MORPHOLOGY OF THE ALEYRODIDiE. 11 
foot, which has the paronychium represented by a spine as in that 
genus. 
In Neomaslcellia comata Maskell (PL I, fig. 12, and PI. XXXIV) 
we find the greatest reduction in the family. Here the costa and sub- 
costa are united, and in the body of the wing only one vein, the radial 
sector, remains. (It should be noted here that Maskell's figure of 
this species is wrong. Our drawings were made from his type and 
the small vein he figures does not exist.) It is evident, then, from 
the venation that comata forms the type of a new genus. This is also 
indicated by the hairy psyllid-like claspers. 
The species Dialeurodicus cockerellii (Quaintance) (PI. I, fig. 5; 
PI. IV, fig. 3) shows the same wing venation as Aleurodicus, but 
the type of vertex and the absence of compound pores immediately 
place it elsewhere. 
In this connection should be mentioned an article by Sophie 
Rostrup 16 which : since it is apparently followed by Dr. Max Wolff, 
deserves some notice. As the communication is short we quote it 
entire : 
Aleuroclider er en lille nied Skjoldlus og Bladlopper naerbeslaegtet Familie 
af smaa, m011ignende Dyr. Ved et Bes0g af mig i Ringsted i August 190S 
indsamlede Landbrugskandidat, Gaardejer Pallesen, Kaerehave, Blade af 
Guler0dder, angrebue af Krusesyge, paa hvis Underside der fandtes en Del 
smaa Dyr, om hvilke Hr. Pallesen nieddelte mig, at ban ofte havde set dem 
paa saadanne Blade. Ved naermere Unders0gelse viste de sig at h0re til 
ovennaevnte Familie. Imidlertid fandtes der ingen udviklede Insekter, kun 
Larver og Nymfer ; saa vidt det kan afg0res ef ter dette Udviklingsstadium, synes 
de at b0re til Slaegten Aleurodicus, der bidtil ikke bar vaeret kendt fra Evropa. 
Larver og Nymfer er forsynede med et tint Voksovertraek og sidder ubevaegeligt 
ined deres lange, tynde Snabel indboret i Plantevaevet og suger af dette. 
Sp0rgsmaalet, om disse Dyrs Sugning staar i Forbindelse med Krusesygen og 
i saa Tilfaelde, bvilken Del de bar i denne, kan paa naervaerende Tidspunki 
ikke afg0res. Professor Kplpin Ravn mener oftere at nave bemaerket disse 
Dyr paa Gulerod. 
It is evident by examining the figures that the specimens referred 
to do not represent a species of Aleurodicus, but belong to the Psyl- 
lidae and are very likely near Trioza. The pulvillus of the foot, the 
general form, the marginal wax fringe, the wing venation, the lack 
of vasiform orifice, in fact, all the characters noticeable in these fig- 
ures are those of the Psyllidse and not of the Aleyrodidse. Any ideas, 
therefore, based on the venation in these figures must be discarded. 
31 ALE GENITAL ORGANS. 
In male Aleyrodida? the abdomen ends in a heavily chitinized collar 
on the dorsal surface of which is found the vasiform orifice and from 
the extremity of which protrude the claspers and the copulatory or- 
gan. It does not seem impossible that this last segment represents 
01201 °— 13 2 
