Mesostigmata 



103 



Genera: 



1. Diarthrophallus Tr'igkrdh, 1946 



Type. U rose jus querciis Pearse and Wharton, 1936 



2. Brachytremella Tragardh, 1946 



Type. Brachytremella spinosa Tragardh, 1946 



3. Passalobia Lombardini, 1926 



Type. Passalobia quadricaudata Lombardini, 1926 



Figure 75 Diarthrophallus quercus (Pearse and Wharton), 1936. Ventral 

 plates of male (left) and female (right). (After Tragardh 1946) 



Discussion: Diarthrophallids are similar to the uropodids in general 

 appearance. However, as Tragardh 1946 points out they are amply 

 distinct. All members of the family are found on beetles of the family 

 Passalidae. They have been found in South America, North America, 

 Central America, and New Guinea. 



D. quercus Pearse and Wharton, 1936, is common on passalid 

 beetles in the vicinity of Durham, North Carolina. 



Reference: 



Tragardh, I. 1946. Diarthrophallina, a new group of Mesostigmata, found 

 on passalid beetles. Entom. Medd. 24:370-394. 



