CLASS VIII. ORDER V. 101 



means of the pectoral spine starting from the ab- 

 dominal foramen. 



LAMPYRIS, (glow-worm,) antennae filiform ; 

 wing-sheaths flexile ; thorax flat, semiorbicular^ 

 concealing and surrounding the head ; abdomen 

 with the sides plaited into papillae ; female wing- 

 less (in most species.) 



CANTHARIS, antennae setaceous; thorax margi- 

 ned, shorter than the head ; wing-sheaths flexile ; 

 abdomen plated into papillae on the sides. 



PTINUS, (plant-thief,) antennae filiform, with 

 the three last joints largest; thorax roundish with- 

 out distinct margin, receiving the head occasion- 

 ally. 



Section C. Tarsus with five joints ; palpi four $ 

 antennae enlarged at the end or laminated. 



HISTER, antennae headed by a somewhat solid 

 tip, lowest joint compressed and decurved ; head 

 retractile ; mouth forcipated ; wing-sheaths short- 

 er than the body ; fore legs toothed. 



SILPHA, (protector,) antennas thickening, to- 

 wards the tip ; wing-sheaths margined ; head 

 prominent, thorax flattish, margined. 



DERMESTES, (leather-chaffer,) antennae clavate, 

 with perfoliate tip, the three last joints larger than 

 the rest ; thorax convex, scarcely or very slightly 

 margined ; head withdrawn at pleasure beneath 

 the thorax. 



BYRRHUS, antennas clavate, subsolid, subcom 

 pressed. 



HYDROPHILUS, (driver,) antennae clavate-per- 

 foliate; hind legs villose and formed for swim- 

 ming. 



