TRIBE ASPIDIOTINI 409 



cc. Pygidium without pectinae or plates on lateres. 



d. Pygidium with an oblique row of oraceratubae extending 

 cephalad from each third incisura, laterad of this another 

 row of irregularly alternate pores and none from second in- 

 cisurae; median pair of lobes subquadrangular, with small 

 mesal and large lateral notch, rounded; second pair of lobes 

 small, broader than long, lateral margin oblique, notched; 

 third pair of lobes similar to second, wider; median incisura 

 with spine-like plates, each second incisura with two plates 

 or two furcapectinae or finely lacinate unapectinae or one 

 plate and one furcapectina; setae only slightly longer than 



lobes; genacerores 0-4(8-14)5-11. — Europe on oak 



zonata Frauenf, 

 dd. Pygidium with oblique row of oraceratubae extending cephal- 

 ad from each third incisura, cephalad of this another row of 

 irregularly arranged pores and a row of about five oracera- 

 tubae from each second incisura. 



e. Pygidium with genacerores arranged 0-8(10-14)8-11; me- 

 dian pair of lobes subquadrangular, large lateral notch or 

 sinuate, rounded; second pair of lobes small, longer than 

 broad, lateral margin oblique, two lateral notches; third 

 pair of lobes minute, bluntly pointed; pectinae short, those 

 of median and second incisura not longer than lobes, furca- 

 pectinae, arranged 2, 2, 3, 0, those of each third incisura 

 unapectinae; setae very long, much longer than lobes; 

 genacerores 0-8(10-14)8-11. — Aspidiotus juglandis Colvee, 

 Aspidiotus juglans-regiae albus Ckll., Aspidiotus juglans- 

 regiae kafkae Ckll. — United States east of Rockies, Canada, 

 New Mexico, California, Switzerland, Spain on walnut, 

 apricot, apple, pear, peach, cherry, plum, locust, maple, 



etc. juglans-regiae Comst. 



ee. Pygidium with genacerores arranged 0-1(6-7)5-7; four 

 series or rows of oraceratubae. — New Mexico on plum, 

 Liquidambar. juglans-regiae pruni Ckll. 



SPECIES OF QUADRASPIDIOTUS 



a. Pygidium with six or more pectinae on each lateris. 



b. Pygidium with two caudal pectinae of each lateris longer than 

 cephalic pectinae. 



c. Pygidium with six pectinae on each lateris, three caudal much 

 larger than three cephalic, pectinae forming a scaly fringe in 

 region of lobes; median pair of lobes largest, not contiguous; 

 anus large, about twice its own length from caudal margin; 

 genacerores (4-8)5-5. — Arizona, Mexico on ash. townsendi Ckll. 



cc. Pygidium with pectinae long, scarcely lacinate or dentate, four 

 caudal pectinae of each lateris much larger than three cephalic; 

 median pair of lobes large, prominent, adjacent, not touching, 

 obliquely truncate, distinct lateral and faint mesal notches; 

 second pair of lobes small, broad, mesal angle longest; mesal 



