74 {September, 
Not readily confounded with any species that we know. The 
middle keels of the face are almost obsolete. 
Undeveloped form, 3. Head yellowish or brownish-yellow. Keels of the 
head and face white. Pronotum generally white. 
Scutellum yellow. Elytra more or less dark piceous, 
very narrowly somewhat paler along the scutellar 
region, posterior margin white. Abdomen black. 
Genital segment black, posterior margin above 
Wile. 27.5... Lie teees eeeee-..4, albomarginata, Curt. 
This is the D. adelpha of Flor. It is easily separated from similar 
species of Liburnia through its having two middle keels to the face. 
Undeveloped form, 8. Pronotum white, anterior portion clear pale 
yellowish-brown. Scutellum clear yellowish-brown, 
sides and apex white. Elytra clear pitchy-brown, 
shining, posterior margin white. Abdomen black, 
margin of the last segment white. Genital segment 
on the sides black, above and posterior margin 
White 2200. oe. cee oes oo oes vac car on 0astha) ane 
Somewhat larger than the last species, but extremely difficult to 
separate from it. The different form of the opening of the genital seg- 
ment, when viewed from behind, the white margin to the last abdominal 
segment, and the white upper portion of the genital segment are the 
most striking outward characters whereby to distinguish this insect 
from ¥. albomarginata. 
My task, as far as my knowledge of the species of Delphacide of 
this country is concerned, is now completed; and, although my in- 
vestigation of this family, both anatomically and otherwise, has enabled 
me to treble the number of species hitherto recorded as British, yet I 
am far from believing that these are all its representatives to be met 
with in this country. Their minute size and great resemblance to 
each other in many instances (as noticed below), and their extremely 
active habits, rendering them so difficult of capture in the net, have led 
me to this conclusion. From Ireland I have not seen a single in- 
dividual; and as to Scotland, whence I believe many additions will 
yet come, the few observers who have done anything have either been 
limited as to time, or merely taken such species as fell in their way 
while collecting insects of other Orders. Wales pairs with Ireland, 
and the South-coast and Isle of Wight only return one or two members. 
