DOLERUS H^MATODIS. 173 



costa and stigma black, the latter with the lower half occasionally 

 fusoous. 



Length 4 5 lines.* 



This species is easily known by the colour of the 

 tegulae and pronotum. As Zaddach has remarked, the 

 abdomen changes its form very much when dried. 



The rT wants the red colour on thorax entirely, 

 the antennaa are slightly shorter than the body and 

 dull black, the head is more narrowed behind, and there 

 is on the eighth abdominal segment in front a short 

 keel. 



The larva feeds on various species of Juncus, and I 

 have also seen it on Scirpus lacustris, but possibly this 

 may have been accidentally. It is very like the larva 

 of D. palustris in form and coloration, having the 

 upper part of the body black, the sides and belly white, 

 with a greenish tinge, a more or less well- developed 

 mark over each of the thoracic legs, and the head with 

 more or less of the vertex and the eyes black. 



It is found in June and July, and pupates in the 

 earth without spinning a cocoon. 



It is a tolerably common form, appearing at the 

 end of May and June. In Scotland it has been found 

 near Glasgow and at Aberdeen (Trail), and in England, 

 in the Midland Counties, Worcester, Devonshire, Nor- 

 folk, and the London district. 



It is found throughout all the European subregion. 



Obs. Zaddach (1. c.) is not quite sure as to ccerulescens being the $ . 

 He describes the as having the antennae fuscous and longer than the 

 body, their length being, however, subject to some variation. Zaddach 

 says further that the <$ is recognised from that of J). nigra by having 

 the head smaller and more elegantly formed, and distinguished also in 

 that the pad-like elevation projects from the round and raised vertex 

 on each side, and behind is limited by a furrow running parallel with 

 the hind border, and before through a similar low furrow, it being for 

 the most part smooth, shining, and bluish black. 



