KPU’OKT ON KCONOMIC ENTOMOLOGY 
22 !) 
wavy transverse lines, which form, when the moth is at rest and the wings closed, three 
W-shaped letters. Another form frequently seen resembles the above except that the 
green scales are replaced by bright yellow ones. 
third form sometimes noticed is figured on Plate XXVII., fig. 5. 
Body length, 8-10 mm. Wing expanse from 22 mm. 
Food plants. — The Egyptian boll-worm has been found attacking most of the plants The boli- 
belonging to the Nat. Order Malvacece that occur in this country, including hamia and kirkidi. 
Frevenfions and remedies .— No definite remedy can be suggested for this pest, but it can, 
to a large extent, be kept in cheek by clean cultivation. 
All stray cotton and other plants belonging to the Nat. Order Malvnceic should be 
uprooted and destroyed. 
The remnants of an infested crop should, when possible, be burnt, and should certainly 
never be allowed to remain in the field after the crop has been gathered. 
Where sufficient labour is available infested shoots and bolls might bo collected and 
burnt while the plants are still young. 
Finally, the use of trap crops might be resorted to— -i.e. small areas of land sown with 
cotton at such times that the plants will be in bloom, just before the main croji comes up and 
just after it is gathered. Many moths will be attracted to lay their eggs on these plants, 
which should then be collected and burnt. 
For a more detailed account of the habits, etc., of the Egyptian boll-worm the reader 
is referred to the Year-hook for 1905 of the h'hedival Agricultural Society, Cairo. 
The Kud.yn Cotton Poll-wokm 
I lipiinrp.sis castanea, Ilampson 
Plate XXIX 
This boll-worm was first observed attacking cotton growing in the Laboratory garden 
in 1906. It has since been seen on the Covernment Experimental Farm at Halfaya, and a 
single larva was taken in 1907 at Kittiab. It is probably an introduced species, but has 
been given the above name to distinguish it from the Egyptian boll-worm, Farias insidnna. 
Larvffi were reared in the Laboratories from eggs collected in the garden during 1906, 
but, owing to my departure from Khartoum before the adults emerged from the pupm, no 
perfect moths were obtained. 
The accompanying illustration (fig. 3) is taken from a specimen kindly given me 
by Mr. Willcocks, Entomologist to the Khedival Agricultural Society, Cairo, who had 
had a number sent him from Uganda. 
Other countries from which it is recorded are Beira and Delagoa Bay. 
Life-history and habits .—The eggs are dejjosited singly, either on the stem, leav^es or 
involucre, the usual position being the young terminal leaves. The larva, on hatching, 
bores into the nearest flower-bud or boll, which it hollows out before deserting it in favour 
of another. It may destroy several bolls before attaining maturity. 
When full-fed it drops or crawls to the ground and, burrowing into the soil, j)upates 
within a strong cell (fig. 5) composed of particles of earth cemented together with saliva. 
There are probably two or three broods during the winter. 
The summer was passed, by the few kept undei- observation, in the pupal stage. 
Only one, however, lived until the following winter, when it died witliout completing 
its life-cycle. 
Egg (fig. I).—When first laid the egg is bright turquoise blue in colour, but, prior 
