. Annals. Entomology. 1922] Ewing: Phylogeuy of Gall Mites 221 can actually be traced out not only in other groups of mites, but in the Tetranychidae and the Phytoptipalpidae the two families held to be the most nearly related to the Eriophyidae. Lastly the morphological changes thus traced out are correlated with changes in habits which give finally a high degree of approximation between the hypothetical ancestral group and the group whose origin is to be Fig. 5. A "tree" diagram illustrating the origin and relationships of the families of Prostigmata. The relationship a
. Annals. Entomology. 1922] Ewing: Phylogeuy of Gall Mites 221 can actually be traced out not only in other groups of mites, but in the Tetranychidae and the Phytoptipalpidae the two families held to be the most nearly related to the Eriophyidae. Lastly the morphological changes thus traced out are correlated with changes in habits which give finally a high degree of approximation between the hypothetical ancestral group and the group whose origin is to be Fig. 5. A "tree" diagram illustrating the origin and relationships of the families of Prostigmata. The relationship and origin of the Eriophyidae is indicated in the following diagram (Fig. 5). For sake of completeness the relationships of other families of the order Prostigmata are also shown according to the writer's interpretation. The same relationships can be shown in the form of a key to the families of Prostigmata; not so clearly, yet some practical advantage may be obtained in the key by enabling one to place properly a given species to family. A key to the families of the suborder Prostigmata is here given in the form of a new classifi- cation. In this classification the mouth-parts are made, to a large extent, the basis for family 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 Entomological Society of America. Baltimore [etc. ]
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