504 THE ENTOMOLOGIST. 



beneath one leaf. The third appearance is Thelaxes dryo- 

 phila : it is generally stationed along the ribs of the leaf, and 

 especially along the midrib, and therein resembles Callaphis 

 Juglandis, which clusters along the midrib of the walnut-leaf, 

 and is the only Aphis which feeds on the upper side of the 

 leaf; the Thelaxes sometimes lives in companies in oak- 

 apples, the formation of which probably surrounded the sole 

 ancestor of the colony, and thus supplied food and shelter. 

 The fourth appearance is the delicate little Aphis called 

 Callipterus annulatus : it is scattered on the leaf, and its 

 semi-transparent body differs widely from the opaque, velvety 

 covering of the Thelaxes; it is sometimes of a blackish hue, 

 which is perhaps indicative of its having the grub of Myina 

 flava within it. The fifth appearance is the destroyers of 

 these Aphides, such as the larva of Anthocoris and that of 

 Scymnus, which latter has a resemblance to a Dorthesia. 

 The sixth appearance is the elegant lemon-coloured Ceci- 

 domyia of the oak, which, as is usual in the species of 

 that genus, is accompanied by a little black Platygaster. 

 August 2Srd. — The three representatives of Aphides before 

 mentioned are now much diminished in number, and there 

 are many whitish blotches, the habitations of subcutaneous 

 Micro-Lepidopterous larvae, but from these coverings a 

 brilliant green little Entedon, far more beautiful than an 

 emerald, occasionally proceeds. The spangles have now 

 generally attained their full size, and frequently one over- 

 laps another, and sometimes their shapes are altered by 

 their mutual contiguity. Some of the spangles are only 

 half grown, others not larger than a pin's head, and this 

 difference requires some explanation, for the oviposition, 

 which is the first agency in effecting a spangle, seems to 

 be limited to a very short season. The little Synergus 

 is now engaged in its last work, traversing the spangles 

 and inspecting them by means of the sense seated in its 

 antennae, with regard to the selection of one suitable for 

 its egg. The spangle thus selected loses its simplicity, or its 

 whole subservience to the growth of its first inhabitant, and 

 is appropriated by two inmates. Here it may be enquired, 

 Are the two eggs in the spangle in juxtaposition, or are they 

 far apart, so that each grub, when it is developed, may have 

 half of the spangle to itself? Another actor sometimes appears 



