Kinsey, Ayres: Varieties of a Gall Wasp 



153 



255 Green River adults all of them have the grooves of 

 xerophila; of 674 individuals from Price, fifty miles nearer 

 the ivasatchensis type locality, 20, or 3 per cent, fail to show 

 the parapsidal grooves characteristic of xerophila, but in no 

 case are the grooves those of wasatchensis ; of 156 individuals 

 from Provo, another sixty miles nearer the wasatchensis local- 

 ity, but still almost one hundred miles removed, 12, or about 

 8 per cent, do not have xerophila, grooves, but only 2 of these 

 are distinctly wasatchensis. Here is an instance of two vari- 

 eties having adjacent, not well isolated ranges, being remark- 

 ably pure at more extreme localities, remaining remarkably 

 pure even where the ranges of the two overlap. It will be 

 highly profitable to make more elaborate studies of the varia- 

 tions of these varieties at other points. 



The galls of the two varieties are quite distinctive; there 

 is no great variation in our material from either of the type 

 localities, tho the Provo and Price material shows more 

 variation. These galls however more closely resemble the 

 xerophila galls, again emphasizing the nice measure the gall 

 is of the specific and varietal nature of the insect. 



All of these localities are more or less isolated geograph- 

 ically. Green River is located on a very alkaline and barren 

 plateau, about 5,000 feet high, distant from the next locality 

 likely to grow roses. Price is similarly located. Provo lies 

 at a lower elevation, on the edge of the desert, in the fertile 

 territory which lies more or less continuously, depending on 

 the location of the mountain streams which come out onto the 

 desert, along the base of the Wasatch mountains as far north 

 as Brigham, the type locality of ivasatchensis. Here is an 

 interesting instance of geographic isolation effecting some- 

 times more but sometimes less absolute segregation of vari- 

 eties. 



Diplolepis tuberculatrix variety wasatchensis, new variety 



FEMALE. — Is distinguished from other varieties of the species as 

 follows: General color rufous; head rufous with a large black patch 

 between the mouth and the compound eyes, extending to the bases of 

 the antennae; antennae with first three segments rufous, remaining seg- 

 ments black; thorax distinctly broader than in xeropJiila, medianly de- 

 pressed anteriorly between the anterior parallel lines; the parapsidal 

 grooves not as broad but more rugose than in xeropliila; median groove 

 distinct, extending two-thirds the distance to the pronotum; mesopleurae 

 bright rufous, edged with black; abdomen dark rufous; first abscissa of 



