174 Mr. E. Saunders' Synopsis of 



long as wide. Wings with their margins and the externo- 

 medial cell more or less smoky brown ; nervures dark 

 brown. Abdomen with the basal segment rugose, and 

 covered with black upright hairs, the following segments 

 finely punctured ; intermediate femora of the S largely 

 tridentate, the basal tooth the longest and narrowest, and 

 rather pointing outwards, /. e., away from the body ; the 

 central tooth somewhat truncate, the apical somewhat 

 rounded on its external margin, and pointing towards the 

 body. Length 13 — 14 mm. 



Hah. Common in many places ; its burrows, which 

 are formed in banks, have curved, tubular entrances, 

 composed of pieces of mud, &c., joined together. 



2. Odynerus melanocephalus, Gmel. 



Gmel., Syst. Nat., i., pt. v., p. 2760; Smith, Brit. 

 Foss. Hym., &c., p. 205. 



Very like spinipes, but smaller, and with the abdominal 

 bands white or pale cream-coloured instead of yellow, 

 the second band wider and more dilated at the sides ; 

 the pubescence of the head and thorax is less abundant, 

 finer and pale, the tegulse testaceous. The <? may be 

 further distinguished by the shape of the intermediate 

 femora, the central tooth being pointed instead of widely 

 truncate ; and in having a small tubercle in the centre of 

 the 2nd abdominal segment beneath ; the whole of the 

 under surface of the segment is far less polished than 

 in sjnnipes. The ? may be further known by the almost 

 truncate clypeus, and the pale antennae beneath. Length 

 9 — 10 mm. 



Hah. Not common; Isle of Wight, Bristol, Deal, 

 Hastings, Norwich, &c. 



3. Odynerus lavipes, Shuck. 



Shuck., Loud. Mag. Nat. Hist., n. s. i., p. 490 ; Smith, 

 Brit. Foss. Hym., &c., p. 204. 



The <? of this species may be known at once from either 

 of the preceding by its simple intermediate femora, and 

 by the larger and squarer vertex of its head, and its 

 prominent prothoracic angles. The ? , which rather 

 closely resembles that of melanocephalus, may be known 

 from it by its larger squarer vertex, its deeply emarginate 



