INDEX. 



491 



flentifera, Cypria, 420, 460, 463. 

 Deltoid Moths, Description of 



two Xew, 8-9. 

 fliaphana, Candona, 454. 

 Diaspidiotus, 338. 

 Diaspina;, 338. 

 Diaspis circulata, 339. 

 Diatoms, 190, 201, 258. 



as food of Opercularia, 316. 

 as food of Ostracoda, 416. 

 Diclvinson, J. E., note on distri- 

 bution of Prothonotary War- 

 bler, 17. 

 Dicranomyia, 197. 

 Dicranota, VJd, 196. 198. 

 Difflugia pyriformis var. nodosa, 

 313. 

 tuberculosa, 313. 

 Dineutes discolor, infection ex- 

 periment with, 363. 

 diogenes, Cambarus, 316. 

 Diplocardia, 142, 148. 288, 295. 

 communis, 138, 139, 140, 141, 



142, 148, 285. 

 eiseni, 148, 286, 287, 406. 

 riparia, 147, 148, 286, 287. 

 preliminary account of, 

 and comparison with 

 D. communis, 138-142. 

 singularis 285. 

 verrucosa, 286. 

 Diptera, 154, 155, 158, 161, 273. 

 aquatic, 150, 156, 157, 162, 163, 

 164, 184-270. 

 food of, 184. 



keys to families of imma- 

 ture, 185-189. 

 discalis, Stratiorayia, 249. 

 discolor, Dineutes, 363. 

 Disease of the Squash-bug [Anasa 

 tristift DeG.), On a 

 Bacterial, 340 -379. 

 bibliographical list in ar- 

 ticle on a, 374-379. 

 characters of, 342. 



Disease of Squash-bug— Coii^jjuffcZ. 

 growth characters of ba- 

 cillus of, uu various 

 media, 347. 

 growth and pathogenic 

 characters of bacillus 

 of, 372. 

 infection experiments 

 with, on various in- 

 sects: Box-elder bug. 

 359; Chinch-bug, 355- 

 362; grasshoppers, 360, 

 365; grul5s and cater- 

 pillars, 361; Squash- 

 bug, 350, 362, 363. 

 isolation cultures of ba- 

 cillus of, and growth 

 on agar-agar, 344. 

 microscopic characters of 



bacillus of, 367. 

 primary infection experi- 

 ments with. 341. 

 specific characters of ba- 

 cillus of, 371. 

 summary concerning, 372. 

 temperature experiments 

 with bacillus of, 369. 

 toxic properties of, 362. 

 toxic rigor produced by, 

 363. 364, 365, 366. 

 dispar, Nymphieella, 167. 

 distinctissima, Parlatoria, 338. 

 Dixa midges, 187. 

 Dixida\ 187, 188. 

 Dolichopodida^, 267. 

 Dragon-flies, 163. 



Dufour, Leon, Recherches sur 

 les Ilemipleres, cited, 1, 3. 6. 

 dugesi, Cypris, 442. 

 Duggar, B. M., On a Bacterial 

 Disease of the Squash-bug 

 {Anasa tristis DeG.), 340 379. 

 See under Disease. 



