Smithsonian miscellaneous collections . ing the dorsal wall of theatrium (Atr), and is then continued into the wall of the ventral de-pression of the external larval head (A). When the atrium is exposedby cutting away the covering membrane (C) there is seen projectinginto it from the anterior end of the dorsal plate of the sucking appa-ratus a small conical lobe (Lm) with a minute sclerotic tip. This lobeis clearly the larval labrum; in a first instar larva the sclerotized tip islarger and forms a conspicuous tooth. The buccopharyngeal skeleton of the cyclorrhaphous larva is no. 3 METAMORPHOSI
Smithsonian miscellaneous collections . ing the dorsal wall of theatrium (Atr), and is then continued into the wall of the ventral de-pression of the external larval head (A). When the atrium is exposedby cutting away the covering membrane (C) there is seen projectinginto it from the anterior end of the dorsal plate of the sucking appa-ratus a small conical lobe (Lm) with a minute sclerotic tip. This lobeis clearly the larval labrum; in a first instar larva the sclerotized tip islarger and forms a conspicuous tooth. The buccopharyngeal skeleton of the cyclorrhaphous larva is no. 3 METAMORPHOSIS OF A FLYS HEAD—SNODGRASS perhaps generally regarded as a structure distinctive of the larva, sincemost entomologists do not seem to have observed that it is almost areplica of the supporting skeleton of the sucking pump of the adultfly, which is commonly known as the fulcrum of the structure in the fly (fig. 3 F) consists of the clypeus (Op) anda pair of lateral plates (/), called the paraclypeal phragmata, inflected. Fr Cr, mh
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
