



Genus 1. TEYPOXYLON. 



Sphex, pt., Linn. Syst. Nat. i. 941 (1766). 

 Trypoxylon, Latr. Free. Car, Ins. (1796). 

 Apius, Jurine, Hym. 140 (1807). 



Head transverse, as wide as the thorax ; eyes large, their inner 

 orbit deeply emarginate ; stemmata placed in a triangle on the 

 vertex ; antennae filiform in the female, clavate in the male, in- 

 serted at the base of the clypeus ; the clypeus transverse, convex 

 and rounded in front ; the mandibles unidentate and acuminate ; 

 the abrum concealed. The thorax ovate ; the collar transverse ; 

 the scutellum large, its posterior margin rounded; the metathorax 

 oblong, much narrower than the mesothorax, the apex obtuse ; 

 the anterior wings with one marginal and one submarginal cell ; 

 the marginal cell gradually narrowed beyond the first transverso- 

 cubital nervure, terminating in a point ; the submarginal cell re- 

 ceives the recurrent nervure near its apex ; a second and third 

 submarginal are faintly traced, the latter extending to the apex 

 of the wing ; a third discoidal cell is also traced, the second recur- 

 rent nervure entering the second submarginal near its base. The 

 legs short and simple. Abdomen elongate-clavate, the margins 

 much constricted above, that of the first forming a subpyriform 

 node. 



