THE CANADIAN ENTOMOLOGIST. 69 



THE FRUIT-INFESTING FORMS OF THE DIPTEROUS 

 GENUS RHAGOLETIS, WITH ONE NEW SPECIES. 



BY J. M. ALDRICH, MOSCOW, IDAHO. 



The typical forms of Rhagoletis in North America are distinguished 

 by their black colour, the scutellum conspicuously white or yellow and 

 bearing four bristles, the wings with cross-bands, which may be somewhat 

 oblique and curved ; the anterior cross-vein is situated about the middle 

 of the discal cell ; first vein bristly along its whole length, the third vein 

 only at base. 



Two aberrant forms are included in the catalogue, suavis, which is 

 pale yellow, and caurina, which does not have bands on the wing. The 

 complexity of the relations of Trypetid genera makes it difficult to assign 

 all species to groups where they obviously fit, and it may be better to 

 admit these two species provisionally than to assign them to other genera 

 without examining specimens. 



Mr. Doane, Ent. News, 189S, 69, suggests that Rhagoletis zephyria 

 of Snow is a synonym of R. pomonella, and this I think is correct. 



Mr. Coquillett, Jour. N. Y. Ent. Soc, VII, 260, 1899, refers Acidia 



fausta and suavis to Rhagoletis, and I also agree with this ; the former, in 



fact, is the nearest known relative of intrudens, the new species described 



below : 



Table of Species of Rhagoletis. 



1. Colour pale yellow suavis, Loew 



Colour black or blackish 2 



2. Wing pattern in scattered spots, not bands caurina, Doane 



Wing pattern in bands 3 



3. Abdomen with pale cross-bands 4 



Abdomen without cross-bands, entirely black 8 



4. A hyaline cross-band extends entirely across the wing through the 



distal part of the discal cell 5 



The hyaline portion not extending entirely across 7 



5. Humeral and stigmatic cross-bands confluent behind. tabellaria, Fitch 

 Humeral and stigmatic cross-bands not connected 6 



6. With a brown spot on the apex of the third vein cingulata, Loew 



Without such spot ribicola, Doane 



7. The entire brown pattern of the wing continuous . . . .pomonella, Wish 

 The brown pattern discontinuous striatella, v. d. W. 



February, 1909 



