Lxoglossum. 153 
‘The phalaena devastator is never seen during the day; it 
conceals itself in the crevices of buildings, and beneath the 
bark of trees. About sun-dewn it leaves its hiding-place, is 
constantly on the wing, and very troublesome about the candles 
inhouses. It flies very rapidly, and is not easily taken. 
Such is the description of this formidable enemy to vegeta- 
tion. No efficacious method has yet been taken to prevent its 
ravages, but the one who could accomplish it, would do the 
cause of agriculture an essential service. 
Ant. XIV. Description of a New Genus of North Ameri- 
can Fresh-water Fish, Exoglossum, by C. S. Rarinesaue, 
Esa. iit 
Mn. LESUEUR has published, in the 5th Number of the 
Journal of the Academy of Sciences of Philadelphia, for Sep- 
tember, 1817, the description of a new fish, which he calls 
‘Yprinus mazillingua : he considers it as a very singular and 
anomalous species, owing to the peculiar structure of its lobed. 
lower jaw and tongue, which is external, and situated as an 
ippendage to the former. It was discovered in Pipe-creek, 
Maryland, in June, 1816, by said author, who confesses that 
& does not consider it as properly belonging to the genus 
Cyprinus, and presumes that when other species shall be dis- 
a possessing the same character, they will constitute a 
“parate genus. Although this principle and presumption is 
“rect, it was wrong to delay the formation of such a distinct 
senus, because only a species was then known, since so many 
nera are composed of single species. However, Mr. Le- 
“ueur’s expectation was verified even before he wrote it, since 
+ May, 1817, I had discovered in the Fishkill, state of New- 
ork, another species, evidently congenerous with the Cypri- 
‘7 marillingua, having the same structure of the mouth, &c. 
2 therefore venture to establish a separate genus for those two 
Pécies, having no doubt that many more will hereafter be 
added to it by accurate observers, and I give to it the name of 
