XX 
Fig. 1. 
Fig. 1. 
EXPLANATION OF THE PLATES. 
TAB. XV. 
Oribata centro-americana (pp. 24, 50): 1a, ventral surface; 1 4, lateral view of the 
cephalothorax with pteromorphe; 1c, mandible; 1d, palpus with part of the 
epistomium ; le, tarsus; 1/, eggs. 
. Oribata rugifrons (pp. 25, 50): 2a, ventral surface; 26, mandible; 2c, leg; 
2d, palpus. 
. Larva of Oribata sp. (p. 26): 8a, mandible ; 34, palpus with part of the epistomium ; 
3c, tarsus; 3d, hair. 
. Hoplophora retalteca (ventral view) (pp. 27, 50): 4a, lateral view; 46, mandible ; 
4c, epistomium, with right palpus of the retracted mandibles ; 4d, palpus; 4e, tarsus ; 
4 f, eggs. 
TAB. XVI. 
. Nicoletiella neotropica (pp. 27, 50): la, palpi; 16, microscopical texture of the 
epiderm; 1c, mandible. 
. Uropoda echinata (pp. 28, 51): 2a, hypostome and palpi; 24, tarsus; 2c, micro- 
scopical texture of the epiderm; 2d, chela of the mandible ; 2 e, tarsus of first leg. 
Uropoda inequipunctata (pp. 29,50): 8a, ventral view; 34, chela of the mandible ; 
3c, tarsus ; 3d, anal orifice. 
Celenopsis uropodoides, 2 (pp. 35, 52), ventral view: 4 a, chela of the mandible ; 
4 6, tarsus of first leg; 4¢, genital orifice; 4d, microscopical texture of the skin. 
(See also Tab. XIX. figg. 3-3 0.) 
TAB. XVII. 
. Uropoda centro-americana (pp. 30, 51): 1a, buccal parts in the ventral view, coxe 
of first leg, palpi, corniculi labiales, and labium—the whole protected by the 
anterior margin of the dorsal plate (the mandibles are wanting); 14, tarsus of 
first leg; 1c, tarsus of second leg; 1d, chela of the mandible; le, sternal plate ; 
1 f, spiraculum. 
. Nymph of Uropoda centro-americana (pp. 80, 51): 2a, ventral view ; 20, tarsus. 
. Uropoda piriformis (pp. 31, 51): 3a, ventral view, without the legs; 34, tarsus ; 
3¢, hypostome and palpi; 3 d, chela of the mandible. 
. Uropoda discus (pp. 29, 51): 4a, ventral view of the first pair of legs, palpi, and 
mandibles ; 4, palpus; 4c, tarsus of second leg. 
TAB. XVIII. 
Megisthanus gigantodes, @ (pp. 81, 51): 1a, ventral view; 1, genital orifice ; 
1c, tarsus of second leg ; 1 d, ventral view of the buccal parts. 
. Megisthanus gigantodes, 8 (pp. 31, 51): 2a, ventral view; 26, chela of the mandible 
(deprived of its appendages by maceration in a solution of caustic potash) ; 2 c, ventral 
