TRIBE DIASPIDINI 329 



of each lateris arranged 2-2-5or6; anus 

 located near middle of length of pregena- 

 cerores ; genacerores 13-13 ( 24-25 ) 16-22. 

 California on orange.-.sassceri Ckll. & Robs. 



kk. Pygidium with brevaceratubae with first 

 row wanting, second row with one group, 

 mesal 2-6, third row with two groups, lat- 

 eral 5-9 and mesal 4-9, fourth row in two 

 groups, lateral 3-9 and mesal 3-8; median 

 pair of lobes as broad as long, serrate, dis- 

 tal end bluntly rounded; second and third 

 pairs of lobes incised, mesal lobelet much 

 larger than lateral, serrate; plates long, 

 slender, arranged 0, 1, 1-2, 5-11, those of 

 each lateris arranged Ior2-lor2-3or7, usually 

 with two plates in each third incisura 

 and with two on each lateris adjacent to 

 third lobe; anus located about its own 

 width cephalad of vulva; genacerores 11-23 

 (21-44) 18-33. Europe on Salix, Populus, 

 Alnus, Cornus, Acer, Vaccinium, Tilia, 



Sorbus, Fraxinus, Sarcolthamnus 



solids Linn. 



ff. Pygidium with two to three plates on cephalic part of 

 each lateris. 



g. Pygidium with median pair of lobes with mesal mar- 

 gins divergent from proximal end, lobes large, 

 broadly bluntly rounded, serrate; second pair of 

 lobes incised, lobelets broadly bluntly rounded, 

 mesal lobelet more than twice as long as lateral, 

 margins serrate; third pair of lobes incised, mesal 

 lobelet much longer than lateral, oblique, lateral 

 lobelet inconspicuous, margins serrate; plates long 

 and stout, arranged 0, 1, 2, 4-7, those of each lateris 

 arranged Ior2-lor2-2or3, cepahalic plates longer 

 than caudal; dorsal oraceratubae arranged in rows; 

 genacerores 10-16(20-24)10-17. Texas on cotton wood. 



longiloba Cooley. 



gg. Pygidium with median pair of lobes with mesal mar- 

 gins contiguous on proximal half and divergent on 

 distal half, large, prominent, distal and lateral mar- 

 gins broadly rounded, crenulate; second and third 

 pairs of lobes incised, lobelets wedge-shaped, broad 

 end directed distad, mesal lobelets larger than lateral, 

 margins crenulate; plates of incisurae only slightly 

 longer than lobes, arranged 0, 1, 1, 4-5, those of each 

 lateris arranged l-l-2or3 ; anus its own width caudad of 

 vulva; dorsal oraceratubae arranged in rows; alta- 

 ceratubae six on each side; genacerores 8-18(15-20)8- 

 18. Ceylon on Elaeagnus. elaeagni Green. 



