STATES OF INSECTS. (Jmago.) 317 
speaking of the anfenne. And here the advantage seems 
wholly on the side of the males: since in them these 
wonderful instruments of unknown sensations are not 
only more complex, but usually more elegant, than 
those of the other sex. You will pardon me, therefore, 
if I enlarge a little more than ordinary upon a subject so 
full of interest, and say something upon the differences 
observable between the sexes—in the shape, magnitude, 
and length, number of articulations, ramification and 
plumage, and individual joints of their antennz. 
With regard to their shape, variations are sometimes 
observable between the antennze of the sexes; but this 
principally occurs in the Hymenoptera order. For in- 
stance, those of Chelostoma mazillosa, a small bee that 
deposits its eggs in little holes in posts and rails, are cla- 
vate in the female and filiform in the male *—a circum- 
stance that distinguishes in some degree those of Sphe- 
codes, Halictus, and Andrena, three other genera of wild- 
bees>. In Dinetus the male antennz are moniliform at 
the base, and filiform at the apex; the female, on the 
contrary, are entirely filiform °% 
The antennz of the sexes also sometimes differ in 
magnitude and length. ‘This is the case in the three ge- 
nera of wild-bees just mentioned ; those of the female be- 
ing thicker than those of the male, while these last are 
longer than the former. But in this tribe the males of 
the Fabrician genus Eucera are most remarkable for 
their long antennee*. With regard to the different length 
* Mon. Ap. Angl. i. Apis**. c. 2. y. t. ix. f. 7. 2.9. 8. 
» Ibid. Melitta**. a. t. ii. f. 8. 2.9. 3. and**. b. é iii. fi 6 2. 
7. 6. 6. tiv. f. 11. 9.12. 8. 
© Jurine Hymenopt. t. 11. f. 2. 
* Mon. Ap. Angl. i. Apis **. d. 1. ¢. x. f. 7. 
