26 CLASSIFICATION OF THE ALEYEODID^. 



Genus DIALEURODICUS (Cockerell) n. gen. 



Forewing with radius^, radial sector, and media retained. Vertex 

 produced into a prominent cone-shaped process. Antenna) of seven 

 segments, of which the third is the longest. Paronychium of the 

 foot represented by a stout spine. Pupa case flat ; no compound 

 pores present but simple pores, either scattered over the surface or 

 somewhat collected into areas; vasiform orifice small, lingula setose, 

 short conical, included and armed with four spines. 



Type, cockerellii Quaintance. 



Species of Dialeurodicus. 



I. Dorsum of pupa case with scattered simple pores; large, oval, flat, size 

 about 1.63 by 1.23 mm., yellowish brown ; surface without reticula- 

 tions; wax tubes formips the marginal rim, separated by rather 



shallow incisions. Adults with large spotted wings cockerellii. 



II. Dorsum of pupa case without scattered simple pores; large, oval, flat, size 

 about 1.7 by 1.40 mm. Dark brown to blackish (shiny jet-black 

 on leaf) ; surface with some reticulations ; wax tubes forming 

 margin of rim, separated by deep incisions tcsscUatus. 



III. Dorsum of pupa case with scattered simple pores and a broad subdorsal 



band all around of closely set simple pores divided by body sutures 

 into six more or less distinct patches. Subovate in shape, 

 size 1.5 by 1.12 mm., marginal wax tubes sepax-ated by shallow 

 incisions silvestrii. 



IV. Dorsum of pupa case with four pairs of wax-secreting pores on abdominal 



segments 4 to 7 and a submarginal rim all around of simple pores. 

 Dorsal disk dark brown, with four radiating patches of same color 

 on each side. Shape elongate, elliptical, narrowed cephalad, size 

 2.36 by 1.28 mm. Margin of case entire pulchcrrimus. 



Dialeurodicus cockerellii (Quaintance). 



(n. IV, figs. 1-14; PI. VII, fig. 1; text fig. 3.) 



Aleurodicns cockerellii Quaintance, Tech. Series 8, Div. Eut., U. S. Dept. 

 Agr., p. 45, (1900). 



ORIGINAL DESCRIPTION. 



Pupa case. — Size about 1.63 by 1.23 mm.; subovate in shape, smaller end 

 cephalad. Color uniformly yellowish. There is but slight waxy exudation 

 from dorsum, which is more or less mealy. No wax rods have been observed. 

 Dried specimens separate easily from leaf, leaving usually a ring of white 

 mealy wax of the size and shape of case; extending from the periphery inward 

 are light lines of this mealy wax, more or less distinctly marking the position 

 of the abdominal sutures of the case. Dorsum of pupa case almost flat, but as 

 seen under a hand lens is much wrinkled transversely in dried material. These 

 folds or ridges occur mainly along the body segments and posteriorly become 

 much curved around the vasiform orifice. Under the microscope the abdominal 

 segments are indistinct and scarcely elevated, except in the medio-dorsnl line, 

 where a slight rounded keel may be observed. Margin of case practically en- 



