n-."] HETEROMERA 4'.) 



5. Thorax more or less strongly narrowed at base ; upper surface 



shining, usually smooth ; size small S.vLPC>fGTVA. 



ii. Tliorax broadest at base ; upper surface clothed with a pollen- 

 like pubescence; size moderate ; (facies of LaritHvi) .... MvcrERiSA.* 



PYTHINA, 



The single genus Pytho is contained in this tribe ; it may be known 

 by the large size and very depressed form, and by the fact that the 

 intermediate coxae have conspicuous trocliautius, and that the side pieces 

 of the mesosternum attain the intermediate coxae ; the head is not pro- 

 duced into a rostrum in front, but is somewhat long before the eyes. 



FTTTHO, Fabricius. 



This genus contains seven or eight species, which are found in Europe 

 and North America ; our single British species is confined to Scotland, 

 where it is found very locally under bark of pine and fir ; the antenna? 

 are rather short and stout with the third joint longer than the fourth, 

 and they are inserted at some little distance in front of the eyes ; the 

 maxillary palpi have the last joint slightly securiform, but scarcely 

 broader than the penultimate joint ; the elytra are rather strongly striated 

 and very flat ; the legs are moderately long. 



The larva of P. depressus has been taken in Scotland, and I have before me a 

 specimen given me by Dr. Sharp ; it is about 24 mm. in length, of a dirty yellowish 

 colour (probably lighter in life), with very short legs and antenna?, of which the last 

 joint is minute and subulate ; the head is large, semicircular, and somewhat produced 

 in front ; the remainder of the segments are of much the same size and shape, and 

 a large dei-p furrow runs down the centre of all of them until the last, which is 

 slightly narrowed and furnished with two very strong slightly incurved appendages, 

 which are setose at apex ; the margin between these bears on its dorsal surface a 

 row of small dark papilla) ; the surface of the larva is glabrous, and there are no 

 setae or prominences at the sides of the segments ; it occurs under bark of fir and pine. 



P. depressus, L. Elongate, rather broad, enlarged behind, very 

 flat, glabrous and shining ; mouth, antennse, tibia?, and tarsi reddish-tes- 

 taceous ; head, thorax, scutellum, breast, and femora black ; elytra 

 blue-black or steel-blue, sometimes violet ; abdomen brown, or with the 

 sides and posterior portion often reddish-testaceous, usually entirely 

 reddish-testaceous in the male ; the sides of the thorax are sometimes 

 reddish, and occasionally part of the elytra ; head rather large, coarsely 

 and diffusely punctured, impressed in front, antenna? stout and rather 

 short ; thorax transverse, with sides rounded in front and gradually 

 narrowed behind, with a central furrow and a strong impression on 

 each side, diffusely and not strongly punctured ; scutellum almost 

 semicircular, smooth ; elytra dilated behind, with nine sulciform punc- 



* These characters apply simply to the genus Mycterus ; the position and composition 

 of the tribe is by no means settled. 



VOL. V. E 



