386 EXTERNAL ANATOMY OF INSECTS. 



a Calx (the Heel). The curving part of the Planta, by 



which it inosculates with the Tibia. 

 B Digitus (the Toe). The remaining joints of the Tar- 

 sus taken together a . It includes the Allux and Un- 

 gula. 

 a Allux (the Toe-ball). The last joint but one of the 

 Tarsus, when remarkable, as in Rhyncophorous 

 beetles (Curculio L.) b . 

 b Ungula (the Claw-joint). The last joint of the Tarsus, 

 which bears the claws c . It includes the Arthrium, 

 Unguicidi, and Plantula. 

 a Arthrium (the Arthrium). A very minute joint at 

 the base of the claw-joint, in most Tetramerous and 

 Trimerous beetles d . 

 (6 Unguiculi (the Claws). One or two pair of moveable 

 incurved claws, which usually arm the apex of the 

 Ungula e . 

 y Plantula (the Plantula). A minute accessory joint, 

 sometimes attached within the claws to the apex of 

 the Ungula f . Ex. The Lucanida?. It includes the 

 Pseudonychia. 

 * Pseudonychia (the Spurious Claws). Two stiff claw- 

 like bristles, that terminate the Plantida s. 

 C Sole a (the Sole). The underside of the TarsusK It 



includes the Pulvilli. 

 a Pulvilli (the Pulvilli). Cushions of short hairs very 

 closely set; or of membrane, capable of being in- 



a Plate XXVII. Fig. 25, 26. x". 



b Plate XXVI. Fig. 47, 48 • and XXVII. Fig. 43. r. 



c Ibid, s: <i Plate XXVI. Fig. 47, 48. d*. 



e Plate XXVII. Fig. 37—57. e*. f Ibid. Fig. 56, 57./*. 



s Ibid. Fig. 56. a-ty. b Ibid. Fig. 59. if". 



