. Smithsonian miscellaneous collections. ts extremities the ventral articulations (figs. 6, 7 b) of themandibles. From the oral aspect it is visible; from the ventral, it ishidden by the pregula and the gena. Other regions, such as the pregena (Hopkins), etc., are not at alldistinct or limited and are therefore of no interest in this discussion. THE APPENDAGES OF THE HEAD THE ANTENNAE The antennae present good generic characters; the species modifica-tions are less important. The sexual differences are distinct also. Allthe longer setae of the antennae are feathered. * The hypostoma, as the te
. Smithsonian miscellaneous collections. ts extremities the ventral articulations (figs. 6, 7 b) of themandibles. From the oral aspect it is visible; from the ventral, it ishidden by the pregula and the gena. Other regions, such as the pregena (Hopkins), etc., are not at alldistinct or limited and are therefore of no interest in this discussion. THE APPENDAGES OF THE HEAD THE ANTENNAE The antennae present good generic characters; the species modifica-tions are less important. The sexual differences are distinct also. Allthe longer setae of the antennae are feathered. * The hypostoma, as the term is used here, or the ventral angles of the postgena,is the bearer of the maxillare and not the labium. A submentum, as this termwas used by Hopkins in Dendroctonus, is not defined by sutures. NO. 10 MORPHOLOGY OF GNATHOTRICHUS SCHEDL 23 The scape (fig. 8, A, S) is slender and clavate toward the aj> and punctures are rather sparse. The scape is about as longas the funicle and the club together. The funicle (fig. 8, A, F) is. Fig. 8, A.—Gnathotrichns retusnsLee, adult female: Antenna, interno-lateral aspect. C, antennal club; F, funicle; S, scape; p,pedicle; 2, 3, 4, 5, joint of the funicle; i, 2,3, joints of the club. Fig. 8, B.—Gnathotrichns retiisusLee, adult female: Antenna, externo-lateral aspect.
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