ACAKINA PYGNOGONIDA. 



4'jr, 



Deg., Art/i/x r,'tff.riis, Latr., on Pigeons, occasionally on Man. A. jH- 

 Fiseh. Notorious fur it> bite. 



Fain. Gamasidae. Beetle-mites. Chelicenu clielaU-. Pedipalpi five-jointed. 

 The legs end with t\vo claws and a sucker. Tracheae are present. Some of 

 them lead a free life and are predacious, some are parasitic on Beetles and on 

 the skin of Birds and Mammals. Gamasvs <-i>/r<i/itrti>r>/>n L.. Di-rm>/////xKttx 

 i/riiu/i. Dug., Pt erupt a* r/:tjii'i-t ilituiix Hcrm. 



Fani. Hydrachnidse. Wati.-r-mites. Body globular, often brightly -coloured. 

 ( Ihelicerse usually with a claw-like terminal joint. They have swimming legs, 

 and two or four simple eyes. There arc trachea. The larvse, when hatched, 

 adhere with their large suctorial cone to aquatic Insects, on the blood of which 

 they live. Ili/ttnichntt crucitftt, 0. Fr. Mull. Ata.i- Jionzi Clap., in the mantle 

 cavity of the Dm. * Limnocluires holosericeus~LsAx. 



Fani. Trombidiidae (fig. 388). Body brightly coloured and covered with 

 hairs : the pedipalpus has a claw and a lobe-like appendage. Eyes present. 

 Respiration by tracheae. The hexapodous young live as parasites on Inm <-t 



FIG. 389. Pygnoffonum littorale, 

 (regiie animal) AB, pair of legs 

 used for carryiupf the eggs. 



l-'iu. 388. TrumliJiv.ni 

 cei/in (after Megiiin) . 



and Arachniifa. sometimes on Mammalia, and on Man, in whom they (as L^ptus 

 ai'ti/mnalix) produce a transitory affection of the skin. Tn>ibiiJi>/iii Jwhme- 

 rici'iim L. Ert/tlinru* parhtinus Herm. Tetranychus tek-ariug L. Spinning- 

 mite. 



Fam. Oribatidae. Chelicerse retractile and chelate. Pedipalpus five-jointed, 

 with toothed biting plate on its basal joint. Ocelli absent. Oribatex alatnx 

 Herm.. under moss. 



Fam. Bdellidae. The cephalic region is elongated to form a proboscis, and 

 is distinct from the rest of the body. The chelicerae are chelate. The pedipalpi 

 are Ion" 1 and thin. The animals creep about on damp ground. Iftlrlla lumji- 

 con/ix L. 



PYGNOGONIDA. ;: 



Milne Edwards and Kvoyer placed the Pyijnogonida amon*;- -the 

 Crustacea ; latterly, however, they have been generally placed between 



* A. Dohrn. " Die Pantopoden des Gulfrs vnn Xeapcl und dor iingrenxcnden 

 Mecresabschnitte." Eine Monographic, I.eip/.ig. issl. 



