. The Cambridge natural history. Zoology. Fia. 324. â Development of -wing-s of Phryganeidae. (After Dewitz.) A, Portion of body-wall of young larva of Trichostegia ; c/i, chitin, forming at r a jiro- jection into the hypodermfs m; r and d forming tlms the first rudiment of the wing. B, The parts in a largely grown larva ; a, c, d, h, the much grown hypo- dermis separated into two parts by r, the penetrating extension of the chitin ; i\ mesoderm. C, Wing-pad of another Phryganeid freed from its case at its change to the pupa ; &, d, outer layer of the hypodermis, m, of the ; £&
. The Cambridge natural history. Zoology. Fia. 324. â Development of -wing-s of Phryganeidae. (After Dewitz.) A, Portion of body-wall of young larva of Trichostegia ; c/i, chitin, forming at r a jiro- jection into the hypodermfs m; r and d forming tlms the first rudiment of the wing. B, The parts in a largely grown larva ; a, c, d, h, the much grown hypo- dermis separated into two parts by r, the penetrating extension of the chitin ; i\ mesoderm. C, Wing-pad of another Phryganeid freed from its case at its change to the pupa ; &, d, outer layer of the hypodermis, m, of the ; £", inner laver without nuclei. There are about 500 species of tliis family of Insects known as inhabiting the European region, and about 15 0 of this number occur in Britain. Tliese are arranged by M'Lachlan â "âwhose zealous and persevering work at this neglected family of Insects is beyond praiseâin eight sub-families, on a system in which the structure of the maxillary palpi plays a principal part; they are called Phryganeides, Limnophilides, Sericostomatides, Leptocerides, Oestropsides, Hydropsychides, Ehyacophilides, Hydroptilides. The first three of these forni the division " Inaequipalpia.'' Phryganeides.âThis group includes the largest forms of the family, and appears to be almost confined to the tem- perate regions of the northern hemisphere, though a few species are already known from the corresponding districts of the southern hemisphere. This feature in their geographical dis- ^ Monograph of the British Trichoptera in Tr. nit. Soc. London, third series, vol. V. 1865 ; and Monographic Pvevision of the European Trichoptera, Fig. 325.âCases of British Trichoptera. A, Of Odoniocerum albicorne; A^, its ter- mination ; B, quadrangular case of (Jrun- oecia irrorata ; B^, mouth of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
