Smithsonian miscellaneous collections . imal part (in) bears a pairof short but very wide lateral apodemes (D, E, Apa). The endophal-lus is relatively small, but the anterior apodemes (iv) of its lateralplates are large and widely divergent (E). Schistocerca amcricana (Drury).—-The elongate subgenital plate ofthe ninth abdominal sternum of this species has a broad, deeply emargi- NO. 6 GRASSHOPPER ABDOMEN SNODGRASS iiate extension projecting far beyond the origin of the palhum from itsdorsal lamella (fig. 35 A, B, IXSL). The exposed part of the pallium(Pal) forms a thick, transversely corrugat
Smithsonian miscellaneous collections . imal part (in) bears a pairof short but very wide lateral apodemes (D, E, Apa). The endophal-lus is relatively small, but the anterior apodemes (iv) of its lateralplates are large and widely divergent (E). Schistocerca amcricana (Drury).—-The elongate subgenital plate ofthe ninth abdominal sternum of this species has a broad, deeply emargi- NO. 6 GRASSHOPPER ABDOMEN SNODGRASS iiate extension projecting far beyond the origin of the palhum from itsdorsal lamella (fig. 35 A, B, IXSL). The exposed part of the pallium(Pal) forms a thick, transversely corrugated fold against the para-procts. When the tenth and eleventh segments are removed (B) thegenital chamber is exposed from above, and there are to be seen onits floor the phallic structures lying anterior to the aedeagus, the latterbeing still concealed beneath the pallial hood. The epiphallus consistsof large lateral lobes (h, h) connected by a narrow median bridge;anterior processes are absent, but the posterior processes are present. Fig. 35.—Male genitalia of Schlsfoccrca amcricana (Cyrtacanthacrinae). A, end of abdomen. B, dorsal view of genital lobe of ninth sternum, pallium,and anterior part of genital chamber, exposed by removal of tenth and eleventhsegments. C, phallic organs, posterior view. D, same, lateral view. E, aedeaguswith apodeme, endophallus, and ejaculatory sac. F, endophallus and apex ofaedeagus. in the form of large triangular plates {k, k). Between the bases ofthe latter the floor of the genital chamber presents a deep transversegroove, the part behind the groove terminating in the basal fold {hf).The aedeagus is small (C, D, Aed), but its ventral lobe {vl) is rela-tively large. The principal part of the dorsal lobe is formed of theusual proximal subdivision (D, E, m), the distal part (E, r) beingmuch reduced and ending in a small spoutlike terminal lobe withoutapical processes. The aedeagal apodemes (E, Apa) are short butbroad at their bases. The endop
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
