1100 FAJIIL1' LIII. C 



KEY TO GKOUPS OF INDIANA DONACIA. 



(/. Hciid and tlionix evidently puliescent above. Gi-oiip l- 



nil. Head occasionally, thorax never pubescent. 



6. Elytra truncate or subtruncate at tip. Group B. 



1)1} Elytra rounded at tip : sutural nmrgin of elytra sinuate behind the 

 middle. Gi'ouP ^'• 



Gkoup a. 



But two rndiana species belong to this group. They are widely 

 different iu size and general appearance and, except in the pubes- 

 cence of head and thorax, have little in common. 



KEY TO SPECIES OF GROt'P A. 



(I. Elytra without pubescence: liind femora slender, without a tooth. 



2022. PFBICOLLIS. 



aa. Elytra evidently pubescent ; hind femora swollen, toothed. 



2023. PUBESCENS. 



2022 (6523). Donacia' pubicollts Suffr., Stett. Zeit, 1S72, 21. 

 Elongate, ratlier robust, convex. Brown, bronzed; antennre, tibi.'e and 



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

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

 ajitennse nearly twice longer than second. Thorax longer than broad, me- 

 dian line distinct on Ijasal 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 coxre. i.ength 10-12 mm. 



Lake County; rare, ilay 20, A few specimens taken by AVol- 

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

 fore only from northern Illinois, where it occurs on \vater-lilies. 



2023 ((i.5.3S). Do.XACTA pubescens Lee, Trans. Amer. Ent. Soc, II, ISOT, 5.j. 

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



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

 stout, third .1oint one-half longer than second. Thorax slightly longer than 

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

 feebly and obt\isely tuberculate each side. Elytral punctures (>oarse. inter- 

 vals nearly flat ; tips subtruncate. Jli'susternuni narrower than coxa^. Length 

 7-9 mm. 



Lake, Kosciusko and .Marion counties; rai-e. June 9-.Tune 16. 

 Known only from Canada, lUindis and .Michigan. Occurs on pick- 

 erel weed. 



Geoup r.. 



This group comprises 14 spe-ies, among them the most common 

 enes dcciirrinu- in the State. All agree in having the elytra more 

 or h-ss truncate at apex. The form in a number of them is flattened 



