Smithsonian miscellaneous collections . y, 168) by thefact that it lies external to the internal lateral muscles {175, 176).It has the same relations in some other insects, though it is a musclenot generally present. In Dissosteira it is repeated in the segments //to VII of both sexes, and in segment VIII of the male (fig. 12, 244).The paradorsal muscle has been termed a pleural muscle, but itlies well within the area of the dorsum. Since it occurs in some larvalinsects lacking tergal plates, the writer here discards the former nameof paratergal muscle. (Snodgrass, 1931.) NO. 6 GRASSHOPPER ABD
Smithsonian miscellaneous collections . y, 168) by thefact that it lies external to the internal lateral muscles {175, 176).It has the same relations in some other insects, though it is a musclenot generally present. In Dissosteira it is repeated in the segments //to VII of both sexes, and in segment VIII of the male (fig. 12, 244).The paradorsal muscle has been termed a pleural muscle, but itlies well within the area of the dorsum. Since it occurs in some larvalinsects lacking tergal plates, the writer here discards the former nameof paratergal muscle. (Snodgrass, 1931.) NO. 6 GRASSHOPPER ABDOMEN SNODGRASS 21 ijo, iji. External dorsal muscles (fig. loA).—External dorsalmuscles occur in segments // to VII of both sexes, and also in seg-ment VIII of the male. They take their origins on the posterior partsof the terga within the intersegmental folds, and are inserted on theoverlapped anterior margin of the tergum following in each case. Themedian external dorsal of segment /// (figs. lo A, ii B, 770) arises 167b-. 167c 167d. Fig. 10.—Muscles of the third abdominal segment of Dissosteira Carolina. A, muscles of the right side, inner view. 16/, median internal dorsals; 16S,lateral internal dorsal; 169, paradorsal muscle; i/O, median external dorsal;17T, lateral external dorsal; 17^, median internal ventral; 173, lateral internalventral; 174, external ventral; 175, 176, internal laterals; 177. 178, 179, externallaterals; td, attachment of dorsal transverse (diaphragm) muscles. B, position of the muscles in cross-section of third segment, , lateral internal dorsals; dim, median internal dorsals ; DS, dorsal sinus;DV, dorsal blood vessel; lAp, lateral apodeme of sternum; ilc, first ex-ternal lateral muscle; //, internal lateral muscle; />. paradorsal muscle; PvS,perivisceral sinus; td, dorsal transverse muscles (of dorsal diaphragm); tv. •ventral transverse muscles (of ventral diaphragm) ; vil, lateral internal ventralmuscle; vim, median internal v
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
