. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 164.—Parasitus predator. Leg II of male. (Original.) Parasitids of various kinds occur on the seacoasts, and often have the caronclee modified or enlarged and adapted to the moist soil. Several new genera have been based on such forms as Cyrthydrolaelaps, which is a Cyrtolaelaps, except the peculiar foot. Most of these maritime forms have evidently been developed independently from the adjacent parasitid fauna, and exhibit convergence in structure. Very similar forms are known from the coasts of Eu
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. Fig. 164.—Parasitus predator. Leg II of male. (Original.) Parasitids of various kinds occur on the seacoasts, and often have the caronclee modified or enlarged and adapted to the moist soil. Several new genera have been based on such forms as Cyrthydrolaelaps, which is a Cyrtolaelaps, except the peculiar foot. Most of these maritime forms have evidently been developed independently from the adjacent parasitid fauna, and exhibit convergence in structure. Very similar forms are known from the coasts of Europe and from certain Antarctic islands. The genus Podocinum is remarkable on account of the very long front legs, which the mite uses as feelers. The species occur under sticks on moist ground; one of our species is very common. The species of Paragrccnia (fig. 158) {Greenia Ouds. and Greeniella Bks., both preoccupied) are remarkable for inhabiting a ca\dty in the basal abdomi- nal segment of certain female bees of the genus Koptortho- soma. With them have been found other mites, especially of the genus Trichotarsus. The relation of the mites to the bees is not fully known; the basal segment of these bees is strongly concave and its edges applied closely to the tip of the thorax, thus forming a cavity with an opening above. Within this cavity the Paragreenia occur, often nearly filUng it. These mites have the front legs provided with short retrorse spines; several species have been described, all from the Old World. In the female of an American species of Odynerus a similar cavity is found where the apical margin of the basal segment rests on the front of the nonconstricted part of the segment; a simi- lar but undescribed genus of mites occurs in this cavity. Anystipalpus is in general similar toLaelaps but with the palpus formed on the manner of theTrombidiidae, the last joint forming a "; Of Myrmozercon (including Myrmonyssus) a large number of species have
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