1917] Synopsis of Beetle Mites 125 



cc. When leaf-like, or fan-like setae present, they are confined to the abdomen. 

 d. Tarsi very long, slender; legs and cephalothorax clothed with simple 



setag Heterochthonius^" Berlese, 1910 



[Type: H. gibhus Berlese] 

 dd. Tarsi short, stout; legs and cephalothorax clothed with pectinate 



setae Cosmochthonius Berlese, 1910 



[Type: C. lanatus (Michael)] 



Subfamily Trizetince has but one Genus Trizetes Berlese, 1904 



[Type: T. pyramidalis Berlese] 



Family Hoplodermatid/e. 



Key to the Genera of Subfamily Protoplophorince. 



a. Claws of tarsi monodactyle Protoplophora Berlese, 1910 



[Type: P. palpalis Berlese] 

 a. Claws of tarsi bidactyle, heterodactyle, and of enormous length, 



Arthroplophora Berlese, 1910 

 [Type: A . paradoxa ^Qvlese] 



Subfamily Mesoplophorina has but one Genus Mesoplophora Berlese, 1904 



[Type: M. michaeliana Berlese] 



Key to the Genera of Subfamily Ho ploder matinee. 



a. Ungues monodactyle; anal and genital covers separate. 

 b. Cephalothorax with a median, dorsal carina. 



c. Abdomen with a hood-like projection extending forward from its anterior 



margin Steganacarus n. gen. 



[Type: Hoplophora anomala Berlese] 

 cc. Abdomen without hood-like projection extending forward from its 

 anterior margin. 

 d. Abdomen as well as cephalothorax with a median carina above, 



Tropacarus n. gen. 



[Type: Hoplophora carinatum Koch] 



dd. Abdomen without dorsal, median carina. . .Hoploderma'-' Michael, 1898 



[Type: H. magna (Nicolet)] 

 bb. Cephalothorax without a median carina above. 



c. Integument rough, pitted, or sculptured Atropacarus n. gen. 



[Type: Hoplophora stricula Koch] 

 cc. Integument smooth, without pits or sculptures. . . . Ginglymacarus n. gen. 



[Type: G. dasypus (Duges)] 

 aa. Ungues tridactyle; anal and genital covers fused. 



b. Integument rough, pitted, or sculptured Euphthiracarus n. gen. 



[Type: E.flavus (Ewing)] 

 bb. Integument smooth, not pitted or .sculptured. . . . Phthiracarus-^ Perty, 1841 



[Type: Hoplophora ardua-^ Koch] 



2°Although given by Berlese as a subgenus, I hold that the characters are 

 good generic ones. 



^^Name suggested by Michael to replace Hoplophora, which was found to be 

 preoccupied. 



2-= rn7ta Berlese. 



-^Michael claims that Koch's Hoplophora deciimana is only a synonym of 

 Hoploderma dasypus Duges, hence is not included in Phthiracarus. I suggest 

 Hoplophora ardua Koch as the type of Phthiracarus. 



