ABSTRACT This contribution results from an investigation of four commercially obtained colonies of Bombus (Pyrobombus) impatiens Cresson in an attempt to understand the functional anatomy and behavior of its immature stages. Eggs are described in detail, and their chorionic microstructure is contrasted with that of Bombus (Cullumanobombus) griseocollis (De Geer). They are deposited in groups consisting of a few to more than nine eggs into a single chamber. The study confirms that larvae pass through four instars. Although increasing in size dramatically from one instar to the next, larval anatomy and behavior change little during the first three instars. The last instar is the one that commences defecation and production of silk resulting in cocoon construction. In contrast to most bees, its larval activities result in substantial changes in size and shape of its brood chamber, whereas brood chambers of most bees are constructed by the female and modified little by the offspring. This study is a part of a series of investigations into the similarities and differences in the developmental biologies among corbiculate bees.

中文翻译：

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Corbiculate Bees 的发育生物学：Bombus impatiens，包括对其卵羽化的观察

摘要 这一贡献来自对四个商业上获得的 Bombus (Pyrobombus) 凤仙花 Cresson 菌落的调查，旨在了解其未成熟阶段的功能解剖结构和行为。详细描述了鸡蛋，它们的绒毛膜微观结构与 Bombus (Cullumanobombus) griseocollis (De Geer) 的绒毛膜微观结构形成对比。它们以由几个到九个以上的卵组成的组存放在一个房间中。该研究证实，幼虫经过四个龄期。尽管从一龄到下一龄，体型急剧增加，但在前三龄期间，幼虫的解剖结构和行为变化不大。最后一龄是开始排便和生产蚕丝导致结茧的一龄。与大多数蜜蜂相比，它的幼虫活动导致其育雏室的大小和形状发生了重大变化，而大多数蜜蜂的育雏室由雌性建造，后代几乎没有改变。这项研究是对球状蜜蜂发育生物学的相似性和差异性进行的一系列调查的一部分。