120 A. D. MICHAEL ON TWO SPECIES OF ACARINA. 



Pig. 3. — Perfect Creature. — Under side {a b and c) as above. The 

 labium and lingula are seen lying between the mandibles. 1, coxa, 

 Ist pair of legs ; 2, ditto, 2nd pair ; 3, ditto, 3rd pair; 4, ditto, 4th 

 pair, (d) Central apodeme, (e e) Transverse ditto, (//) Lateral 

 i-idges, (f;) Genital plates, (^) Anal ditto. 



Fig. 4. — Mandible. — (a) Penultimate joint, (b) Outer point of ditto, (c) 

 Inner point, (d) Long hair carried by this joint, (e) Moveable 

 ultimate joint. 



Fig. 5. — End of the tarsus and the claw of one of the first pair of legs. 



Fig. 6. — The same part of one of the other legs. 



Fig. 7. — One of the branched hairs. 



Fig. 8. — A portion of the Chitonous dorsal surface, showing the reticu- 

 lation. 



Pygmephorus spinosus. Plate YII. 



Fig. 1. — Adult Male. — (a) Rostrum, {b) Club formed by coalescence of 4th 

 and 5th joints of Ist pair of legs, (c) Single claw of ditto, id) 

 Quadruple claw of 2nd and 3rd legs, (e) Sucker below ditto, (/) 

 Double claw of 4th pair of legs, (g) Stigma. 



Fig. 2. — Female. — The dorsal shield is removed to show structure, (a) 

 Rostrum, (6) Stigma, (c) Air sac, (d) Main trachea starting, with 

 other smaller ones, from centre of air sac, (e) Trachea starting 

 from end of same, (/) Excretory organs. 



Fig. 3. — First Leg of Male. — (a) Coxa, (6) Trochanter, (c) Femur, (d) 

 Coalesced 4th joint and tarsus, (e) Tooth-like projection, (/) 

 Claw, (;/) Pectinated hairs. 



Fig 4. — Mouth organs seen from below. 



