304 The Scottish Naturalist. 



thin membrane ; inner gall egg-shaped, at bottom of cavity ; 

 June. Andricus injlator. 



Terminal, closed all round, rather twisted ; inner gall (or 

 occasionally 2 or 3 galls), somewhat kidney-shaped ; May 

 and June. A. curvator. 



12. Galls on distinct stalks, spindle-shaped, 13. 

 Galls sessile, 14. 



13. Peduncle about as long as the gall, thin, 7 to 12 mm. long, 



green ; June to August. A. callidoma. 



Peduncle very short, otherwise as in last species ; October. 



A. Malpighii. 



1 4. Gall enclosed in enlarged bracts or leaf scales, like a small 



artichoke, the mass being about 25 mm. long ; autumn. 



A. gemma. 

 Leaf scales not enlarged, surrounding ripe gall, at least to hall 



its height, 15. 



Leaf scales small, hardly concealing any part of gall, 20. 



15. Oval or spindle-shaped, longer than broad, 16. 

 About as broad as long, 19. 



16. 5 to 8 mm. long, surface covered with yellowish-brown woolly 



hairs ; July. Andricus solitaria. 



Bare, not hairy, 17. 



17. 5 or 6 mm. long, oval, green, spotted with white; May and 



June. A. albopunctata. 



Not spotted, or with only minute white dots, 18. 



18. 6 or 8 mm. long, green, with red longitudinal ridges ; October. 



A. Malpighii. 

 2 or 3 mm. long, oval, pale yellow or red-brown, ending in a 

 nipple-like tip, which is often darker; autumn. A. 



[collaris. 

 2 or 3 mm. long, ovate, brown, tip not nipple-like or darker ; 

 autumn. A. autumnalis. 



19. Irregularly pea-shaped, 5 to S mm. long, yellowish or pale 



green, thin walled, with one or few chambers : April and 

 May. Nenroterus aprilinus. 



Globular, 3 or 4 mm. across, ends in a blunt yellow or red 

 cone above, which alone projects from leaf scales, green and 

 smooth, surface reticulated when dry ; autumn. A?idricus 



[globuli. 



