120 THE CANADIAN ENTOMOLOGIST 



deeper in colour than in J^; venation similar to that of J*. 



Holotypc. 1 ^, Ottawa (June 11th.) in Canadian National CoHectio^i. 



Allotype. 1 5, Ottawa (June 11th.) in Canadian National Collection. 



Paratypcs 6J^'s, 6$'s, Ottawa (June 11-14) in Canadian National Collecti(m 

 and Camhrldge Museum Collection. 



Baetis flavistriga N. Sp. 



(^. Size and general appearance of the preceding species; the superior eyes 

 however much smaller, forming, even in dried specimens, flat, oval disks of 

 a deep reddish hrown colour, which often slightly overlap. Thorax with 

 the yellow prothoracic spot and streak well-defined; legs dirty ochreous. 

 Primaries with the intercalaries less developed than in the preceding species, 

 those between subcosta and radius being much shorter; the cross-veins be- 

 tween the branches of the cubitus are also quite faint in distinction to 

 intercalaris where they are well-developed. In the genitalia the penes are of 

 more or less even width throughout and do not taper to the fine points 

 found in intercalaris. 



IJolotype. 1 ^, Ottawa (June 14th) in Canadian National Collection. 

 Paratypes. S cf's, same locality and date, in Canadian National Collection 

 and Cambridge Museum Collection. 



I have not yet definitely associated the ^'s of the above species; a series 

 of this sex is before me which differs from the ?'s of intercalaris in ]>ossessmg 

 a broad pale yellow dorsal stripe on the abdomen and further shows the differ- 

 ences in venation mentioned above. These specimens however may belong to 

 propinqitus ^^'lsh. as Dr. Banks mentions to nic that the female cotyi)e of this 

 species appears to possess such a stripe. In view of this I have thought it better 

 to leave the matter in abevance until such time as further collccliiicr or brcediufr 

 <.an settle the doubt. 



Explanation of Plate. 

 Fig. 1 X'enation of forewing of Bacfis intercalaris Mel). 

 Fig. 2 Male a])i)endages of Baetii intercalaris McD. 

 Fig. 3 Male apjicndages of Baciis flavistricja McD. 

 Fig. 4 Male ai)pendages of Baetis propinqitus \\'al>b 



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