MANUAL OF NATURAL HISTORY. 277 



cheliforrn ; eyes none ; legs for walking, tarsi 

 ending in a vesicle. 



2. FAMILY. Garden -Mites (Trombiidse). Palpi 

 pointed, with a moveable appendage below 

 the tip; feet formed for walking; eyes latero- 

 anterior; chelicergp ending in a moveable 

 claw. 



3 FAMILY. Spider-Mites (Gamasidse). Palpi fili- 

 form, incurved, short, free ; mouth with two 

 didactyle chelicerse ; body depressed, skin 

 soft or scaly ; legs formed for walking, tarsi 

 unguiculate. 



4. FAMILY. Wood-Mites (Orbitidse). Palpi fusi- 



form, hid under the head, without hooks ; 

 mouth with didactyle chelicerse ; eyes not 

 distinct ; body hairy or scaly, produced and 

 rostrate in front ; legs formed for walking. 



II. SUB-ORDER. TICKS (Suctoria). 



Mouth in form of a sucker, with or without palpi ; 

 no apparent mandibles. Animal attached. 



5. FAMILY. True-Ticks (Ixodidae). Palpi valvi- 



form, enclosing the sucker ; mandibles 3- 

 jointed, the last joint scale-like and denticu- 

 late ; chelicerse none ; eyes none ; legs formed 

 for walking. 



6. FAMILY. Plant-Ticks (Bdellidse). Palpi antenni- 



form ; mandibles unguiculate or cheliform ; 

 eyes distinct ; sucker in form of elongated 

 beak ; body with a corselet ; legs formed for 

 walking. 



