APHILOTHRIX MALPIGHII. 87 
its bulk is visible, the lower third being concealed by 
the leaf-scales. These do not fall off. 
The gall is composed of two layers, the outer form- 
ing 4 soft, thick, sappy, green rind, which envelops 
the larval chamber all the while it is on the twig, but 
“‘when the gall falls out of the bud the sappy rind is 
loosened, and the woody inner gall left bare” (Adler, 
‘ Alternating Generations,’ p. 40). If, however, the 
gall is gathered before maturity, this exterior dries 
and shrinks, producing irregular reticulations which 
unite at the apex in a point, caused by a small cone 
beneath. The inner layer, which forms the larval 
chamber, has thin walls enclosing a large cavity, 
whitish inside. The outer surface of these walls is 
marked with a network of very fine irregular lines, 
only to be seen with the aid of a pocket lens. This 
portion becomes hard and woody when the gall is fully 
developed. At the point opposite the base grows the 
small cone previously mentioned, reddish or yellowish 
in colour. It is not visible while the rind is soft and 
thick. 
Aphilothrix Malpighii, Adler. 
(Plate XXITI, div. A.) 
Andricus Malpighii, Mayr, Cameron, Mosley. 
English name of gall.—‘“ Malpighi’s Gall.” 
Position of gall.—In axillary buds. 
Manner of growth.—Solitary, sessile, slightly pilose, spindle 
shape. 
Coloukes—* Green, often with reddish stripes” (Cameron). 
Average dimensions of a mature specimen. — Height, 
4.mm.; breadth, 15 mm. ; girth, 45 mm. 
May be sought during the months of September and October. 
Growth is complete by the end of September. ; 
The typical condition of the gall is unilocular and unilarval. 
The larva pupates in the gall. The imago emerges during the 
spring of the second year. 
Alternate sexual generation: Andricus nudus, Adler. 
