MOTIONS OF INSECTS. 325 



(B. Motiffeti, K. a ), which have no claw-sucker, there 

 appears to be a cavity in the extremity of the claw- 

 joint, which may serve the purpose of one. These foot- 

 cushions are usually of a pale colour ; but in one speci- 

 men of a hairy female which I have, from Brazil, they 

 are black. The spectre genus (Phasma} exhibits no par- 

 ticular varieties in this respect. The tarsal joints of 

 the legs have cushions at their apex, which appear to 

 be bifid. They have a large orbicular sucker between 

 the claws. In Mantis the fore feet have neither of 

 the parts in question, and the others have no suckers. 

 They have cushions on the four first tarsal joints of 

 the two last pair of legs, which, though smaller, are 

 shaped much like those in Phasma. In Acrida the feet 

 have no suckers between the claws, but they are dis- 

 tinguished by two oval, soft, concave, and moveable 

 processes attached to the base of the first joint of the 

 tarsus, which probably act as suckers b . In this genus 

 there are two foot-cushions on the first joint of the tarsi, 

 and one on each of the two following ones c . The 

 species of the genus Locusta come next. This genus is 

 called Aery dium by Latreille after Geoffrey ; but, since 

 it includes the true locust, it ought to retain the name 

 Locusta given by Linne to the tribe to which it be- 



a This insect, which is remarkable for having the margin of its 

 thorax reflexed, was long since well figured in Mouffet's work 

 (ISO.^g. infimd). It has not, however, been described by any other 

 author I have met with. It is common in Brazil. Some specimens 

 are pallid, while others are of a dark brown. It is to be observed 

 that the Blattina are resolvable into several genera. 



b De Geer, iii. 421. t. xxi. /. 13. h. This author has also noticed 

 the cushions in this genus and Locusta, and the claw-sucker in the 

 latter, which he thinks are analogous to those of the fly. Ibid. 462 , 

 t. xxii./. 7-8. r P kilos. Trans. 1810. t. xxi./. 8-13. 



