324 Mr. G. R. Waterhoiise on some Heteromerous Coleoptera, 



Elytra elongated, but little broader in the middle than at the base, 

 rounded at the extremity ; distinctly broader at the base than 

 the thorax at the same part, and with a transverse ridge ; the 

 humeral angles prominent ; lateral keel distinct. 



Leffs moderate ; the tibiae simple ; tarsi rather shorter than the 

 tibiae. 



Grammicus chilensis. Gramm. rufo-piceus ; corpore elongate, sub- 

 depresso ; capita thoraceque rugoso-punctatis ; thorace bicostato ; 

 elytris singulis quadricostatis, seriatim punctatis, subtransversim 

 rugosis. — Long. corp. If lin. 



This little insect was found by Mr. Darwin at Valparaiso. It 

 is exceedingly like a Tagenia, having the small, narrow, elongated 

 form, and in having the thorax and elytra furnished with distinct 

 longitudinal ridges it will bear a still closer comparison with 

 M. Solier's genus Microtelus ; from both these genera, and indeed 

 all the TageniidcB, it differs in having the eye situated entirely above 

 the lateral groove of the head * ; from Tagenia it may moreover 

 be distinguished by the antennse being of equal width throughout, 

 the joints being less transverse, and indeed presenting a nearly 

 square outline, though rather broader than long, — by the penul- 

 timate joint being distinctly longer than the rest, and longer 

 than broad, and the terminal joint smaller and confounded with 

 the penultimate, to which differences may be added that of the 

 mentum not being notched at the side. The long head and equal 

 joints of the antennse (if we except the last two) at once distin- 

 guish the present insect from Microtelus ; the epistoma or clypeus 

 moreover is not emarginated in front, and in the genus last men- 

 tioned we do not find the penultimate joint of the antennse longer 

 than the rest. 



The two longitudinal keels on the thorax divide its dorsal sur- 

 face into three equal parts, and the interspaces are flat : the keels 

 or ridges of the elytra are nearly equidistant, sharp and distinct ; 

 and in the interspaces are two rows of distinct punctures, each 

 row being placed close to a ridge ; and there are moreover some 

 irregularly transverse rugse, but these are by no means strongly 

 marked. 



* In Leptinoderes I find the nearest approach, in the extremely con- 

 tracted condition of the eye, to the present insect. 



