320 THE COCCIDAE 



distant; oraceratubae of lataceratubae located in lata- 

 dentes; brevaceratubae small and numerous; anus lo- 

 cated nearly midway between vulva and caudal margin, 

 nearer vulva; mesospiracerores about 6. Diaspis 

 echinocacti Bouche, Diaspis echinocacti cacti Comst., 

 Diaspis echinocacti opuntiae Ckll. Europe, northern 

 Africa, India, eastern United States, New Mexico, 

 Arizona, Mexico, West Indies, Brazil on Opuntia, 

 Echinocactus, Cereus. calyptroides Costa. 



ff. Pygidium with genacerores arranged 11-11(10-10)3-4; 

 median pair of lobes close together, low, evenly round- 

 ed, entire; second and third pairs of lobes represented 

 by extremely small, colorless, pointed prominences; 

 plates large, two on each side especially large and 

 broad with fimbriated ends, pectinae; anus distant from 

 vulva; latadentes bearing oraceratubae at proximal 

 ends of lobes, closely adjacent pair beneath median pair 

 of lobes, and three or four other pairs at intervals along 

 margin. Mexico on mistletoe phoradendri Ckll. 



ee. Pygidium with lateral margin of median pair of lobes 

 and margin of mesal lobelet of second pair serrate; me- 

 dian pair of lobes with mesal margins straight, entire, 

 lateral margins feebly rounded, oblique, only small por- 

 tion free, finely serrate; second pair of lobes incised, 

 mesal lobelet broader than long, strongly rounded, very 

 finely serrate, lateral lobelet elongate, rounded, rudimen- 

 tary; third pair of lobes incised, mesal lobelet large, 

 unsymmetrical, straight inner and oblique outer mar- 

 gins, lateral lobelet similar, small, rudimentary; plates 

 of second and third incisurae only slightly longer 

 than lobes, others larger, arranged 0, 1, 1, 6, those of each 

 lateris arranged 1-2-3, distal portion of plates suddenly 

 reduced in size; genacerores 10-20(14-19)8-9. Syria on 

 Pistacia. syriaca Lindgr. 



dd. Pygidium with furcapectinae in second and third incisurae; 

 median pair of lobes wide apart, large, mesal margins oblique, 

 entire or slightly crenulate, lateral margins only partly 

 free; second pair of lobes incised, short; third pair of lobes 

 incised; latadentis cephalad of each second and third lobe 

 and two caudad of third lobe; plates and pectinae arranged 

 0, 1, 1, 22, those of each lateris arranged 2-3 and others 

 uniformly distributed cone-like plates, furcapectinae adja- 

 cent to each third lobe and about twenty plates cephalad of fur- 

 capectinae; caudal segment of preabdomen with twenty-two 

 plates on each side; oraceratubae numerous; mesospira- 

 cerores and metaspiracerores 20-25; genacerores 15-28(17-45) 

 17-32. Brazil on Myrtaceae australis Hemp. 



cc. Pygidium with median pair of lobes with mesal margins serrate, 

 d. Pygidium with second pair of lobes not incised. 



