Heterogi/na and Fossorinl Hymenoptera^ 255 



very large and more elongate than in Spilomena ; abdo- 

 men sliming, its petiole rugose and longitudinally sul- 

 cate. 



Length 5 — 6 mill. 



Hah. — London district, Tunbridge Wells, Chobham 

 (bred from pierced stems of brambles), &c. 



DiODONTUS, Curt. (PI. Vn. fig. 25). 



Brit. Ent. ii. 496. 



Labrum produced and emarginate at the apex ; anterior 

 wings with two submarginal cells, each receiving a 

 recurrent nervure, the 2nd cell longer than wide ; abdo- 

 men with a short, wide petiole ; posterior tibiae more or 

 less spinose. 



(2) 1. Mandibles yellow .. ., .. .. .. minutus. 



(1) 2. Mandibles black. 



(4) 3. Thorax finely and closely punctured ; division be- 

 tween the scutellum and thorax consute . . trifftis. 



(■')) 4. Thorax with scattered punctures ; division between 



the scutellum and thorax simple . . . . luperus. 



1. niinutus, Fab. Ent. Syst. ii. p. 302. 



(? and ? black ; mandibles, tegulse, tubercles, extreme 

 apex of the femora, the base of the tibiae, and the whole of 

 the anterior tibiae and tarsi, except a narrow streak at the 

 back of the former, pale yellowish or testaceous ; the J has 

 the under side of the antennae and the intermediate and 

 posterior tarsi also pale. All the markings in the <? are 

 Ijrighter and paler than in the ? . Head finely and deeply 

 punctured, surface very finely rugose; mandibles with long 

 hairs on their outer margin ; clypeus bidentate ; 3" with 

 the face below the antennae covered with shining 

 silvery hairs ; thorax not so wide as the head, shallowly 

 and irregularly punctured, surface like that of the head ; 

 division between the mesothorax and scutellum simple ; 

 metathorax largely rugose, somewhat clathrate at the 

 base, more or less hairy at the sides ; abdomen finely 

 punctured, and covered with very short grey hairs ; apical 

 segment in the ? much more largely and strongly punc- 

 tured than the rest, its sides carinated ; 6th segment in 

 the (? with a series of bristly hairs on its apical margin ; 



