THE ENTOMOLOGIST 
KHBR OARS £916. [No. 633 
Morn XLEX.] 
THE GENUS ENNOMOS (Sens. Srr.), WITH AN ACCOUNT 
OF SOME OF ITS HYBRIDS. 
By J. W. H. Harrison, B.Sc. 
THE genus Hnnomos, as usually understood, contains within 
its limits two totally distinct genera, differing practically in 
everything more or less, but bearing a general superiicial re- 
semblance in the perfect condition which was strong enough, in 
the early days of Entomology, to cause the two groups to be 
assigned to the same genus. With the subgenus Deuteronomos, 
exemplified by the species D. alniaria (=tiliaria), I do not 
propose to deal in the present paper. It is the subgenus 
Ennomos (sens. strict.) with which 1 am immediately concerned. 
Irs History AND GEOGRAPHY. 
This subgenus contains but three species—two, EH. autumnaria 
(Wern.) and £. quercinaria (Hufn.), characteristic of the Euro- 
pean region, and one, L. subsignaria (Hubn.), found in Hastern 
North America, between Colorado and the coast, but more 
southern than northern in its tendencies, only keeping its hold 
on its northern outposts by more or less intense migrations. 
This recalls the spread of H. autumnaria to the British Isles by 
recent immigration. This latter species has been recorded by 
Staudinger and others as existing in North America and in 
Eastern Asia. As regards the North American region, this state- 
ment is absolutely incorrect, and is based on superficial similarities 
‘in size and colour. I have bred the so-called autwmnaria from 
Canada, and found that the insect belonged to the subgenus 
Deuter onomos, as was proved by ova, larve, and pupe, and by 
the structure of the imago, and, in particular, its specialised 
genitalia and the lack of spurs on its posterior tibie. Very 
probably the detached Japanese and Hast Siberian records are 
-of the same insect, as it stretches right across the more Northern 
parts of the Nearctic area, thus conforming in its distribution 
with those typical American insects which range into the Kastern 
dimits of the Palearctic region. This North American form was 
ENTOM.—FEBRUARY, 1916. D 
