210 BRITISH TYROGLYPHIBJ]. 



Texture dull, without polish, like that of the chamois 

 leather of commerce ; usually dotted with minute 

 irregular projections. 



Shape differs in the two sexes, and will therefore be 

 described under the respective headings. 



Male (PL II, figs. 3, 4). Almost diamond- shaped, 

 flattened dorso-ventrally. Cephalothorax almost as 

 long as the abdomen, but sharply divided from it by a 

 transverse sulcation. Rostrum long and narrow, 

 slightly bulbous at the proximal end ; posterior por- 

 tion of the cephalothorax with slightly concave lateral 

 outlines. Mandibles (PL III, fig. 2) somewhat undu- 

 lating in outline both above and below ; the anterior 

 part, forming about one-third of the whole length, is 

 much narrower than the remainder of the organ. The 

 teeth are upon the narrow portion, except the posterior 

 pair, which are situated on the shoulder where the 

 width suddenly increases. The teeth are curved, and 

 are of about uniform size, except the two anterior and 

 the two posterior, which are larger than the others ; 

 the anterior tooth is terminal. Palpi with two flagella 

 of about equal length, which is slightly greater than 

 that of the free portion of the palpus. These flagella 

 are almost stiff and straight, but slightly hooked at the 

 distal ends. Membranous expansions of the palpi bi- 

 lobed, much wider than the palpi ; they continue on 

 along the anterior end of the maxillary lip, and join in 

 the median line, forming a funnel down which the 

 liquid nourishment passes. There are two small 

 pointed tubercles on the dorsal surface of the distal 

 joint of the palpus just before the insertion of the 

 dorsal flagellum. The legs are shortish, the fourth 

 pair set far back, and from this cause and the short- 

 ness of the abdomen the whole tarsus of the fourth leg 

 passes the posterior margin of the abdomen. The two 

 anterior pairs of legs are thicker than the posterior, 

 but both are stout. They bear several short conical 

 spines, the positions of which may be seen from PL III, 

 figs. 3 6, and a few fine short hairs. The tactile hair 



