122 
CREPUSCULARIA. 
form of the anteimsB, and other distinctive marks 
alre<ady described in our introductory observations. 
It contains species of very dissimilar aspect and 
economy, all of which, however, were included by 
Linnaeus and his followers in the genus Sphinx. 
Fabricius distributed them in three genera. Sphinx, 
Sesia, and Zygaena ; names which have since been 
employed to designate family groups. The indige- 
nous species have recently been divided into four 
families, which may easily be determined by the 
following brief external characters: — SpniNGiDiE, 
with the palpi short, and the abdomen without a 
terminal tuft ; Sesiid.®, with the palpi short, and 
the abdomen furnished with a tuft at the extremity ; 
jEoERiiDiE, with the palpi elongate, and the wings 
most frequently hyaline ; ZvoiENiD^ having the 
palpi likewise elongated, and the wings clothed 
with scales*. The latter family contains only two 
British genera, Ino and Anthroccra. The former 
of these corresponds to the Fabrician genus Procris : 
it has antennae very slightly curved, and thickening 
gradually from the base nearly to the apex ; those 
of the male with two rows of pectinations on the 
inner side, but they are merely serrated ’ in the 
female; the apex ■without a tuft of hairs. The 
palpi do not extend beyond the head, and are rather 
thickly clothed with hairs. The species are not 
numerous, and only one of them inhabits this 
country ; it is named 
Stephens' Illos. HausteUata, i. p. 104. 
