50 



Acarology 



-. 1946. Outline of a new classification of the Mesostigmata (Acarina) 

 based on comparative morphological data. Lunds Universitets Ars- 

 skrift. 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. 



MICROGYNIINA TRAGARDH, 1942 



Figure 38 Microgynium rectangii- 

 latiim Tragardh, 1942. Ventral view 

 of female. (After Tragardh 1942) 



This group was recognized as a 

 cohort by Tragardh and was erected 

 to contain two new species found by 

 Forsslund in Sweden. Each species 

 was recognized by Tragardh as rep- 

 resenting a new genus and family. 

 The sub-order is characterized by 

 Tragardh as follows: the male genital 

 aperture is located in the sternal 

 shield and is not ring-shaped; the 

 plate is not segmented and is di- 

 rected forwards. The female genital 

 aperture is a small transverse fissure 

 placed far back without any connec- 

 tion with either the sternal or ventral 

 plates. Three or four dorsal shields 

 are present. The peritreme is short 

 and tarsus i lacks a peduncle. 



Key to the Microgyniina 



1. Dorsal side with three plates; ventral plate of female divided 

 longitudinally Microgyniidae 



Dorsal side with four plates; ventral plate of female entire 



Microsejidae 



Microgyniidae Tragardh, 1942 



Figure 38 



Diagnosis: Microgyniids are small (0.3-0.4 mm.), colorless to fight 

 yellowish brown mites with three dorsal plates and a divided ventral 

 plate in the female. 



