ENTOMOLOGICAL NEWS 11 Ten New Species of Phytoseius (Pennaseius) from Mexico, Trinidad, and British Guiana with a Key to Species (Acarina: Phytoseiidae) ' DONALD DE LEON, Ervvin, Tennessee The species considered in this paper belong to the sub-genus Pennaseius Pritchard and Baker, 1962. Schuster and Pritchard ( 1963) raised the group to generic rank, but this ranking doesn't seem warranted to me. These mites are whitish, not very fast moving, and are commonly found on leaves of trees and shrubs. Although they are considered to be predacious, I have never observed them feeding, but have occasionally taken them from plants on which I saw no other mites. They may be facultative predators because Chant (1959) shows that some species in other genera of the family feed not only on other mites, but also on pollen, fungi, and plant juices. In the descriptions, I have followed Carman (1948) in the designation of setae as his system seems less cumbersome for the phytoseiids than more recent proposals. In several of the new species, some or all of the shields of the ventral surfaces of the specimens at hand are so indistinct drawings could not be made. The descriptions and drawings are of holotype females except for the spermatodactyls which are of paratype males. All meas-urements are in microns. Leg measurements are from base of coxa to claw-end of pretarsus; tarsal measurements include the pretarsus. KEY TO SPECIES OF SUB-GENUS Pennaseius (Females except for florid-anus Muma) 1. Dorsal shield with a pore close to base of Ml 2 Dorsal shield without a pore close to base of Ml 15 2. Genu IV without a greatly differentiated seta (Figs. 1-6) . .3 Genu IV with a greatly differentiated seta (Figs. 7-10) . . .9 3. L4 much shorter than L3 (about | as long or less) 4 L4 about as long as or longer than L3 8 1 Cost of engravings paid for by a grant from the Pinellas Foundation. St. Petersburg, Florida.