THE CANADIAN ENTOMOLOGIST. 53 



insect, including the wings, with the shght exceptions noted above, a 

 dusky yellowish bi'o'ivn. Length .22; wing .23 ; antennje .13. 

 Described from Uving specimens. 



Cynips Q. agrifoliae, n. sp. 



The galls from which I have reared this really fine species were sent 

 me from California by my brother, H. D. Bassett, of San Francisco, with 

 a branch and leaves of the oak on which they grew. They grow on the 

 twigs of Quercus agrifolia, one of the family of evergreen or live-oaks. 

 The first specimens sent me reached me in November, 1877. From these 

 perfect insects appeared Dec. 21st, 1878. Whether the larvae matured 

 earlier or later in the warm room in which they were kept, than they would 

 under normal conditions, I cannot say ; but from what I know of other 

 species, I judge this had little effect upon their development. 



As they mature in the autumn, and as all tliat I have yet reared are 

 females, and as these bear a close resemblance to the other agamous 

 species known to me, I conclude that these are the one-gendered gener- 

 ation of a dimorphic form. The gall fly is even lighter in color than C. 

 Caiifor?iica, and these two species differ very greatly in this respect from 

 any other species known to me. 



Galls : Mcnothalamous, perfectly round, very hard, and internally of 

 a dense cork-like consistence, like the galls of C: globuhis. They are from 

 ^ to ^ of an inch in dimater. The surface is microscopically pubescent 

 and uneven, and the color varies in different specimens (dry) from a rather 

 dark, dull clay color to that of raw umber. The single larval cell is 

 adherent on all sides to the gall substance. The point of connection of 

 the gall with the twig is scarcely discernible in most specimens, in others 

 it is indicated by a minute dot from which fine lines radiate. I learn that 

 these galls are so abundant that the ground is sometimes almost covered 

 with them. 



Gall fly : Head, and with slight exceptions, the entire body, are 

 extremely pale yellowish brown, the head and the lower part of the abdo- 

 men palest, the first somewhat translucent. Eyes, ocelli and the tips of 

 the mandibles jet black and contrasting beautifully with the prevailing 

 color. Antennae 14-jointed ; 2nd half the length of the ist, not globose ; 

 3rd long ; 4th to 8th gradually shorter, the remaining six short and of 

 equal length. The antennae light, deepening to dark brown towards the 

 extremity. 



