266 SPECIFIC DESCRIPTIONS OF 



exact form and distribution of the central band and 

 these tapering bars, as their differences from the 

 character of the similar part in another closely allied 

 species are strongly specific ; the above description 

 holds good in above twenty examples before me. 



The ei/es are in two transverse lines, forming an 

 area whose length is rather less than 2J times its 

 width ; the foremost line is curved, and the curve 

 directed backwards, the hinder one is also curved and in 

 a similar direction, but less strongly, looking laterally 

 the extreme margin of the four eyes of the hinder row 

 forms a straight line. Considered as in pairs, those of 

 the fore-central pair are separated by an interval equal 

 to that which separates each from the fore-lateral and 

 hind-central nearest to it ; the fore -laterals are divided 

 by about two and a half diameters ; they are the largest 

 of the eight, only slightly however, in some examples, 

 larger than the hind-laterals. Each of them is sepa- 

 rated from the hind-lateral on its side by not quite 

 half the diameter of the lalter, and each hind-lateral 

 is very nearly but not quite contiguous to the hind- 

 central on its side ; the hind-centrals are roughly 

 rounded, smallest of the eight, though in some examj)les 

 equal in size to the fore-centrals, and are separated 

 from the fore-central nearest to it by about one 

 diameter, which gives a clue to the absolute distance 

 between the eyes of the foremost pair. The four 

 lateral eyes are oval, the fore- centrals round; those 

 of the foremost row are darkish coloured, while those 

 of the hinder row are pearly white. 



Although it is of great importance to observe as 

 accurately as possible the relative position and size of 



