232 THE ENTOMOLOGIST. 
Observations.—Described from specimens taken by Miss 
Dorothy Jackson on rushes on marshy ground. They are, she 
says, ‘‘extraordinary aphides, found usually singly resting on the 
tips of the leaves. They were quite conspicuous, being covered 
with greyish-white tomentum. The moment the grass was 
touched they dropped off.”” The small lineal ova were also found 
on the leaves covered with whitish-grey tomentum. The 
Thrips-like appearance of the insects is very marked. From 
Laing’s redescription (‘Ent. Mo. Mag.’ lvii, 120, 1921) of 
Walker’s Aphis cypert it appears that this is the oviparous stage 
of that insect, although, as Mr. Laing kindly writes me, there 
are certain minor differences, such as size, slightly different 
antennal proportions, and absence of sensoria on segment ill 
of the antenne; all of which are quite likely in the oviparous 
stage. 
Pterocomma jacksoni, nov. sp. 
Apterous viviparous fenale.—Variegated in colour, ground-colour 
pinkish-brown, but median area of the abdomen pale greenish, 
merging into pink in region of the cornicles; a pale dorsal line 
commences on the mesothorax and is continued to the cauda. On 
the sides of the thoracic segments are blotches of very dark green ; 
these are continued on the three median abdominal segments, 
interrupted on the segment in line with the cornicles and then 
continued as darker green patches to the end of the body. Some 
specimens are unicolorous pinkish-brown.. Legs ochreous, with 
apex of femora and tibie and all the tarsi brown; in hind legs all the 
tibiz are brown. Proboscis long, ochreous, apex brown. Antenne 
ochreous, with basal segments brownish and apex dusky. Cornicles 
ochreous, in some bright orange. Venter uniformly yellowish or 
pinkish yellow, with a brown spot at apex of abdomen. Eyes black. 
Body, especially venter, dusted with tomentum. Hairs on legs 
rather close and sloping towards the apex (not more or less erect as 
in populeus). Antenne about half the length of the body, with long, 
rather dense hairs; basal segment a little longer than second ; third 
the longest, with 7-9 round sensoria on the basal three-fourths ; 
fourth segment about as long as fifth, the latter with the usual sub- 
apical sensorium ; sixth a little longer than fifth, its basal area not 
quite so long as the flagellum, the basal area has many fine long 
hairs like the others ; proboscis reaching to third coxe. On the 
pronotum a marked papilla on each side, normally truncate. Body 
very hairy. Legs very hairy, fore pair rather short and thick; mid 
longer; the hind with very long and densely hairy tibia. Cauda and 
anal plate very hairy, the latter rounded and the former longer and 
narrower, but rounded. Cornicles about as long as fifth antennal 
segment, narrowed at base, slightly swollen near apex, where it is 
constricted; apex flanged; nearly twice as long as hind tarsi. 
There is a small pale crenulated membrane on the inner side of the 
femoro-tibial joint. The immature forms show abdominal lateral 
papilla and have no antennal sensoria and shorter legs. 
Length, 3 mm. 
