290 



THE ENTOMOLOGIST. 



33. ApliilotUrix callidoma, Hart.— This beautiful spindle- 

 shaped and long-stalked gall breaks forth from the axils of 

 Quercus pubescens in such a manner that the small bud, 



Fig. 33. 



a be 



a. Aphilothmx calltdoha in situ. b. Detached, c. A section of the same. 



from the point of which the thin pedicle proceeds, is not 

 altered externally. The gall is about the size of a barley- 

 corn, either short or long spindle-shaped. Its surface is 

 green or red when recent; later on it becomes reddish brown, 

 and exhibits a few or many either sharp or indistinct longi- 

 tudinal striations. However, in some specimens there is not 

 a trace of these striations to be detected. The top of the gall 

 is marked, and terminates in a wart or short cone: it has a 

 yellow-brown colour, and is bald; the remaining part of the 

 gall and the foot-slalk are scantily covered with moderately 

 short, white, deflected hairs. Sometimes one meets with 

 specimens in which the thin stalk is rather short, and the 

 basal half of the spindle very long, with the upper half, 

 however, very short. In the section the cell appears as a 

 large, longitudinally oval cavityj bordered by a thin, white, 

 inner gall, which is on all sides conterminous with the substance 

 of the gall ; above and beneath this inner gall is found a 

 brown reticulation. According to Dr. Giraud's observations 

 the galls are found from the month of July to October, and 

 the earliest fall off, whilst others are only beginning to 

 develop themselves. I have myself only found them once late 

 in the autumn. — G. L. Mayr. 



This gall was first described by Malpighi ; and Hartig did 



