TRIBE DIASPIDINI 321 



e. Pygidium with second pair of lobes represented by long 

 bluntly pointed projections; median pair of lobes distant, 

 strongly divergent, mesal margins serrate, caudal end 

 projecting far beyond caudal margin, lateral margin free 

 and entire; third pair of lobes wanting or represented 

 by two low rounded protuberances; pointed projection 

 between median and second lobe probably latadentis; 

 plates shown arranged 0, 0, 1, 1; anus located distinctly 

 caudad of vulva; genacerores 10-10(20-20)9-9. Mexico on 



Prosopis. townsendi Ckll. 



ee. Pygidium with second pair of lobes subround, each rather 

 less than one-half width and length of median lobe, dis- 

 tant by about its own width from median lobe; median 

 pair of lobes largest, almost imperceptibly excavated on 

 distal portion of lateral margin, very slightly notched on 

 distal portion of mesal margin; third pair of lobes about 

 one-half size of second pair, appearing as tubercles on 

 margin, each distant from second lobe rather more than 

 twice its width; with projections identified as fourth and 

 fifth pairs of lobes; plates not large, not long, equaling 

 in length median pair of lobes; anus distant from vulva; 



genacerores 15-15(30-30)20-20. Mexico on Baccharis 



baccharidis Towns. & Ckll. 



dd. Pygidium with second pair of lobes always deeply incised. 

 e. Pygidium with one plate in each second incisura, each 

 side with eight plates, 

 f. Pygidium with one plate in each third incisura. 



g. Pygidium with five marginal, one mesal, and two 

 submarginal oraceratubae of altaceratubae on each 

 side; median pair of lobes with lateral margins not 

 free, mesal margins serrate, oblique; second and 

 third pairs of lobes subequal, incised, entire, distal 

 ends of lobelets broadly rounded; plates short, ar- 

 ranged 0, 1, 1, 6, those of each lateris distant, ar- 

 ranged l-( 1-1) -1-1-1, cephalic plates much broader 

 than caudal; marginal oraceratubae of altaceratubae 

 located in latadentes, two latadentes on each lateris, 

 located between groups of plates; genacerores 

 8-10(14-20)13-17. Europe, eastern United States, 

 California, Mexico on Bromelia, Hibiscus, Canna, 



Bilbergia, Olea,, pineapple, ivy bromeliae Kern. 



gg. Pygidium with three or four marginal and sub- 

 marginal rows of oraceratubae of altaceratubae on 

 each side, two caudal longitudinally elongate and 

 three cephalic small and round; median pair of 

 lobes distant, oblique, mesal margin long and con- 

 vex, with five distinct serrations including caudal 

 one, lateral margin with single serration; second 

 pair of lobes very small and low, incised; third pair 

 of lobes low, broad, trifid, similar to three mar- 



