British Hymenoptera. 179 



11. Odynerus antilope, Panz. 



Panz., Faun. Germ. 53, 9 ; Smith, Brit. Foss. Hym., 

 &c., p. 210. 



Larger than any of the preceding species, and dis- 

 tinguishable from either trimarfiinatus or trifasciatus in 

 having a yellow band on each of the first four segments 

 in the 2 , and of the first six in the <? ; from pictus it 

 differs in having a narrower basal segment to the abdo- 

 men, with a wider, usually trisinuate, apical band, and 

 in having the tibiae black at the apex inwardly. 



The chief characteristics of the species are its large 

 size and shining metathoracic concavity. Length 14 — 

 18 mm. 



Hah. Not common near London. F. Smith says 

 " abundant in Yorkshire " ; it has also been taken at 

 Lynn, Norfolk. 



12. Odynerus parietinus, Linn, 



Linn., Faun. Suec, ed. ii., p. 418 ; Fig. Curt., Brit. 

 Ent. iii., 137. 



Very like callosus in the shape of the basal band of 

 the $ , but almost as large as antilope. All the segments 

 have apical bands. It may be known from either 

 jmrietum or callosus by the shape of the 2nd ventral seg- 

 ment ; from pictus by the narrow basal segment ; and from 

 antilope by the dull metathoracic concavity. Length 

 12—16 mm. 



Hah. Chobham ; Norwich ; Dorsetshire ; Charlwood, 

 Surrey, &c. Probably common, but mixed with parietum 

 or callosus. 



Subgenus IIL Symmorphus. 



(2) 1. Larger ; sides of mesothorax shining and almost 



impunctate . . . . . . . . . . . . crassicornis. 



(1) 2. Smaller ; sides of mesothorax punctured. 



(4) 3. Three abdominal bands only ; anterior angles of the 



thorax not mucronate . . . . . . . . sinuatus. 



(3) 4. Many abdominal bands ; anterior angles of thorax 



mucr'onate . . . . . . . . . . . . gracilis. 



