52 

 Genus: 



Acarology 



M/cravf/7/5 Tragardh, 1942 



Type. Microsejus truncicola Tragardh, 1942 



Discussion: These mites are found under the loose bark of tree 

 stumps. Only nymphs and adults are known. They are of no known 

 economic or medical importance. 



References: 



Tragardh, I. 1942. Microgyniina, a new group of Mesostigmata. Ento- 

 mologisk Tidskrift Arg. 63. Haft. 3-4:120-133. 



. 1943. Further contributions towards the comparative morphology 



of the Mesostigmata (Acarina) the Antennophoridae and the Megis- 

 thanidae. Arkiv. for Zoologi. 34A. N:o 20:1-10. 



. 1946. Outlines of a new classification of the Mesostigmata (Aca- 

 rina) based on comparative Morphological data. Lunds Universitets 

 Arsskrift. N.F. Avd. 2. 42: No. 4:1-37. 



. 1946. Contributions towards the comparative morphology of the 



Mesostigmata (Acarina) VII. The praesternal hairs and the male 

 genital aperture. Sartryk ur Entomologsk Tidskrift. Arg. 67. Haft. 

 3:88-108. 



GAMASIDES LEACH, 1815 



Gamasid mites are among the commonest type found in most col- 

 lections, whether from debris or as ectoparasites of vertebrates or 



invertebrates. Since the monu- 

 mental works of Berlese, no au- 

 thor has achieved a really clear 

 understanding of this vast assem- 

 blage of species. The classifica- 

 tion of the group that follows is 

 largely taken from Vitzthum 

 1941. 



Of special value in the classifi- 

 cation of these mites is a forked 

 Figure 40 The specialized setae on seta at the base of the palpal 

 the palpal tarsus of a laelaptid (left) tarsus (Figure 40). Those species 

 and non-laelaptid (right) mite. The ^j^^^ ^^^^ ^^^^ ^^^^ ^^^ ^^^^^ ^^ 

 other setae on the palpal tarsus have ,-, i i i • 



been omitted. ' the seta can readily be placed mto 



