170 JOURNAL OF ENTOMOLOGY AND ZOOLOGY 



outside. The slight embedding of a portion of the end gives a 

 great deal of stabiHty to the attachment of the egg to the surface 

 of the gall. 



Entrance of larva into gall. — On July 7, on the surface of the 

 young gall, which was brought into the laboratory from the field on 

 July 2, for observing the development of the egg on it, I found 

 the broken egg-shell. Close by it a young larva was boring into 

 the epidermis, its head had bored in, its abdomen was still without, 

 and the latter was moving around. When the larva was carefully 

 removed, an admirable round hole on the surface of the gall was 

 seen. An advanced stage was found on August 4, the larva had 

 itself entirely got in the gall, and lived in a small tunnel made in 

 the common parenchyma, leaving a hole on the epidermis, which 

 was destined to be closed up sooner or later after the gall had grown 

 older. 



Larva. — At time of hatching the larva is about .5 mm. long and 

 .2 to .25 mm. broad. Its body is very soft and almost transparent. 

 The segments of the body are not very distinct, except when exam- 

 ined under a microscope. The head and the abdominal regions are 

 thinly covered with some fine hairs, and the head is much broader 

 than either the thorax or the abdomen. The eyes, which appear as 

 black spots on both sides of the head, are very conspicuous, each 

 eye consisting of two black spots, which are adjacent to each other 

 (Fig. 6, Plate II), and the mouth-parts brownish in color can be 

 seen from the ventral side. 



An advanced stage of the larva was found in a shallow tunnel in 

 a young gall. The hole on the surface, through which the larva 

 got in had not been closed up. This shows that the animal got in 

 not very long previously. The larva at this stage is about .9 to 1 

 mm. long and .33 mm. broad. The skin is darker and more opaque, 

 and the segments are more distinct than when just hatched out. Its 

 head is broader than either thorax or Ibdomen and in general its 

 shape is roundish. More pronounced are the hairs covering the 

 head and the abdomen. On account of the well developed mandi- 

 bles and maxillae the mouth-parts are very clear to view. The 

 forked abdominal end had not been much chitinized. 



