20 NEW YORK STATE MUSEUM 
our attention last July, by the reception of a number of gladioli 
bulbs badly infested with plant lice, although they had been pre- 
viously fumigated with sulfur. The insect must be exceedingly 
prolific, since one small box containing about a dozen bulbs had the 
interstices almost filled with exuviae and plant lice. The presence 
of large numbers of these insects injures the salability of the 
bulbs, since it weakens them materially and frequently results in 
a failure to bloom. This species has caused more or less trouble 
to some of our growers for the past two or three years, particularly 
in late winter. Examples of this plant louse were submitted to 
Mr Pergande, through Dr L. O. Howard, and by him pronounced 
to be an unknown species of aphis. 
Description. The very young plant louse is about .75 mm long, 
pale yellowish or whitish transparent with an obscure subapical 
orange band on the abdomen. The antennae are slightly fuscous 
apically, the tip of the beak, the distal tarsal segments and the cor- 
nicles being fuscous; the eyes are black. The antennal segments 
in this stage have the following measurements: Third .21 mm, 
fourth .o6 mm, fifth .141 mm. The cornicles are subcylindric, 
being .o9 x .045 mm. 
The partly full grown wingless female has the following anten- 
nal measurements. Third segment .195 
mm, fourth .12 mm, fifth .o85 mm, the 
sixth .415 mm, the cornicles being sub- 
cylindric, .135 x .o6 mm. 
The full grown wingless female is rather 
stout, a pale yellowish white, the head 
dorsally, frequently having a distinct yel- 
lowish cast and the subapical abdominal 
segments a deeper yellowish cast on the 

Fic. 6 Gladioli aphid, poste™ ‘ 
rior extremity of wingless fe- venter. The apex of the third, fourth and 
Renee cae ee ath aricerns| segments and the apexes of 
the tibiae, tarsi and the beak are fuscous: The cornicles are light 
fuscous and the eyes black. 
Winged female. Length 1.75 mm. This form is dark brown 
and yellowish, the antennae being mostly a fuscous yellowish, the 
head fuscous, the pronotal lobes a variable fuscous and separated 
from the mesonotum by a yellowish or deep orange area. The 
thorax has the median and two conspicuous submedian lobes 
fuscous. Scutellum fuscous, postscutellum light fuscous. Abdo- 
men a variahle yellowish orange and with a variable, oval, or sub- 
