Pythide.] HETEROMERA| 4) 
i. Thorax move or less strongly narrowed at base ; upper surface 
shining, usually smooth; sizesmall . . . . . . . . . SALPINGINA. 
ii, Thorax broadest at base; upper surface clothed with a pollen- 
like pubescence ; size moderate; (facies of Larinus) . . . . Mycrerina.* 
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 cox have conspicuous trochantins, and that the side pieces 
of the mesosternum attain the intermediate coxe; the head is not pro- 
duced into a rostrum in front, but is somewhat long before the eyes. 
PYTHO, 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 antennz 
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 mea 
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 antennx, 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 deep 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 papillx; the surtace of the larva is glabrous, and there are no 
sete or prominences at the sides of the segments; it occurs under bark of fir and pine. 
PR. depressus, I. Elongate, rather broad, enlarged behind, very 
flat, glabrous and shining ; mouth, antenne, tibize, 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, antennz 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 
