Smithsonian miscellaneous collections . nvaginations of the tergal, pleural, andsternal regions of each segment, and these apodemes are termed theendotergites, the endopleurites, and the endosternites respectively. Thesclerotized tendons and some small invaginations are part of the endo-skeleton but are not considered here. The endotergites (fig. 5 A) are found typically only in the meso-thorax and metathorax. In the prothorax the endotergites are repre-sented only by a rather indefinite group of processes on the hypomerain the region of the coxal cavity and the trochantin. These bear alarge m
Smithsonian miscellaneous collections . nvaginations of the tergal, pleural, andsternal regions of each segment, and these apodemes are termed theendotergites, the endopleurites, and the endosternites respectively. Thesclerotized tendons and some small invaginations are part of the endo-skeleton but are not considered here. The endotergites (fig. 5 A) are found typically only in the meso-thorax and metathorax. In the prothorax the endotergites are repre-sented only by a rather indefinite group of processes on the hypomerain the region of the coxal cavity and the trochantin. These bear alarge muscle disk (fig. 5 A). In the mesothorax the anterior marginof the prescutum is deflexed to form a transverse ridge—the ante-costal ridge or prephragma (prph), which bears a pair of large muscle NO. 13 STAPH YLINIDAE BLACKWELDER 29 disks (rndts) at its ends. There is apparently just behind this smallridge and corresponding with a line or suture on the ectal surface, theprescutal suture (fig. 4 A, pscs), a large transverse phragma ex-. FiG. 5.—Endoskeleton of trunk of Creophilus villosus (Grav.).A, endoskeleton of the dorsum. B, endoskeleton of the venter. tending between the anterior notal wing processes (fig. 4 A, anp), andposteriorly at the sides to the prescutoscutellar suture (pss), andmore or less united to the prephragma. On the midline this phragma 30 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 bears a longitudinal ridge (ppr), and a rounded posterior lobe nextto it on each side (ppl). The ental side of the posterior notal wingprocesses (pnp) of the scutum bears a small transverse phragma ofunknown homology. The endotergites of the metathorax are much more extensive thanthose of the mesothorax. The most conspicuous are the two V-ridges(figs. 4 F, 5 A, vr) converging anteriorly near the center of the seg-ment. These mark the lateral boundaries of the scutellum but are notmarked on the ectal surface by definite sutures. Posteriorly eachV-ridge seems to coalesce with
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