. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. JACOT: AMERICAN ORIBATID MITES on anterior border, and Neoribates-Galumna whose lamellae have be- come reduced to appressed plates, barely to not at all projecting from surface of cephaloprothorax. Their pteromorphae, however, show two stages of development. In Xeorihatcs they are sinuous along ventral edge and have no median groove, while in Zetes-Gahnnna they ai"e dis- tinctly emarginate and have the groo^•e (a structure which undoubt- edly gives greater flexibility). A further development would be the division
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. JACOT: AMERICAN ORIBATID MITES on anterior border, and Neoribates-Galumna whose lamellae have be- come reduced to appressed plates, barely to not at all projecting from surface of cephaloprothorax. Their pteromorphae, however, show two stages of development. In Xeorihatcs they are sinuous along ventral edge and have no median groove, while in Zetes-Gahnnna they ai"e dis- tinctly emarginate and have the groo^•e (a structure which undoubt- edly gives greater flexibility). A further development would be the division of the pteromorphae into two along this groove — if of ad- vantage to the animal. The other genera ha\'e been sufficiently dis- cussed. The following diagram will make this relation clearer:. Neoribatea Protokalmnma To facilitate the placing of species in these groups, the following key will be found useful: 1. Lamellae a narrow projecting blade 2 1. Lamellae closely appressed to cephaloprothorax for most of its extent 3 2. Pteromorphae, if not convex in outline both anteriorly and ventrally, only slightly sinuous along ventral edge Protokalumma 2. Pteromorphae with anterior or antero-ventral edge distinctly emarginate and more or less pointed Parakalumtna 3. Pteromorphae with ventral edge sinuously convex Neorihates 3. Pteromorphae with ventral edge distinctly emarginate 4 4. Abdomino-cephaloprothoracic suture distinct and entire 5 4. Abdomino-cephaloprothoracic suture lacking or partially lacking or in- distinct .... 6 5. Pteromorphae attached along the sides Zetes 5. Pteromorphae, at least anteriorly, attached on dorslim (teste Oudemans) Satidenia. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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