STATES OF INSECTS. 325 



male, but much less so in the female. In a little destruc- 

 tive beetle, common in our houses (Attagenus Pellio), 

 in the latter it is very short, but in the former it is very 

 long, and nearly formed by a single joint. In Eurhinus 

 Kirby, a New Holland genus of the weevil-tribe, in the 

 male the last joint, also, is much longer than it is in the 

 female a . These examples will give you some idea of the 

 principal variations that take place in the antennae of the 

 sexes, and of the wonderful diversity of forms in this re- 

 spect to which mere sexuality gives rise amongst insects. 

 Inthe eyes, or stemmata, this diversity is less remarkable. 

 Latreille has described two ants, Formica contracta and 

 coeca, in the neuter of which he could discover no eyes b : 

 in the former, the female, however, had large ones. The 

 male he appears not to have known, but it probably was 

 not destitute of these organs ; of the latter he was ac- 

 quainted only with the workers. The neuter of Myr- 

 mica rubra, another ant, has no ocelli or stemmata, 

 although the male and female are provided with them c . 

 They are discoverable only in the former sex of that sin- 

 gular insect related to the ants, Mutilla europcea. Other 

 insects differ in the size of the eyes of their sexes. In 

 the hive-bee, and some Ephemerce, the eyes of the drone 

 or male are much larger than those of the worker and 

 female, and also meet at the vertex, having their stemmata 

 below the conflux; whereas in these latter they are 

 widely distant d . In Stratyomis, Tabanus, and many other 



a Linn. Trans.xii. t. xxii./. 8. e. <?./. 5 . 

 b Hist. Nat. des Fourmis, 195—. 270—. 

 c De Geer ii. 1094. 



d Ibid. 650. Mon. Ap. Angl. i. t. xi. Apis xx. e. \.f. 2. J. t. xii, 

 /. 3. ? . 



