STATES OF INSECTS. 335 



spicuous in the genus Euglossa, in the females of which 

 this part is triangular, very broad towards the apex, and 

 fitted for carrying a large mass of pollen paste. The 

 tibiae of the males of some Lepidoptera are remarkable in 

 this respect. That of Hepialus Hamuli is much more 

 hairy ; but in H. Hectus it is a dilated mis-shapen mass, 

 without a tarsus, and with long scales pendent from the 

 disk a . Differences of this kind also occur in the calcaria 

 or spurs that arm the apex of the tibiae of a large num- 

 ber of insects. Thus in Acanthopus Klug, a singular 

 bee, in the male the spur of the intermediate leg is dilated 

 at the apex, and armed with six strong spines, the inner 

 one larger than the rest 5 . 



But the part of the leg in which the sexes most vary 

 is the tarsus ; and this variation takes place both in the 

 number of the joints, and their form and circumstances. 

 The first case has been observed only with regard to cer- 

 tain species of Cryptopliagus Herbst, as C. Jumatus, &c. 

 in which the female is pentamerous, or having^*? joints 

 in all the tarsi ; and the male heteromerous, or havingjive 

 joints in the two anterior pairs, and only four in die 

 posterior c . With respect to the form of the tarsal joints, 

 the sexes more frequently differ ; and by inspecting this 

 part, especially in the predaceous and carnivorous Co- 

 leoptera, you may often, without further examination, 

 ascertain whether any individual is male or female. 

 Even in the slender-footed Cicindelidce^ the three first 

 joints of the anterior tarsus of the male are more dilated 

 than the two last, and covered underneath with a brush 



a DeGeeri./. vii./. 14, 15. 



h Coquebert Ittust. Icon. i. t. vi / 6. Plate XXVII. Fig. 32. 



Illig. Mag, iv. 214. Gyllenhal. Insect Suec. i. 168. 



