. The Cambridge natural history. Zoology. PHRYGANEIDAE 475 is large, but is nearly perpendicular in direction, and is much concealed by the elongate, free front coxae, which repose against it. The metathorax is intermediate in size between the pro- and meso-thorax ; its side-pieces are rather large, but the sternum is membranous, with a heart-shaped piece of more chitinous consist- ence in the middle, entirely covered by the middle coxae. The side-pieces both of the meso- and meta-thorax are large, and are closely connected; the middle and posterior coxae are very large, elongate, and prominen
. The Cambridge natural history. Zoology. PHRYGANEIDAE 475 is large, but is nearly perpendicular in direction, and is much concealed by the elongate, free front coxae, which repose against it. The metathorax is intermediate in size between the pro- and meso-thorax ; its side-pieces are rather large, but the sternum is membranous, with a heart-shaped piece of more chitinous consist- ence in the middle, entirely covered by the middle coxae. The side-pieces both of the meso- and meta-thorax are large, and are closely connected; the middle and posterior coxae are very large, elongate, and prominent, and the middle pair slope backwards, so that their tips are in contact with the tips of the hind pair. The abdomen is cylindric and rather slender ; it looks as if formed of eight segments in addition to the terminal segment; this latter in the male usually bears remarkably modified appendages. The first ventral plate is sometimes, if not always, entirely membranous; indeed the texture of the segments is in general very delicate, so that they shrivel up to an extent that renders their comprehension from dried specimens very difficult. The legs are always elongate, the coxae attain- ing in some forms a remarkable length, and the tibiae and tarsi are armed with many spines; the tarsi are five-jointed, slender, frequently very elongate, terminated by two large claws and an apparatus, placed between them, consisting of a pair of hair-Uke processes with a fig. 321 membranous lobe. The structure of the mouth-parts of the Phryganeidae has given rise to much difference of interpretation; it has recently been investigated by E. Lucas ^ in connexion with Ana- boliafurcata (Fig. 321). He agrees with other observers that mandibles are present in the pupa, but states that no rudiment of them exists in the imago. He calls the peculiar structure formed by the combination of the maxillae and 1 Arch. Naturcjcs. lix. 1893, Band I. p Front view of head of Anabolia furcata after removal o
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
