292 MONOGRAPHIA IIYDR/ENARUM ANGLI/E. 



Art. XXXII. — Monographia Hydrcenarum Angl'uc. 

 By George R. Waterhouse, Esq. 



Gen. 1. — Amphibolus.^ Waterhouse. 



Maxillary palpi shorter than the thorax : basal joint long, bent, the 

 two terminal joints short : antennae, with the two basal joints, 

 very long and slender, the rest forming an elongate club : legs 

 moderate : tarsi four-jointed : head large : eyes prominent : thorax 

 with the sides more or less dilated : elytra convex, elongate, 

 ovate. 



This genus forms a beautiful link between the two genera, 

 Hydrana and Ochthebius, having the usual colouring of the 

 former, suffused with a sub-metallic tint, in which respect it 

 approaches the latter : it also approaches nearer to the genus 

 Ochthebius, in having the elytra larger than the abdomen, and 

 in the form of the legs ; but the palpi are nearly three times 

 as long as in that genus, though not so long as those of 

 Hydrcena. 



Not having a specimen myself, and Mr. Davis (who kindly 

 lent me the one from which the description was made) having 

 but one specimen, I am unable to dissect, the only means 

 by which I might give a more accurate description of the tarsi 

 and antennae. 



Sp. 1. Amp. atricapillus. Piceo-testacea, submetallica ; capite 

 nigro, magno, postice pimctato ; oculis prominentibus ; 

 thorace lateribus dilatatis, dense ptinctato, foveis quatuor 

 impressis : elytris ad basin thorace vix latioribus, elongato- 

 ovatis, convexis, j^unctato-striatis ; abdomine minimo : an- 

 tennis, ptedibus, palpisque pallidt fulvis. (Long. corp. 

 i lin.) 



1 have seen but one specimen of this interesting species^ 

 which was taken at Hebden-bridge by Mr. Gibson. 



Gen. 2. — Hydr^na. Kugellan. 



Head large, triangular, truncated in front: thorax subquadrate,. 

 with the sides more or less dilated : scutellum minute : elytra 

 more or less ovate, elongate : legs long : tarsi very slender, 

 the terminal joint very long : antennae minute, 8 ?-jointed, the 



* 'Afj.<p'L$o\os, duhius. 



