THE ENTOMOLOGIST’S WEEKLY INTELLIGENCER. 
7i 
merits than any criticism, we proceed to 
give some extracts showing how Mr. 
Wilkinson has treated that perplexing 
genus Dicrorarnpha. 
“ This is a very extensive genus, and 
hitherto a most difficult one to arrange, 
arising from several of the species pre- 
viously located in it being so very similar 
to each other as to render their discrimi- 
nation almost impossible; but which 
( Senectana and Saturnana), according to 
the present classification, belong to an- 
other family, and are consequently re- 
moved, leaving this group much more 
congruous and natural. The species as 
now recognised may always be known by 
a tooth-shaped dorsal blotch, of varied 
size and colour (usually yellow), some- 
times very distinct, at others scarcely 
visible. The perfect insects fly about in 
the sunshine, and some of them are of 
common occurrence. In the larva state 
they present several points of affinity to 
the Halonotat ; probably the whole of 
them live in the roots of herbaceous 
plants. 
“ The British species are nine in num- 
ber (several more are recognised on the 
Continent), and are arranged as in the 
following table : — 
A. Anterior wings with a pale sulphur- 
coloured, curved tooth-shaped blotch 
on the dorsal margin. . Species 1. 
B. Anterior wings with a pale sulphur- 
coloured, triangular blotch on the 
dorsal margin. . . . Species 2. 
C. Anterior wings witharichyellow (some- 
times dusky) tooth-shaped blotch on 
the inner margin. . Species 3, 4. 
D. Anterior wings with an indistinct 
triangular or curved tooth-shaped 
blotch on the dorsal margin, 
slightly paler than the rest of the 
wing , never yellow or sulphur- 
coloured. . .. . . Species 5 — 9.” 
Then follows a description of D. Peli- 
verella , after which we read — 
“An abundant species; variable in 
size, and a little so in colour. Allied to 
D. sequana, but is larger, and the pale 
dorsal blotch is more crescent- shaped and 
narrower. 
“ The imago appears in June and 
July, flying in the sunshine wherever the 
food- plant of the larva grows. It is 
generally distributed over the country, 
and occurs also in Scotland and Ireland. 
“ The larva is from four to five lines 
long, of sluggish habit and of a pinkish 
white colour. The head is luteous, 
shining, and the sutures chestnut-brown. 
The shield broad, shining, very trans- 
parent, with several small blackish clouds 
thereon. The anal segment slightly con- 
stricted. It is to be found in the roots of 
the yarrow ( Achillea millefolium ) during 
the autumn, living therein in the larva 
state till the following April, and is ex- 
ceedingly abundant.” 
Then follows a description of the 
next species, Sequana, after which we 
read — 
“ An uncommon species, tolerably 
"constant in size and colour. Allied to 
D. Petiverella, but smaller and having 
the dorsal blotch shorter, wider, with its 
apex truncate. The anterior wings are 
also broader. 
“The imago appears in June, flying 
at midday in grassy places. It occurs 
in Norfolk, Gloucestershire, Devonshire, 
near Croydon and other places in the 
Metropolitan district,” 
After the description of Politana, we 
read — 
“A rather common species; constant 
in size, but somewhat variable in colour. 
Of the size of D. Petiverella, but with 
the anterior wings narrower. 
