74 THE FAUNA OF SCOTLAND. 



56 (56) Not ending in a nipple-like point, - Amlricus aiitumnilis, 



57 (58) The apex of a terminal twig inflated, the inflation longer 



than broad, the cavity large, and containing the small 

 inner gall ; in May, June, and July, 



Andricus injlator and A. curvator. 



58 (59) The twigs or the midribs inhabited by the larvae, which cause 



irregular swellings ; in July, - Andricus (noduli) radlcis. 



59 (62) On the roots. 



60 (61) Polythalamous, hard, brown, irregular, from 1 to 3 inches in 



length, situated close to the ground, - Andricus radicis. 



61 (60) Monothalamous, situated on the rootlets, often in clusters, 



irregular in shape, Biorliiza aptera. 



62 (63) In the bark on the thick roots, or on the trunk where there is 



a wound ; the gall sunk in the young wood ; cap-shaped — 

 conical at apex ; the top falling off when old, Andricus corticis. 



63 (64) A swelling on the trunk where a wound has been, not differing 



from the root galls, Andricus radicis. 



64 (65) On young branches, covered with earth or vegetation ; conical, 



hard, woody, deeply furrowed, reddish-brown, reddish and 

 juicy when young, Andricus Sieholdii, 



65 (64) On the catkins. 



66 (69) The small galls enveloped in a mass of woolly hair. 



67 (68) The mass of hair large, from 20 mm., dense; June, 



Andricus ramuli. 



68 (67) The mas3 of hair small, not dense ; May and June, 



Andricus (cirratus) ccdlidoma, 



69 (70) Globular, bare, succulent, green with reddish cheeks, 



Neuroterus haccarum. 



70 (71) Spindle-shaped, shortly pedunculated, green, tinged with red, 



Andricus seminationis. 



71 (72) Irregularly oblong or oval, the sides keeled; green; at least 3 



mm. in length, Andricus 4-lineatus, 



