on the British Species of Donacia. 213 



3. Male with two tubercles on the basal segment 



of the abdomen ; posterior femora moderately 

 incrassate (entirely pale except on upper sur- 

 face), the teeth placed one before the other, and 

 somewhat approximated ; thorax punctured and 

 thickly rugulose, as are also the interstices of 

 the striae of the elytra ; third joint of antennae 

 twice as long as the second, or very nearly so : 

 form more oblong than in preceding, and colour- 

 ing more brilliant, i.e. golden-green, with the 

 inner half of each elytron more or less tinged 

 with cupreous, whilst in preceding species the 

 same part is often blackish. — D. dentala, Hoppe, 

 Ahrens, Stephens, Lacordaire, &c. 



Found by myself in the London district. 



4. Posterior femora in male moderately incrassate, 



the, teeth rather more approximated than in 

 No. 3, and placed obliquely ; legs concolorous 

 with the body ; thorax scarcely punctured, but 

 with numerous fine rugulae ; punctures of striae 

 of elytra less strong than in either of the preced- 

 ing species ; third and fourth joints of antennje 

 nearly equal. — D. Sparganii, Ahrens, Germar, 

 Gyll., Lacordaire, &c. : D. angustata and D. 

 Thalassina of Stephens' Collection; but the de- 

 scription in the " Illustrations" (iv. 269) be- 

 longs, no doubt, to the true D. angustata of 

 Kunze, an insect which seems to be peculiar to 

 Southern Europe. 



It is remarkable that the author of the " Il- 

 lustrations," with a considerable series of speci- 

 mens in his collection (under the name " angus- 

 tata"), all of which have the legs entirely dark 

 and concolorous with the body, should, in his 

 description, have given the legs as *' rufo- 

 testaceous." 



Found by myself in the London district. 

 B. Posterior femora of male unidentate. 



a. Third joint of antennee moderately long. 



5. Upper parts golden-green, with a broad cupreous 



band (parallel with, and close to the suture) on 

 each elytron. — D. dentipes, Fab., Gyll., Steph., 

 Lacord. 



