. Elementary text-book of zoology. Zoology. 554 INSECTA. forms of the insects. The head bears tolerably long setiform an- tennse, and, as a rule, aggregated ocelli, in place of the facetted eyes. The mouth-parts consist of mandibles and maxilla?, which can be retracted into a sort of atrium. In this case an apparatus for attachment with gland is often present on the ventral side of the first abdominal segment. Trachea? are completely absent in many Collembola (Podura), while in Gampodea they present very simple relations. There are only three pairs of stigmata, and the trunks which spring from
. Elementary text-book of zoology. Zoology. 554 INSECTA. forms of the insects. The head bears tolerably long setiform an- tennse, and, as a rule, aggregated ocelli, in place of the facetted eyes. The mouth-parts consist of mandibles and maxilla?, which can be retracted into a sort of atrium. In this case an apparatus for attachment with gland is often present on the ventral side of the first abdominal segment. Trachea? are completely absent in many Collembola (Podura), while in Gampodea they present very simple relations. There are only three pairs of stigmata, and the trunks which spring from them 'do not anastomose. On the penultimate abdominal segment there are often setiform filaments, which when forcibly bent ventralwards serve as a springing apparatus (springing fork fig. 460, a). Fam. Campodidse ( 45'.)). The body is elongated, and the abdomen has ten segments and ends with two filaments. Japi/.r f/igas Br., Cyprus. ./. xolifiigux Hal., Cumpodca sta-phylimis Westw. Fam. Poduridae, spring-tails (fig. 4(iO, a). The body is stout, globular, or elongated. The ab- domen is usually reduced to a few segments, and has a ventral organ for attachment, and ends with a long, ventrally-bent fork, used in springing. Smyntltunts sl-giui-tiis Latr., Podura titjitatica Deg. Fam. : Lepismidae (fig. 4(50, Z»). Body arched, elongated, and thickly covered with metallic shining scales. The abdomen has ten segments, and terminates with a long median seta and two weaker lateral setea;. Lephma xnccharlna L., MacJt Ills polijpoda L. Order '2.—ORTHOPTERA.*. ft FIG. 460.—a, Podura. cillosa. b, Lepiainn saccharinn (regne animal). Insects with an incomplete metamorphosis, with two usually unequal pairs of ^o^nys. Jaws adapted for bitiny. The name of this order, which was borrowed from the wings, is by no means suitable for all the forms included, and a very great variety prevails, both in the external appearance and in the internal * A. Serville, " Histoire naturelle des I
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
