BIOLOGIA CENTRALI-AMERICANA. 
ZOOLOGIA. 
Class INSECTA. 
Order NEUROPTERA. 
Fam. EPHEMERIDA*. 
Materials for the account here given of the Ephemeride or Mayflies of Central 
America have been derived from the undermentioned collections and museums :—The 
collections of Messrs. Godman and Salvin, R. McLachlan, Baron E. de Selys-Long- 
champs; and the Museum of Comparative Zoology, Cambridge, Mass., the British 
Museum, and those of Brussels and of the Jardin des Plantes at Paris. These have 
yielded representatives of fourteen named and two unnamed genera, and nineteen 
named and thirteen unnamed species: total sixteen genera and thirty-two species, 
excluding a specimen of no account. ight species are described as new. 
Most of the genera of Ephemeride represented in the Central-American fauria have 
an extended range. About one-third of the number have been observed only in 
America, and two (including an unnamed genus) have not been found outside our limits. 
Particulars concerning their geographical range are given under the head of each 
genus; but it should not be forgotten that the distribution of Mayflies inhabiting 
tropical and subtropical countries is a subject with regard to which very little is 
known. 
The following Table (p. 2) shows the number of species that are now known from 
Central America, and in what portion of that country they have occurred. 
The genera are here classified in accordance with the plan adopted in “ A Revisional 
Monograph of Recent Ephemeride or Mayflies,” in the Transactions of the Linnean 
Society of London, 2nd series, Zoology, iii. (1883-1888), cited as ‘ Eaton, Rev. Mon. 
Ephem.’ 
An analytical key to the genera and larger divisions of the family will be found in 
that volume, commencing at p. 309. 
* By A. E, Eaton. 
BIOL. CENTR.-AMER., Neuropt., Aprid 1892. b 
