90 Acarology 



Discussion: Members of the Phytoseiidae are frequently found on 

 plants where they are extremely beneficial because they are predaceous 

 and help to keep the species that feed on plants in check. Garman 

 1948 points out that pesticides that affect this group of mites may be 

 harmful if applied to plants because they will allow the plant feeders to 

 go unchecked, Garman also discusses the classification of these mites, 

 but many of his conclusions are not followed here. 



References: 



Garman, P. 1948. Mite species from apple trees in Connecticut. Conn. 

 Agr. Expt. Sta. Bull. 520:1-27. 



Hughes, A. M. 1948. The mites associated with stored food products. Min- 

 istry of Agriculture and Fisheries, London, pp. 1-168. 



Keegan, H. L. 1944. On a new genus and species of parasitid mite. J. Para- 

 sitol. 30:181-183. 



Lord, F. T. 1949. The influence of spray programs on the fauna of apple 

 orchards in Nova Scotia. IIL Mites and their predators. Canad. Ent. 

 81 (8):202-214. 



Iphiopsidae Kramer, 1886 

 Figure 66 



Diagnosis: The most useful 

 characteristic in identifying iphi- 

 opsids is the minute peritreme. 

 All legs have pretarsi and carun- 

 cles. The specialized seta on the 

 palpal tarsus has two tines. The 

 epigynial plate may be drop- 

 shaped or excavated posteriorly. 



Figure 66 Jacobsonia tertia Vitzthum. 

 193 L Ventral view of female. (After 

 Vitzthum 1931) 



