186 Mr. H. Scott on 



though not identical with tliera in shape. Also, the whole 

 dorsal surface is seen under a high power to be densely 

 covered with microscopic ruga, excepting the five " cephalic 

 areas" on the anterior part of the cephalothorax, which are 

 smooth, contrasting remarkably with the rest of the surface — 

 a contrast which Mliller also noticed in his larvae {op. cit. 

 p. 50). 



Antenna (figs. 3, 4) very short, two-jointed ; basal joint 

 broadening from base to apex ; second joint slightly longer, 

 narrower, of about the same thickness at base and apex, 

 but slightly thicker in the middle. The apex of the 

 second joint is obliquely truncate, and bears a remarkable 

 sense-organ (fig. 4) ; right to one side is a long slightly 

 curved seta, with an erect scale standing at its base ; towards 

 the other side is a group consisting of a transparent, colour- 

 less vesicle (the sharp apex of which appears more strongly 

 chitinized and is pigmented), while round its base is a group 

 of three brown scales, the middle one bluntly lanceolate, 

 the two others slightly longer and with broad dentate 

 apices. 



Being only able to devote a limited time to this work, I 

 have perfoice omitted an examination of the larval mouth- 

 parts. F. Miiller dealt with these organs in detail in his 

 material. 



Cephalothorax. — I follow F. Miiller (op. cit. p. 50) in the 

 naming of the cephalic areas, and have attempted to indicate 

 their outline by means of dotted lines in Fl. IX. fig. 1. 

 The median area (fig. 1, m.a.) is narrow, lanceolate, 

 slightly broader in front, bluntly pointed at either extremity. 

 The intermediate areas (fig. 1, i.e.) form 4-sided figures, 

 narrower in front, with hind margins slightly curved. The 

 lateral areas (fig. 1, l.u.) stretch much further back along 

 the sides of the cephalothorax, their hind margins running 

 obliquely backwards and outwards ; each lateral area is 

 separated from the adjoining intermediate area by a narrow 

 strip of the ordinary rugose chitin, which runs forward from 

 the posterior part of the segment to the base of the antenna 

 {cf. jMilller''s pi. iv. fig. 10). The sutures along the inner 

 and posterior margins of the lateral areas are pale. Each 

 lateral area has on its inner side in front a pale elongate- 

 ovoid mark, under the anterior extremity of which is an 

 ovoid black mass. The pale mark is the transparent cornea, 

 the black mass is a mass of nervous substance which may 

 probably be regarded as an eye ^ (PI. IX. fig. 1, e.) ; the 



* In some of the specimens (preserved in alcohol) the black mass is 

 ■withdrawn from immediately beneath the cornea deeper into the interior 

 of the cephalothorax. 



