290 Mr. E. Saunders' Si/nojysis of British 



the area of the metathorax finely striate near the 

 margins. 



Length 5 — 6 mill. 



London district, Chobham, Hastings, Norwich, &c. 



16. dimidiatus, Fab. Ent. Syst. ii. p. 298. Fig. Panz. 

 Fami. Germ. 46, 8. 



Head and thorax black ; mandibles more or less 

 piceous, and sometimes yellow ; scape of the antennae in 

 the ? yellow, with a black line above ; two spots on the 

 collar, a line on the post-scutellum, and sometimes the 

 scutelhmi itself yellow ; abdomen with a band on 

 the basal segment near the apex, two small round spots 

 on the 2nd segment, two larger transverse lateral spots 

 on the 3rd and 4th, and nearly the whole of the 5th and 

 6th yellow. ' The <? is generally darker, having the 5th 

 and 6th segments often unspotted, and the 7th pale at 

 the apex ; in some ? the body is nearly entirel}^ yellow, 

 with only a narrow black band at the base of the 

 2nd and 3rd segments ; in some <? the body is nearly 

 entirely black, with only a narrow band on the basal 

 segment, and a spot on each side of the 3rd, yellow. 

 (? with the anterior and intermediate tibiae in front, and 

 the posterior tibiae at the base, and sometimes also near 

 the apex, and all the tarsi, yellow ; 2 with all the tibiae 

 and tarsi yellow, with generally a black spot on the 

 former in front. Head shining, shallowly punctured ; 

 vertex with two deep impressions united posteriorly in 

 the ? , and the face channelled ; these impressions are 

 less strongly marked in the S' ; thorax somewhat shining 

 and shallowly punctured in the J" , dull and very closely 

 punctured in the ? ; metathorax with the basal area 

 shining, crenate at the base, surrounded by an im- 

 pressed line, and widely sulcate down the centre ; 

 sides of the metathorax more or less hairy, especially in 

 the 3" ; abdomen shining, somewhat petiolated, with the 

 basal segment about once and a half as long as wide, 

 regularly elongate-ovate, apical segment in the ? largely 

 punctured ; posterior tibiae in both sexes irregularly 

 spinose ; anterior tibiae in the <? triangularly produced 

 near the base beneath. 



Length 12 mill. 



Hah. — Common in many places, and generally distri- 

 buted. 



