. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERLOCKING MECHANISMS IN COLEOPTERA. 291 2. By means of a groove on the dorsal face of the metathorax into which the swollen inner edges of the elytra fit. 3. By slipping the anterior edges of the elytra under the scutel- lum and hooking them (a) on to the scutellum, or (/;) on to the metathorax. Pressure derived from the retracted prothorax may aid in keeping these edges in position. 4. By hooking the anterior lateral edges of the elytra over ridges or into grooves on the lateral faces of the metathorax. (a) Interlocking
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. INTERLOCKING MECHANISMS IN COLEOPTERA. 291 2. By means of a groove on the dorsal face of the metathorax into which the swollen inner edges of the elytra fit. 3. By slipping the anterior edges of the elytra under the scutel- lum and hooking them (a) on to the scutellum, or (/;) on to the metathorax. Pressure derived from the retracted prothorax may aid in keeping these edges in position. 4. By hooking the anterior lateral edges of the elytra over ridges or into grooves on the lateral faces of the metathorax. (a) Interlocking Mechanisms found in Lachnostcrna. LacJinosterna fusca is one of the lamellicorn beetles. The head, prothorax and elytra show in dorsal view, together forming a broad oval outline. The elytra almost cover the abdomen, the exposed part being curved downward in such a way that it cannot be seen from above. The abdomen is shortened and rounded, and the elytra curve sharply downward at the sides and posteriorly. The first three of the methods of interlocking mentioned above are used in LacJinosterna. The hooking mechanism of the fourth method is present, but is not Fig. I. Mid-dorsal portion of the cross section of the elytra and metathorax of Lachnostertia, showing the adaptation of the elytra to each other along the dorsal suture and to the metathoracic groove. X 75- I. The method of joining along the dorsal suture is shown in Fig. I, which represents a cross section of the mid-dorsal region of the elytra. In this case the elytra are nearly as they would be when the elytra were firmly closed, and are partially slipped into. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952;
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