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Indiana University Studies 



gulate but without a projection into the radial cell; areolet of moderate 

 size, larger than in coloradensis, smaller than in wasatchensis ; radial cell 

 distinctly open; length 3.5-4.5 mm., averaging larger than in coloradensis. 



MALE. — Differs from the males of other varieties as follows: Wholly 

 black, often tinged dark rufous in spots, especially about the head ; parap- 

 sidal grooves wider and more distinct than in the male of wasatchensis ; 

 median groove distinct, extending two thirds to the pronotum; areolet 

 moderately large; radial area entirely open; length 2.7-^.0 mm. 



GALL. — More or less similar to the galls of other varieties, decidedly 

 smoother than in any others, with rarely a few short, rather stout spines; 

 more often elongate than in any othei's ; green, touched with rose when 

 young, becoming light olive brown and light brown with age. 



RANGE: Utah: Green River, Price, Provo. 



TYPES.— 99 females, 132 males, 70 galls. Holotype female, para- 

 type adults, and galls at The American Museum of Natural History; 

 paratype adults and galls at Stanford University, the U.S. National 

 Museum, the Museum of Comparative Zoology, the Philadelphia Academy, 

 and with the author. Labelled Green River, Utah; April 21, 1920; Kinsey 

 collector. 



The galls figured by Beutenmuller as tuberculator, refig- 

 ured by Felt, were collected in Utah by Uhler in the spring 

 of 1881, and are characteristic of this variety. 



Of 3,283 individuals bred, 1,535, or about 47 per cent, are 

 males. Material collected on April 18 at Provo, where many 

 adults had already emerged, gave only 28 per cent males ; 

 galls collected on April 20, at Price, where a few adults had 

 previously emerged, gave 42 per cent males; galls collected 

 April 21 at Green River, where most of the insects were still 

 larval, gave 55 per cent males. Note that the two later col- 

 lections were of less mature galls, for these localities are at a 

 much higher elevation ! The considerable differences in sex 

 ratios from the different localities were very probably due to 

 the males emerging mostly before the females emerge. The 

 insects live thru the winter as larvse, pupating only a very 

 short time before emergence in late April. Emergence dates 

 must be affected considerably by the development of the sea- 

 son at the different elevations. 



This variety is intermediate between coloradensis and 

 wasatchensis, just as its geographic position is intermediate. 

 Of the 255 Green River individuals examined in minute detail, 

 none show variation toward any other variety. The Price 

 and Provo material varies more. In regard to the nature of 

 the parapsidal grooves, which is one of the best single char- 

 acters to distinguish these varieties, we have these data: Of 



