668 EXTERNAL ANATOMY OF INSECTS. 



slender, is longer than the thigh ; in Hololepta macu- 

 losa it is longer and more dilated ; in Lamia marmorata, 

 or one related to it from Brazil, the intermediate pair are 

 longer; in Ateuchus gibbus and others of that tribe the 

 posterior thighs are smaller than the tibiae : and, to men- 

 tion no more ; in Callichroma latipes the posterior tibia 

 is wider than the part last named. Again, the tarsi are 

 as long as either tibia or thigh in many of the larger Dy- 

 nastidce, as Megasoma Action, &c. ; longer than either 

 in Melolontha subspinosa F. ; and in Tiphia, Scolia and 

 affinities, often as long, or longer than both together. 



As to shape, — the thigh, especially in the fore-leg, varies 

 considerably : most generally it is flat, linear, and a little 

 thicker where it is united to the tibia, on the outer 

 side convex, and concave next the body ; but in many it 

 is gradually thicker from the base to the apex : in some 

 Cerambyces (C. thoracicus) it is clavate; in others of this 

 genus and Molorchus they may be called capitate; in 

 Pterostichus they are rather lanceolate ; in Onitis Sphinx 

 the humerus is triangular, and the intermediate thigh 

 rhomboidal ; in Bruchus Bactris it is bent like a bow ; 

 and in some Brazilian Halticce it is nearly semicircular. 

 The humerus in Phasma is attenuated at the base ; in 

 Empusa gongyloides it is at first ovato-lanceolate, and ter- 

 minates below in a kind of footstalk a ; in Phasma Jla- 

 belliforme it is dolabriform b ; in Mantis often semioval 

 or semielliptical, and thickest at the inner edge, which 

 affords space for two rows of spines with which it is 

 planted. In Phyllium siccifolium all the thighs are fur- 

 nished on both sides with a foliaceous appendage nearly 



a Stoll Spectres t. xvi. /. 58, 59. b Ibid. I. xviii. /. 65, 



