THE LEAF BEETLES. 



1107 



2039 (10,336). Donacia rufa Say, Journ. Phil. Acad. Nat. Sci., V, 1827, 

 283; ibid. II, 339. 



Elongate, convex, subeylindrical. Dark reddish-brown, shining; an- 

 tennae and legs reddish-yellow. Third joint of antennas one-half longer 

 than second. Thorax one-third longer than wide, broadest near apex; 

 tubercles on sides not prominent, median line very distinct; surface con- 

 vex, shining, marked with minute scattered punctures. Elytra with two 

 shallow impressions near middle; intervals nearly flat, almost smooth. 

 Length 7-7.5 mm. 



Throughout the State; rather scarce. April 21-October 18. 

 Occurs on leaves and about roots of skunk cabbage. The more con- 

 vex, shining and sparsely punctured thorax, wider in front,- and the 

 smoother intervals of elytra readily distinguish this from flavipes. 



II. ILemonia Lat. 1829. (A geographical name. 



This genus is represented by a single species resembling Donacia 

 in form, but distinguished by the narrow tarsi and the distinct spine 

 at outer angle of tips of elytra. 



2040 (6549). H^monia nigricoenis Kirby, Faun. Bor. Amer., IV, 1S37, 

 222. 



Elongate, slender, subconvex. Thorax, elytra and legs brownish-yel- 

 low ; head, antenna?, tarsi and under surface black. Thorax subquadrate, 

 constricted at middle, front angles rounded, prominent; surface smooth] 

 with a few coarse punctures at base. Elytra each with ten long rows of 

 punctures and a shorter sutural row; alternate intervals wider and sub- 

 convex. Length 5.5-8 mm. 



Lake County; scarce. May 20-May 28. Taken from pond- 

 weed (Poiamogeton) in the Calumet River near Pine; also in the 

 washup of Lake Michigan. Probably occurs in lakes and streams 

 throughout the northern half of State. 



Tribe II. SAGRINI. 



Small or medium-sized, oblong or elongate, roughly punctured 

 species having the head prominent, not narrowed behind; eyes very 

 convex, entire; antennae filiform, rather widely separated at base; 

 thorax not wider than head. Elytra entire, wider than thorax] 

 strongly and irregularly punctured; front coxa- conical, transverse] 

 usually prominent and contiguous; middle and hind coxaa narrowly 

 separated; tarsal claws (in our species) toothed or cleft. 



The principal paper treating of the genera comprising both this 

 tribe and tribe IV, Glythrini, is by 



Horn. — ''Studies in Chysomelidae, " in Trans. Amer Ent Soc 



XIX, 1892, 1-18. 

 Three of the four known genera are represented in the State. 



