338 ACADEMY OF NATURAL SCIENCES 



densely and confluently punctured ; the longitudinal line, as well 

 as the lateral tubercles, indistinct ; color brassy-green : elytra a 

 little inequal near the suture ; slightly truncated, and not de- 

 curved at tip : with regular distinct strise of punctures : beneath 

 dusky silvery gray : feet dull rufous ; posterior thighs with a 

 small tooth ; all the thighs a little dusky above. 



Length less than two-fifths of an inch. 



This species is nearly equal in size to the palmata Oliv., which 

 is the D. anea of Melsh. Catal. ; but that common insect has the 

 dorsal thoracic line and lateral tubercles well defined, the third 

 joint of the antennae nearly double the length of the second, and 

 the tips of the elytra more profoundly emarginated; the thorax 

 is moreover transverse. I may observe, with respect to the 

 palmata, that the male only has the anterior tarsi dilated. 



[Previously described as D. suhtilis Kunze. — Lec] [283] 



2. D. METALLICA. — Cupreous ; antennae and feet rufous; se- 

 cond and third joints of the former equal. 



Donacia metallica Melsh. Catal. 



Body above cupreous, polished : head densely punctured, 

 nearly opaque, with an acute impressed line transversely in- 

 dented in the middle ; tubercles and lateral lines none : antennae 

 pale rufous ; rather short ; less than half the length of the body ; 

 with short joints, the second and third equal, the fourth nearly 

 equal : thorax convex, gradually a little narrowed to the base, 

 decidedly longer than broad, very highly polished, with very dis- 

 tinct scattered punctures, an impressed, acute line; lateral tu- 

 bercle obtuse, obvious ; small tubercle of the anterior angle dis- 

 tinct from the large tubercle, subacute ; posterior submargin in- 

 dented : elytra, striae with impressed punctures ; a single obso- 

 lete indentation passes from the humerus to the suture before 

 the middle ; tip much decurved, rounded : beneath greenish sil- 

 very : feet pale rufous : posterior thighs with a broad prominent 

 angle. 



Length about three-tenths of an inch. 



Var. a. Antennae and feet dusky. 



Var. b. Green ; antenna and feet obscure rufous. 



The thorax is more convex and polished than in most other 

 species. I have received a specimen from Dr. T. W. Harris, of 

 Milton, Massachusetts. 



[Vol. V. 



