306 STATES OF INSECTS. (Imago.) 
with long hairs*. In that remarkable genus Acanthopus, 
of which the male only is known, the first and last joint 
of the intermediate tarsus have a dense external brush 
of stiff hairs, which probably is also a sexual character”. 
Another sexual kind of clothing is exhibited by the fe- 
males of those bees that have their labrum or upper-lip 
inflexed (Megachile)*. ‘Their abdomen is covered un- 
derneath with a brush of stiff hairs, involved in which 
they carry the pollen they collect. In the males of some 
of this tribe, as of M. Willughbiella, the first four joints 
of the anterior tarsus on their inner side have a long 
dense fringe of incurved hairs‘: a circumstance also to 
be found in the same sex of Xylocopa latipes, in which 
the claw-joint also is bearded*. In Andrena the last 
dorsal segment of the abdomen of the same sex is fring- 
ed, while that of the male is naked‘. In the humble- 
bees (Bombus), the mandibles of the male are bearded 
with curled hairs, while those of the females and neuters 
are without them. Some bees, as Andrena and Halictus, 
have the anus of the female bearded, and that of the 
male naked : in some Bombycide the reverse takes place. 
iii, With regard to the general shape of their body, 
the male and female usually resemble each other: but 
there are some exceptions to this rule. The male of the 
hive-bee is much thicker and more clumsy than either 
the female or the worker; but.in Halictus the males are 
* Kirby Mon. Ap. Angl. i. t..xi. Apis **, d. 2. a. B.f..18 a.b. c. di 
> Coquebert Illustr. Icon. i. t. vi. f. 6. 
© Kirby Mon. Ap. Angl. i. Apis **..c. 1. c.,%*. c..1. 6. **. C.-2.nct. 
sai yay Chaar AAG Ady ea og ea 
4 Ibid. t. viii. f. 28, f. g. © Christ. Hymenopt. t. iv. f. 3. 0. 
* Kirby Mon. Ap. Angl. i. t. iv. Melitta **. c.f. 1. a. 
