278 PHYTOPHAGA. [Donacia. 



Female with the upper side aeneous or coppery, and more shiny, the 

 thorax closely punctured, the liftli ventral segment broadly truncate 

 at apex, the posterior femora more slender and armed with a small 

 tooth, and the elytra punctate-striato with the interstices distinctly 

 strigose. 



On aquatic plants, Carex, &e. t May and June ; local and not common; Horsell 

 (Surrey). Battersca, Greenwich, Maidstone ; Birchiugton ; Dover; Winchester; 

 Devon ; Bristol ; Swansea ; Knowle, near Birmingham ; Cambridge. 



HJETCONXA, Curtis. (Macroplea, Hoff.) 



This genus contains at present about thirteen species, of which five 

 are found in Europe, and the remainder have been described from 

 North America and Mexico ; three or four of the recently described 

 species appear to be now considered as merely synonyms of former 

 species; they much resemble Donacia in shape, but may be easily 

 known by their non-metallic upper surface, and the strong spine at the 

 external apical angle of elytra ; the tarsi are very long, the first three 

 joints not being pilose beneath, and the onychium being as long or 

 longer than the preceding joints and terminated by very strong claws. 



The larva of Jfeemonia Cttrtisi differs from that of Donacia in having no ocelli or 

 labial palpi, and the antennae consisting only of two joints, and more particularly in 

 the fact that one of the stigmata is situated on the under-side of the prothorax. 



I. Spine at apex of elytra shorter; average size 



smaller ; posterior femora scarcely clavate at apex . H. C0BTI8I, Lac. 



II. Spine at apex of elytra longer ; average size 



larger; posterior femora distinctly clavate at apex . H. APPENDICFLATA, Panz. 



(equiseti, F.) 



H. Curtisi, Lac. (Gyllenhali, Lac. ; zosteres, var. Curtisi, Weise). 

 Head black, thorax testaceous with two black lines or spots on each, 

 elytra testaceous with black punctured lines, under-side black clothed 

 with yellowish-silvery pubescence, which is sometimes golden, legs 

 clear testaceous with the tarsal joints more or less fuscous ; head closely 

 punctured, impressed, antennae long, dark with base lighter, pubescent, 

 inserted near one another ; thorax about as long as broad, very finely 

 sculptured, with the anterior angles slightly prominent, and the sides 

 rather strongly contracted a little behind these, disc with two black 

 lines or patches, elytra much broader than thorax, gradually contracted 

 towards apex, with the external angle produced into a sharp spine, 

 and the internal angle obtuse, almost rounded, or produced in a small 

 tooth ; the striae are black with black, moderately strong, punctures ; 

 legs long, yellow, tarsi more or less fuscous. L. 4-6 mm. 



Male with the first ventral segment of the abdomen longitudinally 

 impressed, female with the first ventral segment even, and the posterior 

 tibiae bisinuate internally. 



On Potamogeton pectinatus and Zottera marina, in brackish water near the coast ; 



