THE FAUNA OF SCOTLAND. 71 



11 (10) Whitish-yellow, often entirely brownish-red, or with reddish 



cheeks, the skin smooth, bare, shining; length, 4-5 mm., 



Dryophanta divisa. 



12 (17) Flat, lenticular, circular, often irregular; length, 1-5 to 5 mm. 



Appearing in the autumn ; gregarious. 



13 (14) Almost glabrous, whitish-green to red, a raised knob in the 



centre, the margin turned up, irregular, 



Neu roterus laeviusculus. 



14 (13) Covered with stellate reddish hairs. 



15 (16) Underside without hair, fiat; pale-yellow, seldom red, sides 



not distinctly curled up, Neuroterus (lenticular is) haccarum. 



16 (15) Underside hairy, the sides curled up, red, 



Neu roterus fu mipen u is. 



17 (18) Round, depressed in the centre, covered all over with silky 



brown depressed hair; occurring in numbers on a leaf in 

 August and September, - - Neuroterus numismcitis. 



18 (17) Flat, round, sunk as it were in the leaf, appearing through 



both sides, green ; July, Neuroterus (vesicatrix) immismatis. 



19 (26) Situated on the margin of the leaf, without an inner gall. 



20 (21) Smooth, ovoid, seed-like, greenish-yellow; length, 1-2 mm.; in 



June and July, - - Neuroterus (alhipes) kieviuscidus. 



21 (22) More or less spindle-shaped, or oblong. 



22 (23) Shortly stalked, green, often with red longitudinal lines, the 



apex ending in a point; length, 6-8 mm.; in October, 



A ndricus semincitionis. 



23 (22) Not stalked. 



24 (25) The surface granular, shining, greenish-yellow, often reddish, 



spotted with small pale spots, brownish when old ; length, 

 4 mm. ; in May, - - Dryoplmntci (verrucosus) divisa.. 



