THE FAUNA OF SCOTLAND. 73 



40 (43) Spindle-shaped, with a more or less longish peduncle — green, 



often with red longitudinal lines. 



41 (42) The peduncle as long, or nearly as long, as the gall; June, 



July, and August; 7-12 mm., - - - Andricus calUdoma. 



42 (41) The peduncle very short ; October ; 6-8 mm. , Andricus Malpigliii. 



43 (44) The gall very small (about 1-2 mm.), ovoid, granular, green; 



June, Andricus (gemmatus) corticis. 



44 (43) Not very small. 



45 (46) The gall enveloped in greatly developed leaf-scales, hiding the 



gall completely, forming a miniature artichoke-like body; 

 length, from 20 mm. ; in August, - - Andricus gemmae. 



46 (45) The leaf -buds not greatly developed and not completely hiding 



the galls ; length not more than 5 mm. 



47 (50) Globular, or at least not longer than wide. 



48 (49) In April or beginning of May; irregularly pea-shaped; green ; 



surrounded by the bud-scales, - - Neurokrns aprilinus. 



49 (48) In September and October; the gall with only its apex appear- 



ing out of the bud; green and smooth when fresh, when old 

 becoming reticulated, . - . . Andricus globuli. 



50 (47) Oblong, longer than broad. 



51 (52) Green, spotted with white ; length, 5-6 mm. ; the apex without 



asharp point; appearingin May and June, Andricus (dhojjunctata. 



52 (51) Not spotted with white; appearing in September and October. 



53 (54) The surface covered with whitish short hair, finely rugose; 



often keeled; conical, with a fine point at the apex; 

 brownish-yellow ; reddish when young, Andricus Clementinae. 



54 (53) The surface glabrous, shining, not finely rugose. 



55 (57) The apex endinij: in a distinct nipple-like point of a darker 



coLnir than the gall, .... Andricus collaris. 



