JLemonia.] rimonuoA. 279 



Wai, but abundant where it ocean ; London district, Gravesend, Sheernew ; Alde- 

 burijh, Suffolk ; Bircbington, near Margate ; Hull; Uartlepool, abundant; the old 

 records from Cambridge aud Windsor probably refer to the succeeding species. 



According to several authors, H. Curtisi is merely a variety of //. 

 ', which is the name given to the British species by Stephens, 

 but of which the type form does not appear to have been recognized as 

 found in Britain ; it seems, however, to differ only in having the punc- 

 tures of the striae of the elytra and not the striae themselves black, and 

 in having the black thoracic lines more pronounced ; Weise describes 

 H. zosterce as " thorace nigro-bilineato," and H. Curtisi as " thorace 

 bimaculato," but specimens of the latter insect have the markings on 

 thorax evidently consisting of two lines. Stephens mentions the 

 inner apical angle of the elytra as being rounded in this species and 

 produced into a slight spine in the following, but it is certainly some- 

 times produced in//. Curtisi ; there is, however, considerable confusion 

 still existing between the species ; Thomson, for instance, gives H. 

 zosters, H. Curtisi, and H. GyllenhaU as distinct species, whereas by 

 Weise they are all regarded as one species. 



H. appendiculata, Panz. (equiseti, F.). Closely allied to the pre- 

 ceding, but with the spine at the apex of the elytra longer and the 

 striae deeper, more deeply punctured, and blacker; the femora are more 

 distinctly clavate, and the apex of the femora and tibiae, as well as the 

 apex of the joints of the tarsi, is black; the lateral callosity before the 

 anterior angles of the thorax is less distinct, and the thorax itself is a 

 little longer ; the general size is larger ; the species may be further 

 known by its habitat, as it is found inland, whereas //. Curtisi appears 

 to be confined to the neighbourhood of the coast. L. 5|-8 mm. 



On aquatic plants ; extremely rare ; two specimens are recorded by Stephens as 

 taken near Windsor ; the only British specimen that I have seen is one that was 

 taken by the Rev. C. F. Thornewill iu flood rubbish near Burton-on-Treut, and giveu 

 by him to me soon after I began collecting ; it is now in the collection of Mr. P. B. 

 Mason, of Burton-on-Trent. According to Weise this species occurs on Potamogeto* 

 luce** aud pectinatus and Myrioyhyllum spicatum in May and June. 



CRIOCERINA. 



This tribe contains a few genera and a very large number of species, 

 which may be known by having the antennae distant at base and the 

 first segment of the abdomen short ; the antennae are comparatively 

 short and stout, and the eyes are prominent and more or less emarginate; 

 the thorax is plainly narrower than the elytra, which are usually oblong 

 and subparallel, and have the shoulders well marked ; the first ventral 

 segment, as a rule, is scarcely longer than second, but is somewhat 

 longer in Zeugophora than in our other genera ; the last-mentioned 

 genus is in some respects inti -rmediate, and is classed by Thomson with 

 the Orsodacnidaa or Sagrina. 



