^6 Observations 07i Cynipidae. 



enters the pupa state in the autumn, and the flies 

 emerge in April of the second year. 



Fly. 3 mm. in length ; reddish yellow, darker than 

 Aphilotrix callidoma ; thorax with black streaks, upper 

 part smooth, sides sparsely haired, scutellum rough ; 

 back of the abdomen dark brown ; legs reddish 3^ellow, 

 trochanters all brownish, as well as the upper half of 

 the femora and outer surface of the tibiae ; antennae 

 black. The colouring of this fly is so like that of 

 Aphilotrix callidoma that it can only be distinguished 

 with certainty from it when it has been reared from the 

 gall. I have not been able to make experiments in 

 breeding with this fly, but I have made some experi- 

 ments with the corresponding sexual generation and 

 these have afforded me trustworthy results. 



[Malpighi's gall is found in September on Quercus sessiliflora.'] 



12^. Andricus nudus. n. sp.^ 

 Gall. This little inconspicuous gall, 1-5 mm. long, of 

 an elongated oval form, with distinctly depressed apex, 

 is found on the flower stalks of the male catkins between 

 the anthers. The gall is naked but at its point it has 

 a few little hairs. When fresh it is green but yellow 

 when mature. (Fig. 12*^.) 



To rear the flies the galls must be collected at the 

 end of May ; the flies emerge in June. 



Experimental breeding. I succeeded in breeding 

 these flies without any difficulty. In 1877 I made my 

 first experiment. A quantity of fecundated females 



^ This species also has hitherto been undescribed. I have chosen 

 the name nudus because it differs from the drralus in being perfecth'' 

 bald. 



