1897 ] 57 



margin of their respective segments, as minute free lobes. These lobes 

 can be seen with a fairly powerful lens, and are obvious with the aid 

 of a microscope. 



In a later stage the inner margin of the basal half of the wing- 

 pads is still firmly attached to the whole length of the side of the now 

 obviously triangular nota ; but their line of union is now marked by 

 deep grooves, whereas in the earlier stage the triangular shape was 

 only apparent by indistinct darker lines on the pale ground-colour, 

 and very faint and indistinct impressed lines. The free apical lobes 

 have now greatly increased in size, and are equal in length to that of 

 the nota, of which they are outgrow'ths, so that the front wing-pads 

 now extend as far back as the middle of the hinder pair, or about as 

 far back as the base of the metanotum. Hairy themselves and with 

 fringed margins, each bears a red-brown longitudinal line near its 

 outer margin — probably the large radial vein of the mature insect, in 

 which this vein is itself bordered on each side with reddish colour. 

 The part of the wing-pads attached to the nota {i. e , the basal portion) 

 is still more chitinous than the free apical jmrts, which are somewhat 

 thick and swollen. Two individuals, however, agreeing in all other 

 respects, had the w'ing-pads more of the texture of the adult, so it is 

 not improbable that this condition may have been attained by another 

 moult. 



In the adult the wings are again greatly increased in length, and 

 have become thin, soft and flimsy. The meso- and metanota form two 

 triangular pieces, one behind the other. The main attachment of the 

 wings is at the anterior angles, but along the whole length of the sides 

 of the nota is a thin fringe, arising from the base of wings, and ob- 

 viously a part of them. This fringe is now the only trace of the 

 firm connection of the inner margin of the bases of the wing with 

 the whole sides of the nota, as exhibited in the earlier stages. 



The female has no such complicated structure of the nota, but 

 they remain through life in much the same condition as in the young 

 of either sex. The abdomen of the female is cylindrical and com- 

 paratively stout, that of the male flattened and depressed. Apart 

 from the very different structure of the notal sclerites, and the absence 

 of wings, the female has comparatively less developed eyes, and the 

 joints of the antennae moniliform— decidedly less elongated than those 

 of the male. 



In the Cambridge Natural History ("Insects," Part 1, p. 351) a 

 reproduced figure is given of Oligotoma Miehaeli, McLach., which, but 

 for the presence of wings, agrees pretty well in general form with the 



