Line, the twelfth part of an inch; the ordinary measure used in entomology for the fractions of an inch, unless the insect is much more than an inch long. Linnæus, author of the binomial system, 129. great merits of, 129. Lobated, divided into equal rounded parts. Low forms of life unaffected by climate, 24. Lunate, semicircular. Lunulate, crescent-shaped. Macropis, general observations on, 222. geography of, 68. native species, 221. scientific description of, 220. strong analogy to the Scopulipedes, 222. Maculæ indicantes, 13. Mahomet prescribes honey, 91. Males, how to be united to their partners, 179. Mandibles, 30, 40. used for boring, 44. Marginal cells of wings, 45. Marginate, edged with a ridge. Mason bees, 296. Maxillæ, 30, 31. Maxillary palpi, 30, 32. number of joints invariable in Andrenidæ, 32. number of joints variable in the Apidæ, 32. Megachile, general observations on, 272. geography of, 74. infested by Cœlioxys, 275. list of native species, 271. natural history of, 273. scientific description of, 269. Melecta, general observations on, 255. geography of, 72. list of native species, 255. parasitical on Anthophora, 240. scientific description of, 255. very pugnacious, 258. Melittobia, a parasite upon Anthophora, 241. Meloë proscarabæus, parasitical on bees, 110. said to infest Andrena, 209. Mesothorax, 26, 44. Metallic colouring of bees, 248. Metathorax, 26. Metropolis, 128. Miltogramma, parasitical upon Colletes, 190. Mode of killing coloured insects, 253. Moniliform, bead-like. antennæ, 129. Monodontomerus, parasitical on Anthophora and Osmia, 302. Moths help to fertilize flowers, 13. Motives for new arrangement, 163. Mouth, organs of = trophi = cibarial apparatus, 163. Mucronated, having one or more short stout processes. Mutilla, parasitical on bees, 117. Names usually given from a sexual peculiarity, 232. Natural history, attractions of, 141. modes of treating, 140. Natural system, 139. Nature, its large operations, 8. Nectaria of plants indicated to bees by a difference of colour, 12. Nervures of wings, 44. Nomada, general observations on, 252. geography of, 72. intermittent appearance of N. Fabriciana, 230. list of native species, 250. scientific description of, 249. sexcincta infests Eucera, 235. the bees infested by them, 253. Nomenclature simplified by Linnæus, 130. Nudipedes, = cuckoo-bees or parasites, 116, 167, 249. Nylander’s mode of determining the species of Cœlioxys, 268. Obsolete, more or less inapparent. Ocelli = simple eyes = stemmata, 26, 27. Oman, no bees in the province of, 84. Osmia, general observations on, 296. geography of, 76. list of native species, 295. natural history of, 296. parasites of, 302. scientific description of, 294.