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Indiana University Studies 



way inquilines replace the true gall maker and modify the 

 normal structure, but are instituting further studies. 



Rhodites globuloides Beutmuller is an inquiline-inhabited 

 gall very similar to the gall of neglecta, but occurring in the 

 eastern part of the United States. In 1892 Beutenmuller de- 

 scribed (Bull. Amer. Mus. Nat. Hist., IV, p. 247, pi. IX, fig. 4) 

 an insect from this gall as Rhodites globulus. In 1907 he 

 made a correction (Bull. Amer. Mus. Nat. Hist., XXIII, p. 

 638, pi. XLIV, figs. 2-6) as follows: ^The insect described 

 by me as Rhodites glohuhis is a guest-fly, synonymous with 

 Periclistis pirata 0. S., consequently a new name must be used 

 for the true gall maker. I propose for it Rhodites globuloides. 

 * * * The gall of Rhodites globuloides occurs on the 

 branches of Rosa Carolina and is quite common locally in cer- 

 tain localities. I have collected over a hundred specimens of 

 the galls from which I reared hundreds of its guest-fly 

 Periclistis pirata, but only a single specimen of the true gall 

 maker." 



All of our previous remarks concerning the improbability 

 of a very common gall having such a rare producer apply with 

 even additional force in this case. We have bred many hun- 

 dreds of the galls, and so have other workers, obtaining thou- 

 sands of inquilines but not a single gall maker. The holo- 

 type female, the only specimen which Beutenmuller had of a 

 gall maker, is in the American Museum. Our notes made 

 three years ago record the date on this holotype as April 25, 

 1882, which is ten years before the gall was described with an 

 inquiline as the supposed producer, and twenty five years be- 

 fore this true gall maker was described as coming from these 

 galls. This destroys any grounds for the connection of the 

 single specimen with any particular gall. 



Until we can find an opportunity to examine this insect 

 further, we cannot give a synonomy with any certainty. 

 Meanwhile it is to be observed that the original description 

 agrees entirely with females of Diplolepis ignota (Osten 

 Sacken). We have no data as yet to show what species of 

 rose gall becomes globuloides when inhabited by inquilines. 



