178 Mr. E. Saunders' Synopsis of 



might be confounded with it. The thorax is generally 

 entirely black, with the exception of a narrow line on the 

 prothorax, and two spots on the tegulse of the ? ; the 

 bands of the abdomen are all linear throughout and 

 narrow ; there is one on each of the first five segments, 

 and a spot on the apex of the 6th in the ? ; the tibiae and 

 tarsi are pale, more or less tinged with red. The 2nd 

 segment of the abdomen beneath is convex longitudi- 

 nally beyond the costate sulcature, and its ventral sur- 

 face thereby considerably above the level of the costae. 

 The basal segment of the abdomen also is unusually 

 broad in this species. Length 10 — 13 mm. 



Hah. Not common. Wandsworth ; Bristol ; Portland ; 

 Isle of Wight ; Weybridge. 



Very like the following, but distinguishable, as pointed 

 out under its description. 



9. Odynerus trimarginatus, Zett. 



Zett., Ins. Lapp., p. 456; Smith, Brit. Foss. Hym., 

 &c., p. 209. 



Very like pictiis, but differing in having only three 

 abdominal bands, and the basal segment of the abdo- 

 men narrower in proportion to its length. Length 

 10—13 mm. 



Hah. Widely distributed. Walmer and Kingsdown, 

 Kent ; Lowestoft ; Littlehampton; Hayling Island ; Loch 

 Eannoch, Perthshire. 



10. Odynerus trifasciatus, Oliv. 



Oliv., Enc. Meth. vi., p. 688 ; Smith, Brit. Foss. Hym., 

 &c., p. 208. 



Very like parietum and parietinus in colour, but more 

 elongate, the thorax being decidedly longer than in any 

 other species of the section ; the tibiae are widely black 

 at the apex inwardly, and narrowly fuscous at the base 

 in the ? , black in the S ; the abdomen has three yellow 

 bands, and sometimes an indication of a 4th ; the basal 

 band generally dilated at the sides. Length 8 — 12 mm. 



Hah. London district, &c. 



Easily recognised by its elongate shape. 



