AN UNDESCRIBED ORANGE PEST FROM HONDURAS 1 
By A. C. Baker 
Entomologist , Fruit Insect Investigations , Bureau of Entomology, United States 
Department of Agriculture 
When specimens of the “citrus blackfly” (Aleurocanthus woglumi 
Ashby) were first studied by Dr. A. L. Quaintance and the writer, there 
was no indication that in a few years it would become one of the most 
important of orange pests. It was known only as an undescribed 
aleyrodid occurring on the orange in certain parts of India and Ceylon. 
Apparently it was held in check there by natural factors. Its new 
environment in the Western Hemisphere, however, has lacked these 
factors. 
In March, 1920, Dr. W. M. Mann took a species of this same family 
(Aleyrodidae) at Ceiba, Honduras, where it occurred abundantly on orange. 
As will be seen from Plate 2, the species is controlled in its natural envi¬ 
ronment by the attacks of parasites, and it is therefore of potential im¬ 
portance to the citrus-growing regions of other countries where it might 
become established without these parasites. It seems wise to present a 
description of it, so that those interested may be acquainted with its 
appearance. 
Aleurodicus (Metaleurodicus) manni, n. sp. 
Egg. —Length 0.256 mm., width 0.096 mm. Color yellowish, sometimes with a 
brownish cast. Shape regular, not conspicuously flattened; stalk at extremity of egg, 
short. The stage available for study has a spherical orange colored body in the center 
of the egg. 
First instar (larva) (PI. 1, A).—Length 0.32 mm., width 0.14 mm. Color under 
the microscope transparent, with the exception of some orange-yellow on the abdomen 
and the purple eye spots. Margin entire. Twelve pairs of spines present, five pairs 
on the thorax and seven pairs on the abdomen, caudal and caudo-lateral pairs longest. 
Compound abdominal wax pores not visible. Vasiform orifice subcordate with the 
lingula included and rather broad distad. Abdominal segments distinct. Antennae 
(PI. 1, B) of three segments, long, slender, without bend, and tipped with a stout 
hair. Legs (PI. 1, C) extending considerably beyond the margins of the body, distal 
segment with one rather long curved claw and a stout spine, proximal segment with 
a long hair. 
Second instar (larva) (PI. 1, D).—Length 0.48 mm., width 0.304 mm. Color 
similar to that of the first instar. Margin entire. Vasiform orifice subcordate, with 
the lingula large but shaped similarly to that found in the pupa case. On the caudal 
portion of the dorsum, in the region occupied by the caudal pair of pores in later 
instars, is a pair of small porelike structures in which a central process can be distin¬ 
guished (PI. 1, E); on the thorax also are present two pairs of about equal size, one 
pair just cephalad of the eyes and the other pair half way between them and the 
abdominal line. Legs short and thick, terminating in a long spine. Within margin 
is a series of small setae. 
Third instar (larva) (PI. 1, F).—Length 0.656 mm., width 0.496 mm. Color pale 
yellowish or brownish, the yellow prominent on the abdomen. Small eye spots 
purple. Margin entire. Vasiform orifice (PI. 1, G) subcordate, lingula large and 
armed with two pairs of spines. Thorax with two pairs of reduced compound pores 
but these situated apparently in a different region from those found in the previous 
instar. Pores (PI. 1, H) with a distinct central process. Twelve pairs of spines 
present on the submarginal area Legs heavier and shorter than in the previous 
instar. 
1 Accepted for publication May a, 1933. 
Journal of Agricultural Research, 
Washington, D. C. 
aep 
Vol. XXV, No. 5 
Aug. 4, 1923 
Key No. K-110 
(*53) 
