140 
Psyche 
[Sept. 
recognized as distinct from Eutrombicula masoni (Ewing, 
1943) only on the basis of larval characteristics. 
According to Opinion 168 of the International Com- 
mission on Zoological Nomenclature, “it is to be assumed 
that the original author of a genus correctly identified 
the species assigned by him there to, ... . but that, 
where there is evidence that .... (this) assumption (s) 
is at variance with the facts, the case should be submitted 
with full details to the International Commission on Zoo- 
logical Nomenclature, and that pending their decision 
thereon, the genus should be regarded as of doubtful 
status.” 
In this case it seems that there is evidence that Jacot 
misidentified the specimens on which he based Trombi- 
culoides. The facts will be presented to the International 
Commission on Zoological Nomenclature. It therefore 
follows that until the Commission acts, Trombiculoides 
Jacot, 1938 must be considered as of doubtful status. 
Fortunately Eutrombicula Ewing, 1938, the name now 
used for the genus that includes the specimens on which 
J acot based his Trombiculoides , has priority over Trombi- 
culoides Jacot, 1938. The date of Eutrombicula is 15 
June 1938 while that of Trombiculoides is 10 October 1938. 
Therefore no change in the generic names is anticipated 
in settling the status of Trombiculoides Jacot, 1938. 
References 
Ewing, H. E. 1938. A key to the genera of chiggers (mite larvae of the 
sub-family Trombiculinae) with descriptions of new genera and species. 
J. Wash. Acad. Sci., 28: 288-295. 
Ewing, H. E. 1946. Notes on the taxonomy of three genera of trombiculid 
mites (chigger mites), together with the description of a new genus. 
Proc. Biol. Soc. Wash., 59: 69-72. 
Jacot, A. P. 1938. Thomas Say’s free-living mites rediscovered Psyche. 
Boston, 45 : 121-132. 
Say, T. 1821. An account of the arachnids of the United States. Jour. 
Acad. Nat. Sci., Philadelphia, 2 : 59-83. 
