1862.] PECTEN IN CERTAIN SPECIES OF BEES. 121 
ANDRENID. 
Colletes daviesana, g (teeth much the longest at the lower end). 
Andrena cingulata, dp figs. 1, 2. = Comb not 
nitida, 9, figs. 3, 4 (comb reversed near the top). 
—— clarkella, 2 (comb reversed near the base). > 
, 6 (comb reversed). 
Cilissa leporina, 2? (comb of four teeth). 
—— —-, ¢ (comb of three teeth). 
Sphecodes subquadratus, 2.” 
Halictus leucozonius, 3. | 
morio, 2. 
Dasypoda hirtipes. 
marginal, 
commencing 
near the base 
of upper joint 
of maxilla. 
Comb not present. 
ApID2. 
Panurgus banksianus, 9 , fig. 6. Comb not marginal. 
Eucera longicornis, ? (fig. 5). \ 
| 
Sin 
Bombus terrestris, 2. 
lucorum, @. 
a 8 é- 
| 
| 
| Comb on upper part of 
> Comb marginal. second joint of maxilla. 
— latreilliellus, $. 
Apathus campestris, ? . 
Apis mellifica, ¢. 
Euglossa cordata. ) 
Nomada furva, 2 x. 
Epeolus variegatus, ¢ +. | 
Ccelioxys vectis, 2 x. {Comb not present. 
Osmia rufa, 9. 
Chelostoma florisomne, 3. 
There is also an appendage to most of the maxille (and when ab- 
sent it may possibly have been torn off in dissection), which seems 
too delicate to assist in the mechanical work for which the combs are 
probably used. It isa small membranous lobe, covered more or less 
thickly with long hairs, and situated on the lower joint of the maxilla, 
on the opposite side to that of the palpus (see figs. 1, 3, 6). 
In many of the maxille there are several projections or small 
tubes (as 1 shall for convenience call them, having little doubt of 
their tubular construction) generally tipped by a hair, and in ap- 
pearance strongly resembling the small tubes which exude the mate- 
rial of the web from the spinneret of a spider. They are in various 
Situations: sometimes at the apex of the maxilla; forming some- 
times an irregular line nearly the whole length of the upper joint ; 
Sometimes in a cluster close above or below the maxillary palpus; 
sometimes in two clusters, one above and one below the palpus. I 
would call your attention particularly to the straight tubes near the 
apex of the maxilla of Epeolus variegatus 3 (fig. 7), and the flask- 
shaped tubes near the palpus in Osmia rufa 9 (fig. 8). 
* Parasites. I have as yet found no parasitic Bee with the comb. 
+ After writing the above paragraph, it occurred to me that Dr. J. Braxton 
Hicks, in a paper read before the Linnean Society (and printed in their Trans. 
vol. xxiii. part 1, p. 139), had preceded me in the observation of these organs, 
and I hesitated to send the notes for printing ; but, on examination of his paper, 
I am inclined to think that the tubes which | have described in the maxillz of the 
Bees are not necessarily of the same nature as the organs observed by him in 
