UN IHJi UUIVIMUN OAK 169 



II. Cynipidae of which the Corresponding 

 Generations are as yet Unknown 



{a) Sexual Generation only 



Hymen- . In the terminal buds, rarely in the axillary ones. The 

 optera gall is formed by the welding into a mass 8 mm. high and 

 5 mm. in diameter of the internal swollen scales. Green, 

 then brownish. There are small and scarcely deformed 

 scales on the surface. Imago, April or May, I. Alternate 

 generation of Andricus osireus (?) 



Neuroterus Aprilinus Giraud 257 

 Syn. Spathegaster Aprilinus Giraud. 

 Connold, Oak Galls, pi. 52; Plant Galls, fig. 191. 

 Houard, No. 1215. Adler and Straton, Alternating 

 Generations, pi. 2, fig. 19a. 



,. On the male catkins. Gall ovoid, minute, 2 mm, high, 



I mm. in diameter, formed at the extremity of the filament 

 of a stamen, on the side of which the anthers form two 

 longitudinal swellings. Green at first, becoming brown 

 and covered with short yellowish hairs. Imago, May, I. 



Andricus amenti Giraud 258 

 Connold, Oak Galls, pi. 5; Plant Galls, fig. 219. 

 Houard, No. 1188. 



„ In an axillary bud. Gall 3 to 5 mm. in diameter, inserted 



by a very short stalk and bearing a little umbo at its apex ; 

 the surface, which is slightly wrinkled and yellowish-brown, 

 bears some short whitish hairs. The internal gall is quite 

 round, and lies in the centre of a cavity in the spongy 

 tissue. Imago, February or March, I. ; October or 

 November, II. 



Andricus Clementinae Giraud 259 

 Connold, Oak Galls, pi. 5 ; Plant Galls, fig. 176. Houard, 

 No. 1279. 



., In an axillary or terminal bud. Gall green or reddish- 



brown, about 6 mm. long, swollen and rounded below, 

 subcylindrical above. Entirely covered with a felt of long 

 snow-white hairs. Imago, spring, II., III. 



Andricus glandulae Schrenck 260 

 Connold, Oak Galls, pi. 10 ; Plants Galls, figs. 178, 179. 

 Houard, No. 1256. 



■. In an axillary bud ; the cupule is sometimes affected also. 



Gall rounded, often attaining the size of a hazel nut, pale 

 yellow, covered with very numerous projections, 4 to 8 mm. 

 long. Each projection is slender, erect or slightly bent, and 



