Aphilotrix Malpighii. ^^ 



June, 1878, a great number of the flies had emerged, 

 I put them, on June 8, on an oak sapKng and saw them 

 begin to prick the small axillary buds, of which fourteen 

 in all were marked. About four weeks afterwards, on 

 July 5, I observed galls developing on three buds, which, 

 as they grew out of the buds with long stalks, were soon 

 recognizable as Aphilotrix callidoma galls. In the 

 beginning of August two more galls developed ; the 

 cause of this delay is difficult to explain, as all the buds 

 were certainly pricked at the same time. The gall 

 grows very quickly, reaches maturity in three weeks, 

 and then falls to the ground. 



[The tufted gall is found in May on Qiiercus sessiliflora.^^ 



12. Aphilotrix Malpighii. n. sp.^ 

 Gall. This gall is very like the preceding one and 

 of the same spindle shape, but shorter and more com- 

 pressed ; and it is usually either without a stem or with 

 a very short one. The time of maturity is different : it 

 appears much later than the former gall, does not show 

 itself out of the bud until September, and arrives at 

 maturity in October. (Fig. 12.) 



The development of this fly differs from the preceding. 

 The gall which matures in October undoubtedly con- 

 tains the full grown larva, but this does not enter the 

 pupa state in the same year. It rests till the next year, 



^ On account of the great resemblance to the Aphilotrix callidoma 

 gall it has often been confounded with it, but the fact that it possesses 

 a totally different sexual generation marks it as a separate species. 

 In memory of the circumstance that Malpighi nearly 200 j^ears ago 

 described the Aphilotrix callidoma gall, I have called the present 

 species after him. \Andricus Malpighii, Mayr.] 



