Tech Series 27, Bureau of Entomology, U. S. Dept. of Agriculture. 



C Sc 



Plate I. 



C^5 



M,.z 7 



Q'^i^AC-A^ 



3t4 



Mlt^ ® 



/ 



C Sc 



Hs 9 



A Cx 



C + 'Sc 



Wing Venation in the Aleyrodid/e. 



Fig. 1 .— Theoret ical origin of the veins of the psyllid genus Trioza. showing tracheae. Fig. 

 2.— Forewing of Trioza sp. Fig. 3.— Theoret ieal origin of the veins of Aleyro(iida\ show- 

 ing trachea^. Fig. 4. — Forewing of Udamosdis pignunlaria. Fig. 5. — Forewing of Z>ia- 

 hurodicus cocJienlli. Fig. 0.— Forewing of Ahurodicus cnnspurcatus. Fig. 7.— Fore- 

 wing of AhuTodicun d(structor. Fig. 8.— Forewing of Alairndictis (Mctakurodicus) 

 minimus. Fig. 9.— Forewing ofPara/(j/ro(/<«/j(r«(a;. Fig. 10.— Forewing of Akurochiton 

 aari.i. Fig. 11.— Forewing of Aki/rodessp. Fig. 12.— Forewing of XtomaskcUia comala. 

 (Original.) 



