286 BRITISH TYROGLYPHID^E. 



coxae of the second and third legs, and three behind 

 those of the fourth pair. There are also three pairs 

 of hairs on the hind margin. All the above-named 

 hairs are strong and rather stiff, inclined to be spine- 

 like ; they are all clearly, but rather finely, pectinated. 

 Haller appears to have overlooked this, but there 

 cannot be any doubt about it. The bursa copulatrix 

 scarcely projects at all. The legs are thin and rather 

 long ; the two distal joints of the first pair project 

 beyond the points of the mandibles ; the fourth pair, 

 without the caroncles, just pass the posterior end of 

 the abdomen. The tarsi are the longest joints ; par- 

 ticularly those of the fourth pair, which are as long 

 as the other four joints of that leg taken together. 

 The caroncles are similar to those of the male, but 

 longer, narrower, and less developed; they will be 

 described with the male. There are a few fine hairs 

 on the respective joints and the usual clavate curved 

 spine on the anterior tarsi. The vulva is large and 

 placed far forward ; it extends from between the 

 anterior ends of the coxae of the second pair of legs 

 to between the commencement of the coxae of the 

 fourth pair ; it consists externally of two broad, 

 slightly chitinized labia, protected anteriorly by a 

 crescentic sternite. The so-called genital suckers are 

 small and near together. The epimera are strong 

 and rather elaborate ; they will be best understood 

 from the drawings (PI. XVIII, fig. 2, and PL XIX, 

 fig. 12) ; they have a strong thickened edge and 

 mostly a deep blade of thin, and apparently porous 

 chitin, and of a form varying in the respective legs, on 

 the portion of the epimeron nearest to the leg. Those 

 of the first and second pairs are more or less triangular, 

 comparatively narrow, and run more than halfway 

 along the epimera ; the first pair of epimera are joined 

 to the sternite (not the sternum) ; the second are free. 

 The thickened edges of the epimera of the third and 

 fourth legs are joined at their inner ends, and form 

 a curious, undulated, irregular loop ; the blades are 



