. La Australian zoologo. Zoologia; Zoologia; Zoologia. RAYMENT 147. Fig. 4: dettagli Halictus cyclurus e leai Cockerell. 1. Un gruppo di piccole cellule di terracotta Halictus cyclurus Ckll. 2. Una sezione della cella che mostra una larva avanzamento sul polline-store. 3. Il vecchio il polline-mat di H. leai Ckll. si suddivide in un certo numero di scaglie salivari, e rivela il metodo di costruzione. 4. Il piccolo camino-pila oltre l'entrata dell'albero. del polline-grani, e alcuni da otto a dieci giorni sono trascorsi consumando la "pudding". Il soffice rivestimento esterno contenente più nettare non è consumato l'abete

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. The Australian zoologist. Zoology; Zoology; Zoology. RAYMENT 147. Fig. 4: Details of Halictus cyclurus and leai Cockerell. 1. A group of the small earthen cells of Halictus cyclurus Ckll. 2. A section of the cell showing a larva feeding on the pollen-store. 3. The old pollen-mat of H. leai Ckll. breaks down into a number of salivary flakes, and reveals the method of construction. 4. The tiny chimney-stack over the entrance to the shaft. of the pollen-grains, and some eight to ten days are spent in consuming the "pudding." The soft exterior containing more nectar is not consumed first as described by Fabre for his French species. Hymenopterists are almost unanimous in agreeing that the larval food of wild-bees consists solely of pollen and honey, but that is mere opinion, unsupported by either experiment or analytical chemistry. Indeed, Snodgrass (1925) goes so far as to assert that only the hive-bee Apis secretes the predigested "pap"' that is fed to the larvae. The author (1951) was able to demonstrate that Exoneura continues the progressive feeding of pap for weeks longer than the hive-bee. In all the genera investigated by the author, the six rectal glands are excessively large in species, such as Halictus. that supply only a pollen-ball for the larvae, but they are exceedingly small in other species, such as Trigona and Apis, which continues with progressive feeding of the larvae with the pharyngeal secretion over a lengthy period. Pavlovsky and Zarin (1922) concluded that the function of the glands is production of a catalase with oxidising action. In any case, the halictine glands are covered with a close network of tracheal tubules to supply oxygen. The fully grown halictine larva measures 5 mm. in length, but when the compound eyes begin to colour, about 11 weeks later, the length is reduced to 4.5 mm. The white crystaline pupa has a very large head and thorax, and a somewhat "prickly" appearance, due to numbers of nodes on va

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1910
• booksubjectzoology
• bookyear1914