MORPHOLOGY OF THE ALEYEODIDiE. 11 



foot, which has the paronychium represented by a spine as in that 

 genus. 



In NeomaskeUla comata Maskell (PI. 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 

 Eostrup ^° which^ since it is apparently followed by Dr. Max AYolff, 

 deserves some notice. As the communication is short we quote it 

 entire: 



Alcurodidcr er en lille med Skjoldlus og Bladlopper naerbeslaegtet Familie 

 af sruaa, m011ignende Dyr. Ved et Bes0g af mig i Ringsted i August 190S 

 indsanilede Landbrugskandidat, Gaardejer Pallesen, Kaerelia^e, Blade af 

 Guler0dder, angrebue af Krusesyge, paa hvis Underside der fandtes en Del 

 smaa Dyr, oni hviike Hr. Pallesen meddelte mig, at ban ofte havde set dem 

 paa saadanne Blade. Ved naermere Unders0gelse viste de sig at li0re til 

 ovennaevnte Familie. Imidlertid fandtes der ingen udviklode Insekter, kim 

 Larver og Nymfer ; saa vidt det kan afg0resefterdetteUdviklingsstadium, sj-nes 

 de at h0re til Slaegten Aleurodicus, der bidtil ikke bar vaeret kendt fra Evropa. 

 Larver og Nymfer er forsynede med et fint Voksovertraek og sidder ubevaegeligt 

 med deres lange, tynde Snabel indboret i Plantevaevet og suger af dette. 

 Sp0rgsmaalet, om disse Dyrs Suguiug staar i Forbindelse med Krusesygeu og 

 i saa Tilfaelde, hvilken Del de bar i denne, kan paa naervaerende Tidspunki 

 ikke afg0res. Professor K0lpin Ravn mener oftere at bare bemaerket disse 

 Dyr paa Gnlerod. 



It is evident by examining the figures that the specimens referred 

 to do not represent a species of Aleurodicus, but belong to the Psvl- 

 lidiip and are very likely near Trloza. 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 Ps3dlid8e and not of the Aleyrodidaj. Any ideas, 

 therefore, based on the venation in these figures must be discarded. 



MALE 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 

 G12or— 13 2 



