10 bulletin: museum of comparative zoology. 



Ephemeridae. 

 Euthyplocta intercalata, sp. nov. 



Type.— M. C. Z. 10,054. E. Colombia: Mediao. A. H. Fassl; 

 British Guiana: Bartica. H. E. Parish; Guyane Fran9aise. E. 

 Le Moult. Four specimens. 



9 Resembles E. hecuba, about as large, and colored about the same; 

 the costal area toward base is rather darker than in E. hecuba. Dorsal 

 abdominal segments pale, with the posterior margin of each darker. 

 It is separated at once from E. hecuba by the presence of five pairs of 

 long intercalaries in each fore wing; one pair between lower branch 

 of vein 7 and vein 8, one pair between upper and lower branches of 

 vein 7, one between veins 6 and 7, one between upper branches of 

 vein 6, and one between vein 5 and lower branch of vein 4. Vein 8 

 has a long branch parallel to it (as in E. anceps). 

 Expanse 50 mm. 



Campsurus parishi, sp. nov. 



Type — M. C. Z. 10,055. Ecuador: Durar, 21 June. H. S. Parish. 

 Four specimens. 



cf Body pale; head blackish between eyes, dark on metanotum, and 

 at tip of abdomen; legs of front pair blackish, their claws white, and 

 nearly as long as last tarsal joint; setae wholly pale. Costal veins 

 heavier and grayer than others so that the costal area appears dark- 

 ened, rest of wing whitish hyaline with white venation. Vein 8 has 

 one branch which soon forks, but few if any cross-veins between these 

 forks nor to the hind margin of wing. The male genitalia (Plate 1, 

 fig. 5) shows the middle pair of appendages very long, more than half 

 as long as the lateral ones. 



Expanse 24 mm. 



Thraulus trijuncta, sp. nov. 



Type.— M. C. Z. 10,056. Peru: Lima,' 21 August. H. S. Parish. 

 Two specimens. 



Head black between eyes; thorax brown, sutures and ridges on 

 sides white; pronotum white on sides; tip of scutellum pale, basal 

 abdominal segment dark brown, next five segments very pale, each 

 with a dark dot each side, seventh segment dark brown in middle. 



