THE MORE IMPORTANT ALEYRODID.^. 



91 



varietal name arizonensis. AJeyrodcs aurantii Maskell was described 

 from specimens on orange from the northwest Himala^^as, the leaves 

 received by Maskell being thickly covered with the pupa cases. 

 Aleyrodes viarlatti Quaintance occurs on orange in Japan, and .4. 

 spinifer Quaintance on Citrus sp. and rose in Java. 



For the past three or four years the Bureau of Entomology lias 

 received from Cuba orange leaves infested with an undescribed species 

 of Aleyrodes^ the description of which is given herewith: 



Aleyrodes howardi ii. sp. 

 (Plate VII: text tigs. T,, 24.) 



Ecig. — Uniform brownish in color, without reticulations, curved; size about 

 0.18X0.09 mm. Stalk short, eggs lying prostrate 

 on leaf, arranged more or less in circles or. curves. 



Larva. — Color and structure essentially as in 

 pupa case. 



Pupa case. — Size about 0.9X0.55 mm., subellip- 

 tical in shape. Many- specimens with more or less 

 evident indentures on cephalo-lateral margin of 

 case, with cephalic end obtusely pointed. Color 

 on leaf under hand lens with secretion removed, 

 yellowish brown varying to blackish ; under trans- 

 mitted light yellowish to brownish yellow. There 

 is a distinct marginal rim all around, with wax- 

 tubes distinct, the incisions acute and tubes 

 rounded distally. Fnmi margin of case all around 

 arises a short rim of wax, composed of individual 

 wax threads, serrated on margin as seen under a 

 high power of microscope. Case usually quite 

 covered by a very copious secretion of grayish, 

 curling wax rods, which is very consi)icuous on 

 l)adly infested leaves, quite hiding the insects be- 

 ne.ath (PI. VII, fig. 1; text fig. 23). Denuded of 



secretion, pupa case is seen to be at first almost flat, but later becoming 

 <onvex as the insect develops, with segments distinct. 



Dorsum with pair of strong setie on first abdominal segment, a pair at vasi- 

 form orifice, and a pair at caudal margin extending some distance beyond 

 margin of case. Vasiform orifice relatively small, subcordate, the rim dark 

 brown, from G to 8 strong setje or spines arising from caudal mai-gln ; operculum 

 largely filling orifice, the distal margin with 2 faint notches; lingula not 

 distinguishable (see fig. 24). 



Adult female. — Usual; body yellow, wings inunaculate; length of body about 

 0.84 mm.; hind tibias 0.35 mm.; fore wing, 1 mm. long by 0.:^>G mm. wide. Hind 

 tarsus, O.IG mm. 



Male. — Not seen. 



Food plant. — Orange. Collected at Artamisa, Cuba. I'ebruary 5, 

 1005, by C. L. Marlatt. and at Habana. Cuba, February 1!). V.)0?>, by 

 E. A. Schwarz. Received from Dr. :Mel. T. Cook. June 6, 1905, froiii 

 Santiago de las Vegas, Cul)a. 



Judging from the abundance of this insect on orange leaves re- 

 ceived from the above-mentioned sources, this is a very serious pest 



Fici. 23. — Aleyrodes liowardi, show- 

 ing copious secretion from pupa, 

 on lower surface of orange leaf. 

 (Original.) 



rather 



