File:Gnathotrichus materiarius anatomy - Smithsonian miscellaneous collections (1931) (14597829398).jpg

Identifier: smithsonianmisce821931sm (find matches)
Title: Smithsonian miscellaneous collections
Year: 1862 (1860s)
Authors: Smithsonian Institution
Subjects: Science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Scolytidac showing the setalarrangement was found in the monograph of the genus Dendroc-toniis by Hopkins (38). It seems that Hopkins, who has usuallyoverlooked the setae of the larva, did not realize the origin of thesetae of the pupa, which he called spines. Russo, on the other hand,shows plainly the setae of the larva but has ignored those of thepupa. In fact, it is a difficult undertaking to study the setae of suchsmall larvae or pupae. In Gnathotriclnts. it is not possible to find thesetae by working with a binocular but slides had to be made and thosecarefully examined under the microscope. The following discus-sion is illustrated by figure 40. The setae are only barely visiblesoon after the last molting of the larva. In the young pupa they aremost distinct before the pupa starts to become the mature color, andthey disappear gradually with the ripening of the adult. SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 ^ i-i c\3 to o- in (D t^ (O -i= K I- h- I- I- h- l-h- ;: - ^ c 3 1)
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I 11 1 K -^^^ i I 1 r*— -tol 1 1 cu I CI (D C i L cn 1 03 £1- h- I- i-t-i-i-i- NO. 10 MORPHOLOGY OF GNATIIOTRICHUS SCHEDL 83 THE HEAD The elements of the adult and larval head are also recognizable inthe pupa. The antennae are among the first parts to be fully developed.The mandibles, the maxilla and the labium are first indicated by lowelevations which become gradually the shape of the correspondingelements in the adult stage. A lobe, situated dorsally of each mandi-ble (Ep) is more distinct in the younger pupa and gradually dis-appears. It is apparently the reduced labrum and clypeus. A similardevelopment takes place with the frontal groove which is a distinctwide groove at first and later on becomes reduced to the narrow simplesutura fronto-verticale. The larval setae of the head are all com-pletely lost in the pupa. THE THORAX Prothorax.—The shape and the relative proportions of the pro-thorax resemble very much that of the adult. The sternum and theextreme anterior margin of

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