Descriptions of Tertiary insects / by T.D.A. Cockerell.

  • Theodore Dru Alison Cockerell
Date:
1908
Catalogue details

Licence: In copyright

Credit: Descriptions of Tertiary insects / by T.D.A. Cockerell. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    10/18 (page 232)
    note was abundant at Pdorissant and Eysenhard- tia also grew there.* (7) A Mayfly from Florissant. Seven Epliemerids have been described from Baltic amber, and one from CEuingen. In America, Scndder lias described five nymphs and one adult from Florissant. I have examined the type of the latter (A! exsttcca) 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 ])recise generic reference. Fig. 5.—Ephemera howarthi, x 2. Ephemera (s. lat.) howarthi sp. nov. Length of body, excluding caudal setae, 15”” ; thorax about 5”” ; tliree slender caudal setae; head transversely oval, about 2“” broad, eyes about distant on vertex ; length of ante- rior wing 13””, costa very slightly arched, subcostal vein close to costa; outer margin about 9”” long, distinctly convex. Another specimen (from Sta. 13 B) is larger (anterior wing about 11:™”), but evidently the same species. Florissant, Station 11 (Zl D. A. Cockerell) \ also Sta. 13 B {Geo. N. Rohtoer, 1907). I have named this species after Mr. Ilowarth, 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) nigrostipel,lata G\dl. ined. was collected at Florissant by the Princeton expedition, and is now in the British Museum. The leaflets have the blade about long and 2| broad, and are almost exactly as in E. orthocarpa (Gray) Watson. The little black pointed stipels are like those of E. spinosa Engelin.