io6 Veterinary Medicine. 



Family TROMBIDIID^. 



Genus : Trodbidium. Red Mite. Harvest Mite. Larvae on 



man and beast. 

 T. Holosericium. Scarlet. Gardens, warm places. 



Europe. Mammals. I^arva in skin. 

 T. Americana. Dull red. Warm places. America. 



Summer. Larva in skin. Man and beast. 



Sub- Family Tetranycid^. 



Genus: Tetranychus (tetrafour, onyx claw). Live on plants 

 and animals. 

 T. Molestissimus (BiCHO Colorado). Attacks mam- 

 mals. Buenos Ayres. 



Sub-Family Cheyletin^. 



Genus : ChEyletus. Soft skin. Maxillary articles have re- 

 curved hooks. 



Ch. ParasiTivorax. Ovoid, grayish yellow, thick 

 rostrum, in fur of rabbits. 



Ch. Heteropalpus (eteros different). Yellow, lozenge 

 shape. Rostrum thin cone. Plumes of pigeons. 



Ch. ErudiTis of old books. Accidentally on animals. 



Genus : Harpirhynchus (arpe sickle). Rostrum short, palpi 

 thick. Second article with three hooks turned up 

 and back. 

 H. Nidulans (nesting). In tumor like clusters on skin 

 of pigeons, etc. 



Genus : SyringophiIvUS. Long wormlike body. Small palpi. 

 In quills. 

 S. Pectinatus. Comb-uke S. Narrow body. An- 

 terior part the broader. Foot with two claws and 

 two bristles. Quills. Chickens, guinea fowl and 

 pigeons. 

 S. Uncinatus. Palpi with larger hooklets. Probably 

 a variety. 



Family SARCOPTID^ (sarx flesh, koptein to cut). 



Minute acari, rostrum an imperfect sucker. Chelicera with 

 two claws. Maxillary palpi with three articles. Hexapod larva. 



Sub-Family Tyroglyphin^ (tyros cheese). Cheese Eaters. 

 S. Detriticola. Live on decomposing organic 

 matter. 



