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Show 78 INst!;.CTA. the form of which, as well as that of the tube itself, varies accord· ing to the species. In fixing their portable dwelling, they so manage it that the aper-ture, which is at the point d'appui, is never obstructed. The nymph is furnished anteriorly with two hooks, which cross each other and somewhat resemble a rostrum or snout. With it, when the period of its last metamorphosis has arrived, it perforates one of the grated septa in order to procure egress. Hitherto immovable, it now walks or swims 'Yith agility, by means of its four anterior feet, which are free? and furnished with thick fringes of hairs. The nymphs of the large species leave the water altogethe1·, and climb on various bodies, where their final change is effected. The small ones simply rise to the surface, where they are transformed to winged Insects, in the manner of the Culices and va· rious Tipularire; their exuvium serves tl}em for a boat. In some the inferior wings are evidently wider than the others, and plaited. SEnxoosTOMA, Lat. Where, in one of the sexes, the maxillary palpi are in the form of valvulre, covering the mouth in the manner of a rounded snout, and triarticulated; under them is a thick and cotton-like down. Those of the other sex are filiform, and consist of five joints( 1 ). PHRYGANEA proper. Where the mouth is similar in both sexes, and the maxillary palpi are shorter than the head and thorax, and hut scarcely pilose. P. grandis; Rces.; Insect., II, Ins. Aq. cl, 2, xvii. The largest species in France; antennre as long as the body; superior wings greyish-brown, with cinereous spots, a longitudinal black stripe, and two or three white dots at their extremity. The tube of its larva is invested with little pieces of bark, or ligneous matters arranged horizontally. P.striata, L.; Geoff., Insect., II, xiii, s. About an inch long; fulvous; eyes black; nervures somewhat darker than the rest of the wing. P. rhombica; Rres., Insect., II, Ins. Aq., cl, 2, xvi. Length ( 1) A genus established on a species from the environs of Aix, sent to me by M. Boyer de Fons-Colombe, and which has bt:en also l>rought from the Levant by M. de Labillardiere. NEUROPTERA. 79 seven lines and of a b d rown yellow; a lar e h' an lateral spot on the . . g , w 1te, rhomboidal rl'h supenor wwgs ' e tube o f I· ts 1a rva is covered . •h . me?ts of shelJs( 1 ). Wit httle stones and frag- . Certa~n species, such as the filosa uad . . h"ta, mgra, have excessi vel 1 ' q rifascwta, longicornis 1 Y ong antennre d .1 ' a so extremely long and dense) . ' an max1 lary palpi y pllose. They form the su b genus MvsTAOIDA, Lat. In t?e others the four wings are narrow and without plicre. To th" d' . . ' lanceolate, almost equal 1s 1 visiOn belongs the ' HvnnoPTILA, Dalm. nesWs(~h)e.r e the antennre are shor t, almost granose, and of equal thick- .Ano~her subgenus-Psyc/tom ia- . With Similar wings hut . h?/ mtght be formed of Phrygane"" ' In w Ich the t "" ceous, as in almost all the others W fan ennc:e are long and seta-dens of France on the 1 .f e. requently observe in the gar- . ' • eaves o vanous h b active species, the body of which . f s ru s, a very small and annulated with white· it IS ulvous brown, and the antennc:e scribed. ' appears to me to be new or imperfectly de- ORDER IX. HYMENOPTERA(S). . In this family we still find fou wmgs, and a mouth com r m~mbranous and naked posed of mandtbles maxill""" d ' c.u an two (1) For the other spe . (2) Anal. Ento~., p. ~~~s, see Fabricius, De Geer and Rresel. .(3) The Piezata, Fab. |
