10 BUTTERFLIES OF MAINE. 
nervure which will be the last or highest number. The same 
system is observed in the hind wings, but in some moths 
there are three separate veins behind the median which are num- 
bered, 1 a, 1 b, and 1 ¢, in order going out from the hinder 
border. The portion of the wing included between the 
subcostal, median and the transverse nervures is called the 
discoidal cell, and this is sometimes divided by what are 
called cellular nervules, and are distinguished as superior 
and inferior according to their position. 
COMMON NAMES. 
The common names of the butterflies have been omitted 
in the body of this paper, and it would be as well to omit 
them entirely since they are only local, the same insect being 
called by different common names in different places, while the 
scientific names, when established, hold everywhere without 
change, and I should advise all to use them in preference to 
the common names. 
The scientific names in this paper are divided into syllables, 
and the syllable which should be accented in pronunciation 
is marked by an’ mark following it. As some may greatly 
desire the common names, they are given in the following 
list against the scientific names. 
The scientific name of an insect consists of two words, 
the first being the generic name or the name of the genus 
(surname), and should always begin with a capital letter ; 
the second is the specific name and should begin with a small 
letter, though writers differ on this point. The specific name 
is followed by the name of the entomologist who described 
the insect originally, and gave the name to it, though the 
initial letter or the abbreviation of his name is generally 
used. 
The arrangement and nomenclature adopted is that of Mr. 
W. H. Edwards, soon to appear in his Catalogue of the 
Butterflies of North America. I have also availed myself 
freely of the published writings of Messrs. Edwards and 
