418 MR. E. SAUNDERS OlS- THE TONGTJES OP THE 



long, and the membrane uniting them bears down the middle two 

 darker chitini/.ed straps, each of whicb narrows towards its apex, 

 which is abruptly turned inwards, terminating just above the 

 base of the submentum, so that there is no hinge by which tbe 

 meutum &c. can be thrown forwards : possibly the elasticity of 

 the membrane may be such that the bee by an extra effort can 

 stretch it, but in any case the apparatus employed seems to 

 be strangely different in these two genera from what it is in their 

 allies. 

 Halictus, Latr. Hist. Nat. xiii. p. 364. (PI. III. figs. 9-11.) 



Almost exactly similar to Spliecodes in its oral arrange- 

 ments, but with the labrum more transverse ; the paraglossae 

 more developed and produced into two elongate parallel-sided 

 processes densely fringed with branched hairs ; lingua longer, its 

 sides rounded nearly to the apex, then slightly sinuate, the hairs 

 of the surface of the lingua also longer than in Sphecodes, and 

 distinctly branched towards the apex, otherwise the description 

 of that genus Avill apply in all essential points to this. 



Andrena, Fair. Sijst. Ent. p. 376. (PI. IV. figs. 1-3.) 

 Labrum transverse, fringed with long bristly hairs ; epi- 

 pharynx triangular. Scales at the base of the maxillse well 

 developed, elongate oval, bearing several long bristles, some of 

 which are more or less branched. Maxillse extending to about the 

 widest part of the lingua, somewhat rounded at their apices and 

 fringed with hairs, their inner edge narrowly membranous, and 

 their reflexed under margin with a row of closely-set bristles 

 observable through the transparent substance of the maxilla ; 

 palpi 6-jointed. Paraglossae transparent, truncate at the base, 

 which is margined with a narrow band of darker chitine, im- 

 pressed with a row of punctures ; apex of each j)roduced into a 

 lobe trausversely ridged and set with short bristles like the 

 lingua. Lingua a little more than twice as long as wide, finely 

 ridged transversely, and clothed with short hairs, those at the 

 apex longer. Beneath, with the mentum elongate, four times as 

 long as wide at the apex j submentum elongate, hyaline. Lora 

 represented by the apical triangular arcli formed by the convex 

 scleritic apical portion of the membrane investing the space 

 between the cardines ; in tbis character Andrena seems to 

 approach closely to Colletes and Prosopis, but the ends of the 



