EUCHIEIK^E. 



spur found in the female, as it is in both sexes of nearly all other 

 Lamellicornia. In the latter sex the fore-legs are of normal 

 length, with the tibia rather flat and broad, and bearing at the 

 outer edge an indefinite number of sharp teeth. The front coxae 

 are not perpendicular, as in the CETONIINJE, but spread out trans- 

 versely, like those of EUTELTN.E and MELOLONTHIN^:. They are 

 nearly contiguous in the females, but strongly diverge in the males, 

 so that a large gap is formed between them. The two hinder 

 pairs of legs are moderately slender, the tibise furnished with 

 numerous sharp spines pointing backwards, but not, as usual,, 

 arranged in transverse or oblique rows. In the females the ends 

 of the hind tibiae are rather expanded or trumpet-shaped, and the 

 outer rims in both sexes are fringed with sharp spines. The front 

 tarsi in both sexes are longer than the others, and the two basal 

 joints of all are produced beneath into rather strong spines. 

 These are especially developed in the females, but the males have 

 in addition an array of rough horny projections upon the lower 

 surface of the tarsi, which are not present in the females. 

 Evidently the beetles have rather special clinging powers, but this 

 may only be necessitated by their bulky form. The claws are 

 strong, fixed and symmetrical, alike upon all the feet of male and 

 female, and strongly toothed beneath near the middle, a form of 

 claw only found in the foliage-feeding MELOLONTHIX^E amongst 

 the other Lamellicornia. Between the claws is a well-developed 

 pulvillus, bearing at the end two long sensory hairs. 



It has been asserted (by von Heyden) that the long-legged 

 individuals are the females and not the males, but this is entirely 

 wrong. In addition to the various differences in the legs already 

 mentioned, the former are distinguished by having all the tarsi 

 shorter than in the males, the pygidium more protruding and not 

 vertical, and by more or less pronounced differences in the shape 

 of the pronotum, which is relatively shorter than that of the male 

 in the genus Euchirus, and relatively longer in Propomacrus. 



The head is not large, nor the eyes very prominent, but the 

 clypeus is fairly well developed, rather hollowed out above, with a 

 broad flat anterior face. The antennae are very short, stout and 

 compact, alike in both sexes, with the six joints between the scape 

 and the three-jointed club very short and closely packed. There 

 is a peculiarity in the club which I believe is shared with no 

 other Pleurostict Lamellicorn and which, so far as I know, has 

 never been noticed hitherto, even the various figures which have 

 been published generally misrepresenting the actual structure. 

 The two external lamellae are hollowed on their inner faces and 

 their edges meet, so that they completely enclose, except near its 

 base, the middle lamella, which is smaller, shorter and thinner 

 and no doubt forms the most sensitive and important part of 

 the organ. A similar structure occurs in the Geotrupid genus 

 Bolboceras, and it probably implies either special delicacy of the 

 sensory surfaces of the antennal club, or some special risk of 

 injury to those surfaces in the particular habits of the insects. 



