56 MODERN CLASSIFICATION OF INSECTS. 



let go its hold. According to Olivier and Lacordaire, the insects of 

 this genus make a noise somewhat like a grasshopper, by rubbing the 

 hind thighs against the margins of the elytra. M. Laporte has pub- 

 lished a monograph upon this genus in Silbermann's Revue Ento- 

 mologique, No. 7. Another of the exotic genera, Oxycheila Dej., is 

 distinguished by having the upper lip very long, pointed in front and 

 notched at the sides. According to M. Lacordaire, the species of 

 this genus fly more heavily and run slower than the Cicindelae, and 

 hide themselves under stones during the heat of the day : they also 

 emit an acute sound when handled, by rubbing the posterior femora 

 against the elytra, as does also the species of which the genus Eu- 

 prosopus is composed. The upper lip is also greatly developed in 

 my genus Distipsidera {Jjg. 1. 12.). 



The genus Theratesl^air. (Eurychile J5o«e//«) is remarkable in having 

 the internal maxillary palpi rudimental {fig. 1. ii) and the tarsi with 

 the penultimate joint dilated and heart-shaped {fig. 1. 13.). From 

 this circumstance Bonelli (who had made the interesting observation, 

 that in general those insects which creep upon the ground have simple 

 tarsi, whilst in those which frequent plants they are more or less di- 

 lated,) was led to suppose, that the Therates seeks its prey upon plants in 

 the same manner as the Calosoma. I have, however, elsewhere shown, 

 that in this family, at least, such an observation does not entirely 

 prevail {An7iales Sc. Nat.) : the genera Euprosopus and Iresia, for 

 instance, which are known to be tree insects, have the tarsi, even in 

 the males, but slightly dilated, as is indeed the case in Calosoma, 

 whilst some of the apterous, and consequently terrestrial species in 

 the family (Tricondyla, Ctenostoma,) have the anterior tarsi in the 

 males greatly dilated. The structure of the tarsi is very different 

 between those insects in which the dilatation is merely sexual, and 

 confined to the fore legs, and the true herbivorous Coleopterous 

 insects, in which all the tarsi in both sexes are dilated and cushioned, 

 and which is also the case even in the genus Collyris {fig. 1. 14. 

 anterior tarsus, (J . 1. 15. ditto $ .). Of the exotic genera, Collyris Fabr. 

 (Colliuris Latr.) Tricondyla, Therates, Procephala, and Ctenostoma 

 are distinguished by their very narrow form, and by their thorax, which 

 is globose in the middle. Of the last named genus I have published 

 a detailed account in the Zoological Journal, No. 17. The Brazilian 

 genus Iresia is distinguished from all the other genera by having the 

 terminal joint of the labial palpi longer than the penultimate. The 



