BEITISH HYMElfOPTEBA ANTHOPHTiA. 417 



shallowly emarginate anteriorly ; its surface ^pfinely ridged and 

 clothed with long irregularly curved hairs. Beneath, the mentum 

 is a good deal widened anteriorly, about twice and a half as long as 

 wide ; it has a strong ridge running nearly parallel to its external 

 margin ; labial palpi 4-jointed. The submentum is short and 

 hyaline. Lora wanting : what acts as such is the thickened apical 

 portion of the membrane which covers the space between the 

 cardines ; this thickened portion is convex, and so forms an arch 

 at its apex, to the centre of which the submentum is attached; it 

 is therefore evident that the play of the lora affords very little 

 power of extension to the tongues of the species of this genus. 



Sphecodes, Latr. Rist. Nat. xiii. p. 368. (PL III. figs. 6-8.) 



Labrum at the base broader than long, its sides somewhat 

 rounded and converging towards the apex ; apical margin emar- 

 ginate, sides and apical margin, except just the centre of the 

 latter, bearing a row of thick spiue-like bristles, these are 

 situated just within the actual margin ; epipbarynx subtrian- 

 gular. Sclerites of the hypopharynx double on each side, the 

 outer one terminating below the apical margin of the labrum, 

 and uniting, or nearly uniting, at its base with another sclerite, 

 which passes diagonally down the side of the expanded membrane 

 which invests the base of the cibarial apparatus ; this mem- 

 branous bag is peculiarly developed in this genus and Halictus, 

 and its surface covered with transverse rows of very short bristly 

 hairs ; near the juncture of the two sclerites above mentioned, the 

 membrane gives rise to two or three long upright bristles, which 

 appear to me to represent the scales at the base of the maxilise, 

 which are so much more developed in the other genera. The 

 maxillae are rounded at the apex, their inner edge very finely 

 and transparently membranous, the thicker portion of the maxillae 

 remotely punctured ; palpi 6-jointed. Paraglossae membranous 

 and transparent, somewhat falcate. Lingua convex above, longer 

 than wide, its sides rounded to the apex, which is somewhat 

 bluntly pointed, its surface finely ridged, the ridges bearing rows 

 of short bristles. Beneath, the mentum is not quite three times 

 as long as wide ; the labial palpi are 4-jointed ; the submentum 

 is very short and transparent, in fact it is not easy to trace its 

 shape at all. The lora, so far as I can make out, do not exist at 

 all, either in this genus or in Halictus. The cardines are very 



