Two New Species of Tetranychus (Acari: Tetranychidae) Infesting Corn in Inner Mongolia, China.

Tetranychus huhhotensis n. sp. and T. zeae n. sp. are described and illustrated from corn leaves in Inner Mongolia. Tetranychus huhhotensis n. sp., assigned to Flechtmann and Knihinicki's Group 4 of Tetranychus, can be separated from its allied species by having the aedeagal knob with dorsal surface distinctly emarginate centrally. Tetranychus zeae n. sp. is distinctive in Group 9 of this genus in that the aedeagal knob is minute, with anterior projection practically absent and posterior projection conspicuous, acute. Summer females of the two new species are pale greenish-yellow, while their diapausing females are pale-orange. [ABSTRACT FROM AUTHOR]