TTTE LEAF BEETLES. 



1103 



2028 (6529). Donacia piscatrix Lac, Mem. Soc. Liege, III, 1845, 113. 



Elongate, rather slender, subconvex. Color 

 above variable, bronze, green or brownish-yel- 

 low, strongly shining; grayish pubescent be- 

 neath ; antennae and legs reddish-yellow, femora 

 m part darker. Antennae stouter than in the 

 two preceding, the second joint about half the 

 length of third. Thorax quadrate, sides each 

 with two rounded tubercles, the front one more 

 prominent ; disk finely alutaceous, sparsely, fine- 

 ly and shallowly punctate. Elytral punctures 

 rather coarse ; intervals nearly flat, finely, trans- 

 versely rugose. Length 6.5-10 mm. (Fig. 476.) 



Throughout the State; common. May 

 15 -August 20. Occurs mainly on the 

 flowers and foliage of the yellow water-lily, 

 rarely on those of the white. The stouter 

 antenna?, more distinct tubercles of thorax and less squarely trun- 

 cate tips of elytra readily distinguish this from palmata, with which 

 it is most apt to be confused. 



2029 ( ). Donacia cubticollis Knab, Proc. Ent. Soc. Wash., VII, 



1906, 122. 



Rather slender; convex, male; broader, subdepressed, female. Red- 

 dish- or brownish-yellow ; head and basal joint of antennae greenish ; under 

 surface, tibiae and tarsi with a greenish tinge. Head with a deep median 

 groove. Thorax one-half broader than long, sides straight, without tuber- 

 cles ; disk very finely wrinkled, confusedly punctate and with a deep me- 

 dian groove reaching to basal fourth. Elytra with a shallow oblique de- 

 pression just in front of, and another behind, middle ; strife deeply, closely 

 and coarsely punctate ; intervals finely wrinkled. Length 9-10 mm. 



Laporte, Marshall and Whitley counties ; scarce. July 15-Au- 

 gust 15. Knab's types were from Illinois and Indiana. Occurs on 

 bullrushes. 



2030 ( -). Donacia megacobnis sp. nov. 



Elongate, slender. Cupreous, bronzed ; antennae and legs reddish-brown. 

 Antennae much stouter than in suUUis, half the length of body, the second 

 and third joints nearly equal. Thorax longer than wide, feebly tubercu- 

 late on the sides; disk with sides rugose, with fine punctures between the 

 wrinkles; median line distinct on basal half. Elytra each with tw^o dis- 

 tinct impressions, the hind one with an elongate extension reaching nearly 

 to apex; punctures rather coarse, oblong; intervals flat, densely rugose. 

 Length 7.5 mm. 



Lake County; rare. May 28. 



2031 (6536). Donacia subtilis Kunz. Mon. Neu. Schrift. Ges. Halle. II. 



1818, 14. 



Elongate, slender, subconvex. Color brassy bronzed to purplish-black ; 

 rarely bluish, shining; antennae and legs reddish-brown to piceous. Tho- 

 [70—23402] 



