isoc] • 108 
AN ESSAY TOWARDS A KNOWLEDGE OF BEITISH HOMOFTERA. 
BY THE BET. T. A. MAHSIIALL, M.A. 
(Continued from page 85 J 
26. — lassus (/.) jJi'^isinus, Fall. 
Fusco-flavus vel pallide viridis, interdum svib-rufescens. Abdomen 
nigrum, segmentis flavo-marginatis ; $ subtus totum, (J apice tantum, 
flavescens. Vertex immaculatus. Frons obscure fusco-cancellata. 
Pronotum, scutellum, liemelytra, flavescentia, sub-nitida, immaculata : 
hsec abdomine longiora, sub-pellucida, membrana leviter infuscata: 
nervi concolores. Alae infuscata?. Pedes testacei ; tibise ad basin 
spinarum nigro punctse ; posticse iutus nigro-lineatae : ungues fusci. 
^ 5 . Long. 2| ; alar. exp. 5^ lin. 
Cicada prasina, P'all., Hem., 2, p. 40: Act. Holm., 1806, p. 27. 
lassus prasinus, Flor, R. L., 2, p. 352. 
lassus suhfusculus of the Brit. Mus. Collection. 
Aphrodes sulphurea^ Curt., B. E., 633, No. 10. 
Flor (1. c.) says that Cicada prasina, Fab., Ent. Syst., 4, 38, and 
S. E., 77, 70, — although quoted as a synonym by Fallen (1. c), — is not 
the present insect, but a Bythoscopus. He does not, however, give the 
reasons for this conclusion. The Fabrician enigma is as follows : 
" Flavo-viridis : alis cserulescentibus." The pale colour, rather larger 
size, and immaculate upper surface, suffice to distinguish both sexes 
from suhfusculus. The males are further separated by their external 
genital apparatus. In prasitms the laminae genitales are unusually 
long, three times the length of the valvula ; in suhfusculus they are 
only half as long again as the same organ. 
On various trees in woods, throughout the kingdom ; perhaps the 
easiest to meet with of all the larger lassi. The following species are 
smaller, resembling Eupteryx. 
27. — lassus (I.) virescens, Fall. 
Augustus, pallide flavus vel flavo-viridis. Abdominis segmenta 
5 prima supra medio nigra, vel nigro-limbata, lateribus late pallidis ; 
cjetera flaventia. Hemelytra pellucida, nitida, abdomine longiora {<$), 
vel paulo breviora ( ? ). Vertex acutangulus, apice obtuso, sua inter 
oculos latitudine vix brevier, pronoto lougitudiue sequalis. Tibise 
posticse ad basin spinarum vix fusco punctatse ; tarsi apice fusci. 
Anus ? apice albido setosus. ^ ? . Long. 2-2i ; alar. exp. 3| lin. 
Cicada virescens, Fall., Act. Holm., 1806, p. 33 ; Hem., 2, p. 52. 
lassus virescens, Flor, E. L., 2, p. 333 (?) 
