BRITISH HTMENOPTERA ANTHOPHILA. 415 



h, h. Einpliaryniv projecting under the labrum. 



i. Labrum attached to the clypeus. 

 j, j. ^clerites In the wall of the ceso'phagus formiug the floor of 



the moutli. 

 It only remains now for nie to state that it is to the beautiful 

 preparations of Mr. Enock thai all the merit o£ this paper is due, 

 and to thank kirn cordially for doing the work so well. 



UPPER SCLERITE OF HYPOPHARYNX, 

 SCALES OF MAXILL/E. 



Lateral diagrammatic view of head of Bomhus : mandibles and 

 labrum remoyed. 



CoLLETES, Latr. Hist. Nat. iii. p. 372. (PI. III. figs. 1, 2.) 

 Labrum transverse, broadly and bluntly angulated in front, 

 densely fringed with long bristly hairs. Epipharynx visible 

 beyond the hairs of the labrum, somewhat rounded in front, its 

 extreme apex pointed. Sclerites of the hypopharynx muck curved 

 and twisted ; the scales at the membranous base of the maxillae 

 represented by two or three strong bristly hairs. The maxillae 

 are rounded at the apex, and reack just to the base of the lingna, 

 round the apex tkey are fringed witk a row of skort curved 

 bristly hairs, and longer hairs, which shovr traces of branching, 

 below them ; their inner edge is very thin and membranous ; 

 tkeir surface is impressed witk irregularly disposed punctures ; 

 the reflexed under margin of the maxillae bears a row of long 

 curved bristles, these in a strong back ligkt can be seen tkrough 

 the substance of the maxillae from above. Maxillary palpi 6- 

 jointed. Paraglossae concave above, wide at tke base, remotely 

 punctured, their anterior margins witk a row of deep punctures, 

 from eack of wkick springs a curved bristle. Tke lingua is 

 deeply cleft at tke apex, its base is convex and in the form of an 

 equilateral triangle, the base of the lingua being the apex of tke 



29* 



