Pyrochroa. HETEROMERA, 63 
Y 
PYROCHROA, Geoffroy. 
The characters given for the family will serve to distinguish this our 
single British genus, except that it may be added that the maxillary 
palpi are long with the last joint elongate securiform, the antenne have 
the second joint about one-third as long as the third, and the posterior 
tarsi have the first joint elongate; the genus is the largest in point of 
numbers of those belonging to the family, and contains about a dozen 
species; three of the four European species are found in Britain, and the 
remainder have been described from Northern Asia and North America, 
one species having been taken in Java. 
The larva of P. serraticornis, Scop. (rubens, Schall.), has been described and figured 
by several authors; a detailed description, with figure, is given by Westwood (Classi- 
fication, i. p. 288, fig. 32, 11); I have also a specimen before me taken by myself in 
Nocton Wood, near Lincoln, in a rotten stump; it is long and linear, of a dirty 
ochreous colour, with the head, thorax, and apical serments corneous; the head is 
large, with short antennz and comparatively long palpi of about the same length as 
the antenne; the segments are transverse and incised at the articulations; the 
prothorax is short quadrangular, but the mesothorax and metathorax, especially 
the former, are much narrowed in front; the penultimate segment is very long, the 
preceding segment being short; the apical segment is situated at right angles to the 
penultimate, and is furnished with two strong corneous spines projecting upwards, and 
several small setose warty prominences on margin; the legs are stout and strong, and 
terminate in a simple claw ; there is a fine central furrow running down the middle 
of the segments ; the head and tail are darker than the rest of the body; the pupa is 
dirty white with the rudimental wings and wing covers very short. 
The larve of our other two British species, P. coccinea and P. pectinicornis are 
figured by Chapuis and Candéze (Larves des Coléoptéres, pl. vii. figs. 3 and 4); 
and beautiful figures of the larva and pupa of P. coccinea are given by Schiddte (xi. 
pl. xv. 1, 10) ; these larvee resemble that of P. serraticornis in general appearance, but 
differ in the shape of the thoracie segments and the anal appendages. Ahrens, who 
described the larva of P. coccinea, is inclined to believe that the larva is three years 
in attaining the full size, while the pupa state only continues fourteen days; the 
pupa is remarkable for excrescences at the sides of the thoracic segments. 
I, Head strongly dilated behind eyes; antennz of male 
pectinate or serrate; size larger. 
too headiblack .Ahe below CA) Samat VIS OP coccimmastZ? 
ue eadxedys Paiel SQ usp ep ails Aiistl kine te PSERRATICORNIS;, Sedp. 
II. Head scarcely dilated behind eyes; antenne of male 
flabellate; sizesmaller . . . Eee idle Gch. RECTINICORNIS 2): 
P. coccinea, L. Head black, thorax and elytra bright scarlet 
clothed with short and thick unicolorous pubescence ; head subtriangular, 
dilated behind eyes, impressed in male, impressed with the impression 
furrowed in female ; antennz long, black ; thorax transverse-oval, nearly 
twice as broad as long, with a more or less distinct central furrow ; 
scutellum black; elytra dilated behind, with well-marked shoulders, 
together with thorax very closely and finely sculptured; legs black, 
rather long, claws red. L. 14-17 mm. 
Male with the antenne rather strongly pectinate, the forehead with a 
broad deep impression, and the fifth ventral segment of the abdomen 
emarginate at apex, the sixth being conspicuous, 
