Page:Supplement to harvesting ants and trap-door spiders (IA supplementtoharv00mogg).pdf/140

 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 eyes are in two transverse lines, forming an area whose length is rather less than 2-1/2 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 separated from the hind-lateral on its side by not quite half the diameter of the latter, 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 examples 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