Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . complete piipii of the Iluuible-bee, and other thin-skinned Hymenopterous larvae, and in a less satisfactory way in the young Dragon-flies. If tlie larva of the Humble-bee be taken just after it has become full-fed, and as it is about to enter upon the pupa state, the elementso C^ <=3?C^ {sterno-rhah- dites Lacaze-Duthiers), ortubercles,destined to Fig. ig. form the ovipositor, lie inseparate pairs, in two groups,Fig. 14. Fig. 15. exposed disti
Guide to the study of insects and a treatise on those injurious and beneficial to crops, for the use of colleges, farm-schools, and agriculturists . complete piipii of the Iluuible-bee, and other thin-skinned Hymenopterous larvae, and in a less satisfactory way in the young Dragon-flies. If tlie larva of the Humble-bee be taken just after it has become full-fed, and as it is about to enter upon the pupa state, the elementso C^ <=3?C^ {sterno-rhah- dites Lacaze-Duthiers), ortubercles,destined to Fig. ig. form the ovipositor, lie inseparate pairs, in two groups,Fig. 14. Fig. 15. exposed distinctly to view, as in Figures 14-18. The ovipositor thus consists of three pairs of slender non-articulated tubercles, situated in juxta-position on each side of the mesial line of the body. The first pair arises from the eighth abdominal ring, and the second and third pair grow out from the ninth ring. The ends of the first pair scarcely reach beyond the base of the tliird pair. With the growth of tlie semi-pupa, the end of the abdomen decreases in size, and is. Fig. 18. 18 a. Fig. U. Rudiments of tlie sting, or ovipositor, of the Humble-bee. 8, 9, lO^sternites of eighth, nintli, anil tenth abdominal rings in the larva. «, first pair, situ-ated on the eighth sternite; b, second and inner pair; and c, the outer pair. The let-tering is the same in figures 11--2-2. The inner pair (6), forms the true ovipositor,through which the eggs are supposed to pass when laid by the insect, the twoouter pairs, « and c, sheathing the inner pair. Ganin shows that in the embryo oiloUjnema{¥\:M), the three pairs of tubercles arise from the 7th, 8th and 9th s-^g-ments respectively. Fig. 1.^), 1(1. The same a little farther advanced. Fig. 17. The three pairs now iiiipear as if together growing from the base of theninth segment: Ma, side view of the same, showing the end of the abdomen grow-ing smaller through the dnninution m size of the under side of the Ijody. Fig. 18. The three pairs of rh
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectinsects
