go THE SCOTTISH NATURALIST 



with the Malpighian vessel showing a greenish yellow. The 

 legs are more or less transparent. The capitulum has its lower 

 edge deeply concave, and the processes at its extremities are 

 sharply tapered, and, being short, do not extend beyond the 

 pharynx. The anterior processes are as usual longer, but they do 

 not reach back to the level of the posterior end of the pharynx. 

 At its posterior end the pharynx is very thick and broad, but 

 it narrows rapidly till the width is reduced to one-third. The 

 anterior third when viewed laterally is seen to be fairly curved. 



The palpi are as usual characteristic. The extensor surface 

 of the second segment is highly arched, appearing, when viewed 

 laterally, to be almost angular. It has two spines close together 

 at its distal extremity, and two or three smaller ones farther back. 

 The bristle on the flexor surface stands back from the distal 

 margin, and is fairly long and slender. The distmctive feature 

 of the third segment is six long bristles on the inner surface. 

 Three of these are distal, one being at the flexor edge, one at 

 the extensor edge, and the third rather closer to it than to the 

 first. The fourth bristle is on the edge of the extensor surface, 

 about midway between the proximal and distal extremities of 

 the segment. The fifth lies slightly posterior to the fourth, but 

 more in towards the centre of the inner surface. The sixth lies 

 immediately posterior to the fifth, and about midway between it 

 and the proximal extremity of the segment. The hair at the 

 posterior pore on the flexor surface is very prominent, but the 

 anterior pore hair is very indistinct. The hairs on the extensor 

 surface are clustered distally, one being longer and more curved 

 than the others. The second, third, and fourth segments are 

 entirely porose, and very distinctly so. 



The posterior ends of the first pair of epimera lie nearer to the 

 genital area than to the capitulum. The posterior ends of the 

 second pair are broad and thick. The posterior margin of the 

 fourth pair is variable, so that the epimera are to be found with 

 three or four edges. The lateral emargination is weak, and the 

 inner posterior corners are blunted. 



The legs are slender, with no appreciable enlargement of the 

 sixth segment. At the distal end of the fourth and fifth segments 

 of the third and fourth pair of legs, there will be observed a single 

 hair— possibly a rudiment of the rows of swimming hairs to be 

 found in other species. The claws are small, without accessory 

 claw and lamina. 



As in other nymphs, the palpi of the nymph of Z. a/iou/afa 

 differ considerably from that of the imago. The first segment 



