72 SERRICORNIA. [Trachys. 



very short broad form, which is almost triangular, being wide in front 

 and much narrowed behind ; the antennae have the five last joints 

 serrate, and the femora are not dilated ; the thorax is transverse, and is 

 strongly produced in the middle of base ; the genus is rather an exten- 

 sive one, comprising, as at present known, more than ninety species ; 

 twelve of these occur in Europe, and the remainder are widely dis- 

 tributed ; the majority, however, appear to occur in the Malay Penin- 

 sula and the adjacent region ; several species have comparatively 

 recently been described from Siberia and the Amur district and Japan, 

 which makes it probable that the genus will ultimately prove to be very 

 much larger than is at present known. 



The larva of T. minuta is figured iu two positions by Schitfdte (Part iv., pi. ii., 

 f. 18 and 19) ; it presents a very curious appearance, owing to the very large pro- 

 thoracic segment into which the small head is sunk, the very short mesothorax, 

 which is, however, as broad as the prothorax, and the large number of scansorial 

 warty appendages, of which eight pairs are dorsal and seven pairs ventral ; the sides 

 of the segments are also furnished with large knobbed prominences which are 

 slightly setose, and the segments themselves are much incised at their junction; the 

 ninth segment is much narrower than the preceding, and the anal appendage seems 

 as if it were a continuation of the latter segment ; the larva is light-coloured, with 

 the scuta dark ; these latter are small, with the exception of that on the prothorax, 

 and vary considerably in shape, that on the raetathorax being almost cruciform, and 

 those on the first seven segments of the abdomen being almost hammer-shaped ; the 

 legs are obsolete : this larva mines the leaves of the hazel, on which plant the perfect 

 insect is very often found. 



There are three British species, which may be distinguished as 

 follows : 



I. Upper surface black with more or less distinct whitish 



pubescence. 



i. Size larger ; upper surface more depressed ; elytra 

 with punctuation not strong, and more or less con- 

 fused T. MINUTA, L. 



ii. Size smaller; upper surface more convex; elytra with 

 punctuation strong, and arranged in more or less 

 regular rows T. PUMIIA, III. 



II. Head and thorax coppery; elytra dark blue, with the 

 punctuation rather strong, and arranged in more or 



less regular rows T. TBOGLODYTES, Oyll. 



T. minuta, L. Black, with a slight aeneous reflection ; form short 

 and broad, narrowed behind ; head smooth, very strongly impressed 

 between eyes; antennae short, with the last five joints serrate ; thorax 

 much broader than long, narrowed in front, with two transverse impres- 

 sions on each side, finely and not distinctly punctured ; scutellum very 

 small ; elytra broader tban thorax, with shoulders strongly marked, 

 rather depressed and uneven on disc, much narrowed towards apex, 

 irregularly and indistinctly punctured, with four well-marked wavy 

 bands of depressed whitish hairs, which are sometimes more or less 

 obsolete; legs black, tarsi very short. L. 2-3 mm. 



By beating ^ allows, hazels, &c. ; local; London district, not uncommon, Cobhani, 



