TRIBE DIASPIDINI 365 



very small; cuticle with numerous oraceratubae ; mesogenacerores 

 about 11; anus distinct, fair distance from caudal margin, cuticle 



around anus strongly concentrically striate. Mexico on oak 



parvula Ckll. 



fob. Pygidium of adult female with four lobe-like projections; median 

 pair of lobes near together, broader than long, broadly rounded, 

 entire; second pair of lobes incised, mesal lobelet largest, mar- 

 gins rounded, entire; dorsal oraceratubae numerous, small, irreg- 

 ularly arranged; anus large, about fourteen times its width 

 cephalad of caudal margin and about once cephalad of vulva; 

 setae minute; pygidium of second nymphal female with four 

 minute distant subequal lobes, distance between lobes about 

 three times width of lobe; setae few and minute; anus prominent, 

 about five times its width from caudal margin; plates wanting. 



Arizona on Quercus. pulchra Ferris. 



aa. Pygidium without lobes or lobe-like projections. 



b. Pygidium as broad as or broader than long, margin broadly 



rounded, not pointed. 



c. Pygidium with margin coarsely irregularly crenulate, without 

 lobes or plates; setae four in number, moderate in length; 

 anus located distant from caudal margin, around anus a num- 

 ber of conspicuous thin spots in cuticle, appearing as perfora- 

 tions; pygidium of second nymphal female with three plates 

 on each side; spiracerores wanting; surface of body finely 



carinate. South Africa on Euclea im'bricata Brain. 



cc. Pygidium with margin entire, smooth, broadly rounded, bear- 

 ing four minute distant setae; anus small, about eighteen times 

 its width from caudal margin and four times caudad of vulva. 

 Resembles species of Gymnaspis or Aonidia. Arizona on 



Acacia. edentata Ferris. 



fob. Pygidium longer than broad, distal portion pointed, never broad- 

 ly rounded; body of adult female more or less globose; pygidium 

 flattened, cordate, acuminate; lobes and plates wanting; margin 

 with two irregular teeth-like projections at caudal end; anus 

 small, near cephalic end, twenty or more times its width from 

 caudal margin; setae minute, one on each side near cephalic end 

 of margin, few on disk; many linear thickenings radiating in- 

 wards from margin; pygidium of second nymphal female broad, 

 rounded, hinged, semicircular plate; setae, lobes, plates, wanting; 



similar to preceding species. Australia on Acacia 



anomala Green. 



SPECIES OF NUDACHASPIS 



Insects forming galls upon leaves and stem of host-plant, external open- 

 ing to gall typically closed by first exuvia, second exuvia thin, enclos- 

 ing adult puparium-like in early adult, ruptured later and insect ex- 

 truded; body of insect "comma-shaped," enlarged cephalic portion bent 

 at right angles to caudal portion; pygidium of adult female without 

 lobes, plates, or setae; with seven serrate lobe-like projections on each 

 side, probably pseudolobes, projections disappear with age; altacera- 



