Preface vii 



were drawn from specimens mounted in balsam, using a monocular 

 microscope, any errors of interpretation due to tlie transparency of the 

 chitin in the mounted specimen being corrected by reference to the 

 opaque object. We lay great stress on the avoidance of errors due to 

 the examination of mounted specimens ; figures of ticks drawn from 

 such specimens are exceedingly misleading. Where a figure is re- 

 produced from a freehand drawing, it is referred to as a "sketch " in the 

 accompanying legend. We attach much importance to the illustration 

 of the main structural characters in conjunction with the descriptions, 

 for they convey a much more accurate and rapid impression to the 

 mind than any amount of description. There are certain structures 

 which should be figured in nearly all instances, and we have included 

 them in most of our illustrations. 



The Part contains 202 text-figures (several being marked A and B) 

 and 14 figures comprised in four plates, the total number of figures 

 being 216. 



Text-Figures. 



Of the 94 new figures 84 were drawn by G. H. F. Nuttall^ 

 6 „ „ F. M. Howlett I t 



3 ,, ,, C. Warburton [ 



1 was drawn by L. E. Robinson J 



Of the 107 previously 1 



.,.,,„ 1-48 are from publications by Neumann 



published ngures) 



32 ,, ,, Nuttall and Warburton, jointly, 



or as separate authors 



4 ,, ,, Wheler 



2 ,, ,, Salmon and Stiles 

 1 is from a publication by Evans 



1 ,, ,, Lewis 



2 are from publications by Nuttall, Cooper and Robinson, 



and Nuttall and Merriman 

 18 are reprinted from Parts I and II to illustrate matters 

 treated of in the appendices 

 202 



Plate-Figures. 



Of the 4 new ngures 2 are from photographs by E. G. Wheler 

 2 ,, ,, L. E. Robinson 



The 10 published figures are all from Wheler 



14 



* We have made it a rule to consult together about most of our figures, with a view to 

 ensuring their accuracy. 



