182 
BEITISH APHIDES. 
organs may be noticed in tbis species, whicli action 
probably is connected with some kind of circulation. 
The numerous oil-globules, however, are stationary and 
not propelled by any pulsating current. 
Myzus ribis^ no doubt, is Bhopalosiphum ribis of Koch. 
The last author, indeed, figures the larva with cylin- 
drical nectaries, which do not agree with the dilated 
characters of Bho^alosiphum, Passerini’s and my own 
specimens have cylindrical cornicles. Mr. Walker 
bears me out also by inserting B. ribis into his 
synonyms. 
Passerini notices seven other species of Myzus, but 
none of them have come under my notice as British. 
His Myzus tetrarhoda is probably Si^phonophora r os arum 
of Koch, 
Genus IV.— DEBPANOSIPHUM,* Koch, 
Sabel-Laus, Sickle-Aphis. 
Eostrum short. Penultimate joint long. 
Antenna long and fixed on the frontal tubercles. 
Third joint the longest. Fourth and fifth joints equal. 
Seventh setaceous. 
Cornicles large, curved, and dilated in the middle. 
Legs moderately long. 
Cauda inconspicuous or none. 
Wings long and narrow. Cubital vein twice forked. 
Stigmatic cell elongated towards the apex of the wing. 
Other veins parallel to each other or nearly so. The 
membrane slightly clouded towards the marginal ends 
of the veins. 
It has been stated by Walker and others, that there 
are no apterous viviparous females in this genus, by 
which only can be meant, that all the apterous females 
develop into pup 90 and thence into winged forms 
^ From Ap^Tvapov a sickle, and a-i^ojv a tube. 
