ll'H) FAMILY LIII. — CHRYSOMELID.T:. 



KEY TO GKOri'S OF INDIANA DONACIA. 



(I. Ilt'.-ul and tlmrax evidt'iitly jiubcsceiit aluive. Group A. 

 tid. Head oc-casioiially. thorax lU'vcr itubeseeut. 



h. Elytra truncate or subtruncate at ti]). Group B. 



hh. Elytra rounded at tip: suliiral uiaruhi of elytra sinuate heliind the 



middle. Group V. 



Guoup A. 



But two Indian;) species l)el(>n,i^' to this grotij). They are widely 

 dififercnt in size and g-eneral ai)T)earance and, except in the pubes- 

 cence of head and thorax, have little in common. 



KEY TO SPECIES OF GROUP A. 



(I. Elytra without pubescence; bind femora slender, without a tootli. 



2022. PUBICOLLI.S. 



aa. Elj'tra evidently pubescent; hind femora swollen, toothed. 



2023. PUBESCENS. 



2022 (G523). Donacia pubicollts Suffr., Stett. Zeit., 1ST2, 21. 

 Elongate, rather robust, convex. Brown, bronzed ; antennte, tibije and 



tarsi dusky; femora reddish-yellow. Head, thorax, scutellum and under 

 surface clothed witli short gray, but not dense, pubescence. Third joint of 

 ajitenn.'e nearly twice longer tlian second. Thorax longer than broad, me- 

 dian line distinct on basal half; sides with an obtuse tubercle in front of 

 middle ; disk finely and densely punctate. Elytral punctures small, rounded, 

 rather close set in more or less irregular rows; intervals rugulose; tips 

 rounded. Mesostemum narrower than cox;e. Length 10-12 mm. 



Lake County; rare. INIay 20. A few specimens taken by Wol- 

 cott along the beach of Lake Michigan, near Pine. Known hereto- 

 fore only from northern Illinois, whei'o it occurs on water-lilies. 



2023 (6538). Donacia pubescens Lee, Trans. Amer. Ent. Soc, II, 1867, 55. 

 Elongate, slender, subconvex. Pale reddish-brown, everywhere rather 



densely clothed with short, silky, golden hairs. Antennre piceous, rather 

 stout, third joint one-half longer than second. Thorax slightly longer than 

 broad, feebly constricted near middle, broadly channeled on median third; 

 feebly and obtusely tuberculate each side. Elytral punctures coarse, inter- 

 vals nearly flat ; tips subtrnncate. Mesosternum narrower than coxae. Length 

 7-9 mm. 



Lake, Kosciusko and Clarion counties; rai'e. June 9-June 16. 

 Known only from Canada, Illinois and IMichigan. Occurs on pick- 

 erel weed. 



GRoiip B. 



Tliis group c(>iii])rises 14 s{)(vi(>s, among tluMii tlie most common 

 ones occurring in the State. All agree in having the elytra more 

 or less truncate at apex. The form in a number of them is flattened 



