BRITISH HTMENOPTEHA ANTHOPHILA. 427 



nearly twice as long as the lirst two joints of tlie labial palpi. 

 Mentiim beneath about 3| times as long as wide, slightly widened 

 towards the apex, where it is deeply trilobate. Labial palpi with 

 the first three joints sheath-like, and only the apical one cylin- 

 drical and divergent ; the basal joint is very short, not a quarter 

 so long as the 2nd, the 3rd is about half as long as the 1st, and the 

 4th distinctly longer than the 3rd. (I must here correct an error 

 which, I regret to see, occurs in my synopsis, Trans. Ent. Soc. 

 Lond. 1884, p. 213. I there say of the labial palpi " apical joint 

 much shorter than 3rd; " and I may remark also that F. Smith, 

 in his ' Catalogue of British Hymenoptera,' pt. 1, figures this 

 genus on pi. viii. as having the apical joint very short, and I fear 

 I must have taken my measurements from him.) Submentum 

 short, in the form of an elongate triangle ; lora strongly deve- 

 loped; cardines long and slightly curved. 



Heeiades, Spin. Ins. Lig. ii. p. 7. 



I have only dry specimens of this genus, but the maxillse and 

 the upper sclerites of the mentum and the paraglossse appear to 

 be arranged much as in Chelostoma ; the labial palpi differ from 

 those of tlie species of that genus in having the terminal two 

 joints divergent and cylindrical, instead of only the terminal one ; 

 the submentum is very elongate, and the lora has very long arms ; 

 the maxillse at the base are clothed with very long plumose hairs ; 

 the cardines are long and straight. 



Etjcera, Scop. Ann. Hist. Nat. iv. p. 8. (PL IX. figs. 1-3.) 



Labrum semicircular; epipharynx angularly pointed; mem- 

 branous base of the maxillse bearing two small narrow sclerites, 

 widening towards their apex and approaching each other apically, 

 dark at their base and nearly hyaline at their apex ; at the base 

 of the hyaline portion near its exterior margin is a small dark 

 spot out of which rises a bristle, and there are two other bristles 

 emerging from the dark portion. These sclerites appear to me 

 to be homologous with the scales in the other genera, although 

 much less developed ; from their bases extend two other much 

 larger sclerites, of a pale horn-colour, elongate, slightly widened 

 at the apex, adpressed to the membrane, with their exterior 

 apical angles rounded ; they reach almost to the base of the dark 

 opaque portion of the maxillse : I have seen nothing like them in 



