TRIBE ASPIDIOTINI 447 



b. Pygidium with median pair of lobes quadrangular, concave at 

 distal end; second pair of lobes as broad at distal end as at proxi- 

 mal; densariae of second incisurae with mesal margin about twice 

 as long as lateral. — Kansas on Andropogon, Panicum, Chrysopo- 

 gon. marlatti Parr. 



bb. Pygidium with median pair of lobes quadrangular, lateral mar- 

 gin longest, concave; second pair of lobes as broad as median, 

 similar in shape; third pair of lobes similar in form, much 

 smaller; second and third incisurae with densariae, mesal margin 

 longer than lateral; dorsal oraceratubae numerous, arranged in 

 three rows; anus about seven times its width from caudal margin 

 and about twice from vulva. — Chrysomphalus tonilensis Ckll., 

 Chrysomphalus covilleae Ferris. — New Mexico, Arizona on Yucca, 

 Bigelowia, Covillea. yuccarum Ckll. 



aa. Pygidium with median pair of lobes never concave at distal end. 



b. Pygidium with median pair of lobes quadrangular, bluntly rounded, 

 entire; second and third pairs of lobes similar in form, subequal 

 in size, all about as broad at distal as at proximal end; meso- 

 spiracerores 6; segments of preabdomen with numerous large 

 dorsal oraceratubae. — Australia on Casuarina castmrinae Mask. 



bb. Pygidium with median pair of lobes adjacent, longer than wide, 

 mesal and lateral notches; second pair of lobes narrower, sides 

 nearly straight, large lateral notch; third pair of lobes small, 

 bluntly pointed; median and second incisurae narrow, lobes 

 adjacent third incisurae broad; plates or pectinae wanting; me- 

 dian setae inconspicuous, others prominent; second incisurae ap- 

 parently with thickenings. — Australia on Dryandra 



dryandrae Fuller. 



SPECIES OF PYGIDIASPIS 

 Pygidium of adult female with median and second pairs of lobes similar, 

 broad, short, three or more times as broad as long, distal margin 

 obscurely notched on each side and slightly projecting between notches, 

 placed close together, with long thickened broad paraphysis-like pro- 

 jections extending cephalad from proximal ends; each lateris with 

 three broad projections, similar in form to lobes, broader, distal margin 

 faintly crenulate, without paraphysis-like projections, cephalic one of 

 each side smallest, distance between it and median one twice that be 

 tween caudal and median; conspicuous translucent curved channel 

 extending cephalad for distance equal to width of lobes; anus minute, 

 located between channels. — Australia on cedar logs cedri Green. 



SPECIES OF TARGIONIA 

 a. Pygidium with strong tooth-like projections on each lateris. 



b. Pygidium with tooth-like projections of lateres arranged in pairs. 



c. Pygidium with median pair of lobes with distal end bluntly 

 rounded, quadrangular, distant, not converging, faint mesal 

 and prominent lateral notches; setae small. — France, Italy, 

 Algiers on Vitis vitis Sign. 



