APORUS UNICOLOR. 79 



genus Evagethes of St. Fargeau, the species being synonymous 

 with the Aporus dubius of Van der Linden. 



1. Aporus unicolor. 

 A. ater; abdominis segmentis duobus anterioribus obscure rubris, 



Aporus unicolor, Spin. Ins. Lig. ii. 33 $ . 



Van d. Lind. Obs. i. 348. 1. 



St. Farg. Hym. iii. 389. 2. 

 Aporus bicolor, Spin. Ins. Lig. ii. 34 ? . 



Van d. Lind. Obs. i. 350. 3. 



St. Farg. Hym. iii. 388. 1. 



Wesm. Hym. Foss. Belg. 48. 1. 

 Aporus femoralis, Van d. Lind. Obs. i. 349. 2. 



St. Farg. Hym. iii. 383. 3. 



Female. Length 4i lines. Black; the head very convex in 

 front, with a slightly impressed line before the anterior stemma, 

 and covered with an obscure sericeous pile ; the tips of the man- 

 dibles ferruginous. Thorax covered with obscure changeable 

 pile; the metathorax truncate at the apex; wings fuscous, 

 palest at their base, their apex with a broad dark border. Ab- 

 domen : the first, second, and sometimes the base of the third 

 segment obscurely ferruginous. 



Male. Length 3i lines. Smaller than the female, entirely black, 

 and thinly covered with a delicate silky pile ; the clypeus covered 

 with silvery pubescence ; thorax as long as the abdomen ; the 

 sides of the metathorax covered with silvery-white pubescence ; 

 the abdomen slightly compressed; the wings hyaline, with 

 their apex faintly clouded. 



There is a single specimen in the National Collection, for- 

 merly in that of the late J. F. Stephens, Esq. In 1853 I cap- 

 tured two females at Southend, in the beginning of September ; 

 both my specimens were taken at the end of the heights beyond 

 the town, on a sloping bank on the shore. I took a third spe- 

 cimen, in August 1858, at Pakefield, near Lowestoft, Suffolk. 

 The description of the male is from a continental specimen. 



Fam. 4. Sphegidse, Leach. 



Prothorax : not having the posterior angles prolonged to the 

 base of the wings, narrowed in front, forming a sort of neck. 

 The basal segment of the abdomen narrowed into a long petiole. 

 Mandibles internally dentate. 



