1870.) 75 
Northumberland furnishes its quota, but the London district as yet 
bears off the palm, and Dorsetshire “labors hard to swell the list with 
the good things it yields.’ Except Berwickshire, these are the only 
places from which I have seen any examples of the Delphacide, and 
what may be expected from the yet unexplored parts, I leave my 
readers to judge for themselves. 
Amongst the continental species most likely to be added to 
our lists in this group are Delphaz crassicornis, Fab. (see genus 2, p. 
24) ; Liburnia stenoptera, Flor, closely allied to smaragdula and unicolor ; 
L. hyalinipennis, Stal, like a small neglecta; L. paryphasma, Flor, 
belonging to the leptosoma group; L. straminea, Stal; L. modesta, 
Fieb.; ZL. flaviceps, Fieb.; L. limitata, Fieb.; L. protrusa, Flor; L. 
paludosa, Flor; L. flaveola, Flor; ZL. spinosa, Mink (somewhat like 
L. cognata, but with a black abdomen, or with a row of yellow spots 
down the middle of the back); Z. Bohemanni, Stal, somewhat resem- 
bling pullula, but larger, and Metropis Mayri, Fieb., a black species with 
a head shaped like that of LD. mesomelas. 
In conclusion, I consider it an extremely interesting point that 
the similarity of many of the species is so great that they can be broken 
up into what I call parallel pairs. Indeed, so similar are the creatures 
of each pair, both in the developed and undeveloped form (7. e., with 
complete elytra and wings, or with incomplete elytra and no wings), 
that, except by the form of the genital segment and the styloid pro- 
cesses, it would be next to impossible to separate them. With the 
exception of the first-named, and of L. basilinea, Germ., all the species 
are British, and their diagnostic characters have been already given. 
They are as follows :— 
Delphaz crassicornis, Fab., and D. pulchella, Curtis. 
Lnburnia fuscovitiata, Stal, and L. lineola, Germ. 
5s smaragdula, Stal, and L. unicolor, H. Schf. 
by pellucida, Fab., and ZL. discolor, Boh. 
ye speciosa, Boh., and L. basilinea, Germ. 
as Fieberi, Scott, and L. lepida, Boh. 
5 leptosoma, Flor, and L. niveimarginata, Scott. 
ce cognata, Fieb., and L. exigua, Boh. 
Stiroma affinis, Fieb., and S. nasalis, Boh. 
3  albomarginata, Curtis, and S. mesta, Flor. 
The next paper will comprise the British species of Oiriide. 
(To be continued.) 
