. Smithsonian miscellaneous collections. ureswhich mark these wings externally indicate, according to Hopkins,the points of union between the two layers. The form and generalstructure are shown in figures i, 3, 16 and 27. The elytra when closedand viewed from above are as wide as or slightly narrower than thepronotum, with the sides subparallel, slightly tapering toward the apexand broadly rounded behind, the extreme external margin subacute. 50 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 Basal area.—The basal area (fig. 29), as here interpreted, is thebasal part of the elytra itself and the
. Smithsonian miscellaneous collections. ureswhich mark these wings externally indicate, according to Hopkins,the points of union between the two layers. The form and generalstructure are shown in figures i, 3, 16 and 27. The elytra when closedand viewed from above are as wide as or slightly narrower than thepronotum, with the sides subparallel, slightly tapering toward the apexand broadly rounded behind, the extreme external margin subacute. 50 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 Basal area.—The basal area (fig. 29), as here interpreted, is thebasal part of the elytra itself and the sclerites which form the con-nection with mesonotum and the mesopleura respectively. The articu-latory elements of the elytra itself are made up chiefly of the pro-jected costa (Co) and subcostal veins (Sco) and the costal (a) andthe subcostal heads (b). These heads articulate with the mesopleuralclavicola (fig. 16, d). There are also four distinct axillaries (, axi to aXi) or pteraliae. The first axillary (axi) partly encloses. Fig. 27.—Gnathotrichns refitsus Lee: Left elytron, ventral aspect. An, anal; Cu, cubitus; lilc, media; Ra, radius; Sc, subcosta; IVI, lateral wing lock; a,dorsal or sutural margin; b, costal margin; c, lateral convexity; d, stridulating scraper;e, apex. the tegula and fuses at its a^^ex with the second axillary. The secondaxillary (axo) articulates at its base with the prealar process (a) ofthe prescutum. The apex of the second axillary forms a heavilychitinized clamp in which the elytra fits as a tongue. The thirdaxillary (axs) corresponds to Hopkins flexor plate. It commences onthe internal surface of the second axillary and ends on the externalsurface of the elytra. It is believed that a sclerite (aXi) projectingfrom the posterior margin of the tegula is the fourth axillary. Thetegula (Te) is well developed, having the form of a hairy pad. NO. lO MORPHOLOGY OF GN ATIIOTRICHUS SCIIKDI, 51 Traclieatioti.—All six primary veins (fig. 27) are
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
