JOURNAL 



Jlt\a ]BoFh €|nlQniQlogirfli ^oriFJ^g. 



Vol. XXII. JUNE, 1914. No. 2. 



UNITED STATES AND MEXICAN RECORDS OF 



SPECIES OF THE GENUS DORU (DERMAP- 



TERA; FORFICULID^). 



By James A. G. Rehn and Morgan Hebard. 

 Philadelphia, Pa. 



The variability found in the species belonging to the present genus 

 has caused numerous synonyms to be erected during the period when 

 very few specimens were to be found in collections ; this difficulty was 

 augmented by the apparent fact that practically no actual comparisons 

 were made. Recent efforts to retain some of these synonymic names 

 in varietal rank have only served to augment the confusion. Study 

 of the large series of specimens before us, and of Scudder's types, at 

 once shows that three distinct species of the genus exist within our 

 boundaries ; one of these is widely distributed as far south as the 

 Argentine Republic, in South America, the other two have never been 

 found outside the United States. These species may be separated by 

 the following key : 



A. Entire insect compact.-N Spine of pygidium of male not nearly as long as 

 distal abdominal segment. 

 B. Wings exposed. Spine of, pygidium of male acicular, not one half as 

 distal abdominal segment. Forceps of male curving scarcely or very 



slightly upward in distal third lineare (Eschscholtz). 



BB. Wings not visible. Spine of pygidium of male acicular, one half as 

 long as distal abdominal segment. Forceps of male curving more 



decidedly upward in distal third aculeatum (Scudder). 



AA. Entire insect more attenuate. Spine of pygidium of male as long as, or 



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