Tech Series 27, Bureau of Entomology, U. S. Dept. of Agriculture. 
C Sc 
Plate I. 
Wing Venation in the Aleyrodid/e. 
Fig. 1.— Theoretical origin of the veins of the psyllid genus Trioza, showing tracheae. Fig. 
2.— Forewing of Trioza sp. Fig. 3.— Theoretical origin of the veins of Aleyrodidae, show- 
ing trachea?. Fig. 4. — Forewing of Udamoselis pigmcntaria. Fig. 5. — Forewing of Dia- 
hurodicus cockereUi. Fig. 6. — Forewing of Alcurodicus conspurcatus. Fig. 7. — Fore- 
wing of Alcurodicus destructor. Fig. 8. — Forewing of Akurodicus (MetaUurodicus) 
minimus. Fig. 9. — Forewing of Paralcyrodcs persex. Fig. 10.— Forewing of Akurochiton 
aceris. Fig. 11.— Forewing of Akyrodcs sp. Fig. 12.— Forewing of Xeomaskdlia comata. 
(Original.) 
