Ayaricopktcgvs.] CLAVICOHNIA. 39 



Crotch and tlien dropped as being only a small ccjrftaloles, and I .should 

 prefer to consider Dr. Power's specimens as all belonging to the latter 

 species, were it not for Reitter's determination ; A. prcecellens, Hampe, 

 the third European species, is regarded by Keitter as synonymous with 

 A. cephulotes; it is plain therefore that the species are all very closely 

 connected. 



HYDNOBXUS, Schmidt. 



This genus contains about eight species, two of which are found in 

 North America and one in Chili ; the others occur in Europe ; four of 

 these have hitherto been discovered in Britain ; they have, as a rule, 

 been considered very rare, but one or two have lately been found in 

 large numbers ; Rye added a fourth species, H. spinipex, Gyll., but after- 

 wards withdrew it, believing that his specimen was only a highly 

 developed male of H. strigosus ; H. spinipes appears, however, to be more 

 closely related to II. pmictatus (of which it has been by some authors 

 considered as the female) than to H. strigomts ; the genus resembles 

 Triarthron in having all the tarsi 5-jointed, but differs from that genus 

 in having the club 5-jointed with the second joint small, as in Anisotoma. 



Our species may be distinguished as follows : 



J. Size larger (3|-4 mm.) ; punctuation very coarse; 



side margius of elytra set with fine hairs . . . . H. rtHKlsi, Fairm. 

 II. Size smaller (lj-2i mm.); punctuation finer; 



side margins of elytra without hairs, 

 i. Length 2-2^ mm. ; club of antenna; nearly 

 always dark, lat joint plainly narrower than the 

 penultimate. 



1. Colour variable, nearly always pitchy black, 

 but sometimes ferruginous; punctuation of 

 elytra somewhat confused ; male with the 

 posterior femora armed with a large trian- 

 gular recurved tooth H. PUNCTATISSIMCS, Steph. 



2. Colour always ferruginous or reddish -yellow; 

 rows of punctures on elytra regular, those of 

 the interstices being almost as strong as those 

 of the regular striae ; male with the posterior 



femora armed with a spiuiform tooth . . . H. ruKCTATUS, titurm. 

 ii. Length l^-lj mm.; club of antennae reddish 

 testaceous, last joint hardly, if at all, narrower 

 than the penultimate H. STIUGOSUS, tichwidt. 



H. Perrisi, Fairm. Oblong ovate, somewhat depressed, varying in 

 colour from ferruginous (in somewhat immature specimens) to dark 

 reddish-brown, which latter is the usual colour of the insect ; the elytra 

 are often obscurely darker at suture ; head large, rather strongly punc- 

 tured ; antennae short, with well-marked blackish club, the last joint of 

 which is narrower than the penultimate ; thorax narrower than elytra, 

 narrowed in front, broadest behind middle, and thence narrowed to base, 

 posterior angles very obtuse, almost rounded, upper surface thickly and 



