16 



Indiana University Studies 



Probably thruout more eastern Texas and a part of Oklahoma and 

 Louisiana. 



TYPES. — 36 females, 3 pins of galls. Holotype female, paratype 

 females, and galls at The American Museum of Natural History; para- 

 type females and galls with the author; paratype females at the U.S. 

 National Museum, Stanford University, the Philadelphia Academy, and 

 the Museum of Comparative Zoology. Labelled Austin, Texas; February 

 12 to March 8, 1922; Q. stellata; Patterson collection number 6. 



This gall is very common on the post oaks in Texas. Pat- 

 terson states that the punctures from which the galls will 

 arise may be detected about the hrst of May, that the galls 

 do not develop from the scars until about the middle of July, 

 that the galls are fully grown in size by the first of October, 

 and in a couple of weeks most of them fall to the ground. 

 I have collected them in late November and December, but 

 the larvae are then still so small that they do not mature after 

 becoming dry. Evidently they need to be kept moist, as they 

 are when lying on the ground, to allow the insect to develop. 

 Patterson secured over a hundred adults which emerged from 

 February 12, 1922, to March 8. Inasmuch as the breeding 

 of the insect is difficult unless carefully handled on the field, 

 we are considerably indebted to Dr. Patterson for success- 

 fully rearing the adult. 



I collected the galls, but did not obtain the insects from 

 the other Texas localities listed. It is possible but not prob- 

 able that other varieties occur at some of those points. The 

 gall occurs on Q. breviloba at Leander, and Patterson reports 

 it as occasionally on breviloba at Austin. It is not unlikely 

 that the breviloba insect is a distinct variety with a range 

 centering about Burnett County, Texas. 



This is certainly a variety of Andricus dimorphus, de- 

 scribed as a Cynips (Beutenmuller, 1913, Trans. Amer. Ent. 

 Soc, XXXIX, p. 245) from galls taken by Weld at Evanston, 

 Illinois, on Q. macrocarpa. Similar galls have been recorded 

 and are common on white oaks of many species from the 

 whole of eastern United States. Unfortunately I cannot ex- 

 amine the types of dimorphus, and cannot furnish a compara- 

 tive description. Probably several different varieties occur 

 in several faunal areas, and possibly different varieties on 

 different hosts. This variety appears to differ from dimor- 

 phus in having the thorax less roughly rugose, the parapsidal 

 grooves and lateral lines smooth, and the first abscissa of the 



