232 T. D. A. Cockerell — Descriptions of Tertiary Insects. 



note that Sapindvs was abundant at Florissant and Eysenjiard- 

 tia also grew there.* 



(7) A Mayfly from Florissant. 



Seven Ephemerids hare been described from Baltic amber, 

 and one from (Eningen. In America, Scndder has described 

 five nymphs and one adult from Florissant. I have examined 

 the type of the latter {E. exsucca) in the Museum of Compar- 

 ative Zoology. A much larger form is here described ; like 

 the other, it unfortunately does not show the characters neces- 

 sary for precise generic reference. 



Fig. 5. — Ephemera howarthi, x 2. 

 Ephemera (s. lat.) howarthi sp. nov. 



Length of body, excluding caudal setae, 15 mm ; thorax about 

 5 mm ; three slender caudal seta? ; head transversely oval, about 

 2 ram broad, eyes about ^ mm distant on vertex ; length of ante- 

 rior wing 13 mm , costa very slightly arched, subcostal vein close 

 to costa ; outer margin about 9 mm long, distinctly convex. 



Another specimen (from Sta. 13 B) is larger (anterior wing 

 about 14 mm ), but evidently the same species. 



Florissant, Station 14 (T. D. A. Cockerell); also Sta. 13 B 

 {Geo. N. jRohwer, 1907). I have named this species after Mr. 

 Howarth, of Florissant, who is known even in Europe as a 

 skillful creator of new genera and species of mayflies, of won- 

 drous form and color, used by fishermen to lure the speckled 

 trout. 



* Eysenhardtia (or Viborquia) nigrostipellata Ckll. ined. was collected at 

 Florissant by the Princeton expedition, and is now in the British Museum. 

 The leaflets have the blade about 5J- mm long and 2f broad, and are almost 

 exactly as in E. orthocarpa (Gray) Watson. The little black pointed stipels 

 are like those of E. spinosa Engelin. 



