. The Cambridge natural history. Zoology. It exhibits, however, considerable variety, and is seen in its simplest and least soldered state in CeiJhus. In the higher bees the pro- notum takes on a form not seen in any- other Insects, being one of the most beautiful sclerites to be found in the class (Fig. 334, pronotum of Xylocopa). "We have already remarked that in Hymen op tera the lower portions of the prothoracic segment are detached from the upper, so that the pro- notum is not supported be- neath by a sternum as usual. In the Yw. 334.âPronotum of a car- bees in OUeS- peuter bee, Xylo
. The Cambridge natural history. Zoology. It exhibits, however, considerable variety, and is seen in its simplest and least soldered state in CeiJhus. In the higher bees the pro- notum takes on a form not seen in any- other Insects, being one of the most beautiful sclerites to be found in the class (Fig. 334, pronotum of Xylocopa). "We have already remarked that in Hymen op tera the lower portions of the prothoracic segment are detached from the upper, so that the pro- notum is not supported be- neath by a sternum as usual. In the Yw. 334.âPronotum of a car- bees in OUeS- peuter bee, Xylocopa sp. ^ ^ East India. tion the pro- notum makes up for the removal of the corresponding side-pieces and sternum. Fig. of Sphex '^J becoming itself a complete ring, chnjsis. A, Dorsal aspect: ^^^ gj^ies being prolonged and meeting a, pronotum ; 6, mesouotum ; . ⢠n n i- /â j_i c,teguia; rf, base of anterior, lu the middle line 01 the under sur- of posterior, wing;/, 5., ^^^^ ^f ^.J^g -^^^^^ ^^ ^J^g g^j^^g ^^^^ ivisious of metanotum ; //, ^ a large lobe is developed laterally on each side, overlying and protecting the first breathing orifice. The intermediate Llmi;t.°\!"errt! stages of this remarkable modification pect of tiie median seg- may be observed by dissecting a small ment: a, upper part ; b, â /. r i superior, c, inferior abdomi! scnes of genera of bees. nai foramen ; d, ventral Although the prostemum of a Hymen- plate of median segment : , t- . â , n ⢠-i 1 e^ coxa. opterous insect is not usually visible owing to its being overwrapped by the side-pieces, it is really, as shown in Fig. 335, B, of complicated form. In Civibeo: and some other sawflies the side-pieces are not so large as usual, but the prosternuni is larger and is exposed. The prothoracic spiracle is rarely visible externally, but its position is remarkably constant, and is usually indicated by a peculiar lobe or angle of the pronotum projecting backwards just below. divi
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
