Thr Pond Relations of fhe Cornbido' and CoccineUida'. 53 



fiiniTiis element. Tlic otlipr o"('iu'r;i r-ci'oo-iii/fd were SentoriM, 

 UstilaiTo, Macrospiiriuni, Coleosporium, FtMoiiospora, Meiiispora, 

 and some spores of Spha»roneniei and Mvxojcrastres. 



Five adults, taken at Jacksonville, were found to liave 

 made about one-third of their food of insects, ecpially 

 divided between plant-lice and chinch-bu^s, each eaten by one of 

 the beetles. The veu^etation consisted, as usual, of pollen of 

 Composit;e (eleven per cent.), spores of lichens (two per cent.), 

 and of funtri (seventy-one per cent.). The list of the last includes 

 Septoria, Ustilairo, Helniinthosporium, Macrospoi-ium, Cladospo- 

 rium, and Penmospora. 



Two larv;e of this species, taken at th(^ same place and time, 

 ilitfered l)\it little in food, to my surpris(>, fiom the adidts just 

 mentioned. ( 'hinch-buas, plant-lice, and caterpillars, in about 

 equal ratios, with traces of unrecotrnizal)!*' insects, amount to 

 twenty-three per cent. Pollen of Composita' stands at five 

 per cent., lichen spores at seven, and spores of fungi at sixty-five, 

 iucludinrr the same o-enera as thosf" just mentioned, except Peron- 

 ospora and Septoria. 



JT. <jl((riiil)!i was reyjresented by four specimens, taken in the 

 corn-field. The differences betwecMi tluMr food and that of //. 

 conreriiins were purely trivial. Insects amount to tliirtv per 

 (!ent., all chinch-Viuo'S and plant-lic(>, twelve pei- cent, of the former 

 and ei(rhteen of the latter. The seventy per cent, of vegetable 

 food is divided about as befoi'e, between pollen of (yompositte, 

 seven per cent., and spores of funtri fifty-one per cent. Lichen 

 spores were taken more freely, however, and were estimated at 

 twelve per cent., eaten by all the beetles. The fungi were mostly 

 Cladosporivmi (forty-three per cent.), but Septoria, Uredo, Plel- 

 minth(jsporium and Peronospora likewise occur. 



Genus Coccixella. 



Six specimens of this genus were studied, three of ( '. !)-/tofat(/, 

 and three of C. 5-notata. All were from C(mtral Illinois except one, 

 which was from Jacksonville. Excluding the last, the ratio of 

 animal food eaten by these specimens was not far from two-thirds 

 of the total, all plant-lice. Only a trace of pollen of Compositjx' 

 was noticed in one of the insects. Fungus spores amounted to 

 thirty-two per cent, (about half Helniinthosporium and Ustilago), 



