A. W. Kymer RoB;fc:RTS 323 



9th abdominal segment (Plate XIV, iig. 3) above deeply and fairly 

 strongly punctured anteriorly. Disc with four principal furrows; the 

 middle pair, situated one on either side of the middle of the segment, 

 converging posteriorly but not meeting; the outer and longer pair nearly 

 parallel to the lateral margins of the disc. A number of irregular tributary 

 furrows join the principal ones at all parts of their length and sometimes 

 connect them. Margin of the disc raised above its level anteriorly and 

 at the sides in a rim running out into the recurved prong of the outer 

 branch of the terminal process on either side. Inner branches of terminal 

 processes pointed, with the apices all but meeting and enclosing the 

 space between the processes. The space so enclosed is nearly oval. At 

 each side of the disc, just ventral to the marginal rim, are three principal 

 oval brown tubercles, from the side of each of which a long curved seta 

 arises. A number of smaller brown setiferous tubercles are situated 

 ventral to the three principal ones. 



The anterior margin of the disc is continued down the sides in a slightly 

 sinuous raised impression almost to the arched striated border separating 

 the tergite from the sternite. A row of about twelve setae of various 

 lengths forms a line at the edge of the striated border surrounding the 

 pseudopod or anal tube. 



Mr K. L. Henriksen of the University Zoological Museum, Copen- 

 hagen, has kindly given permission for use to be made of his generic 

 table, originally published in the paper so often referred to here. Certain 

 verbal alterations have been made and the table itself altered so as to 

 include as far as possible the British genera of Elateridae, while excluding 

 those unknown to this country. I would here tender my sincere thanks 

 to Mr Henriksen. 



Larvae of British Elateridae. 



Abdomen soft, whitish ....... 



Abdomen with terga at least strongly chitinized 



Submentum triangular. Retinaculum absent . 



Submentum somewhat linear. Retinaculum present 



9tli abdominal segment with a single tooth at the apex or sim 



9th abdominal segment ending in two short processes 



9th abdominal segment simply rounded at the apex 



9th abdominal segment ending in a tooth 



Tergites punctulate. Head convex above 



Tergites densely rugose transversally. Head flattened above 



9th abdominal segment flattened above, angular at sides 



9th abdominal segment rounded above, conical 



Integument without deep punctures or rugae . 



Integument coarseh^ punctured ..... 



CardiopJiorus 



2 



. Lacon 



3 



)lv rounded . 4 



12 

 5 

 6 

 Sericosonius 

 Ludins 

 . Melanotus 

 7 

 8 

 10 



21—2 



