ARKIV FÖR ZOOLOGI. 



BAND 7. N:o 12. 



Discomegistus, a iiew genus of myriopodo- 



pliilous Parasitidae from Trinidad, witli 



notes on the Heterozerconinae. 



By 

 IVAR TRÄGÅRDH D. Se, F. E. S. 



With 13 textfigures. 

 Communicated January 25:th 1911 b}^ Chr. Aubivillius and Y. Sjöstedt- 



After Berlese in 1886 [1. p. 206—7 figs. 1, 1 a— c. Pl. 9] 

 described the first acarus found on myriopods, a long time 

 elapsed before the number of myriopodophilous mites in- 

 creased; and it was only 5 years ago that the author [5. p. 

 872—873] was able to add two new genera, Neomegisius små 

 Paramegistus, with one species each, which he had discovered 

 on Spirostrephis sp. in South- Af rica. Considering the num- 

 ber of large JuHdse, which occur in the tropics and which 

 are equally suitable to mites, one could, however, safelypre- 

 sume that these represented only a very small portion of 

 tlie myriopodophilous mites, which further researches would 

 .reveal. 



As a matter of fact, Jacobssons' researches in Java 

 enabled Berlese [3 & 4] to describe, in the last year, not 

 less than 4 new species, for which two new genera and one 

 new subgenus were created. 



And a most remarkable circumstance is that none of 

 these belongs to the family Antennophorince , which contain all 

 the hitherto known myriopodophilous species, but two have 

 their place in the Greeniince, the other two in the Heterozer- 

 conince, the myriopodophilous life being thus acquired inde- 

 pendently in three different families. 



Arkiv för zoologi. Band 7. N:o 12. 1 



