214 



G. F. FERRIS. 



Pinnaspis simplex, sp. n. (fig. 3). 



From undetermined host, Foochow, China. 



Scale of the female 1-5 mm. long, elongate, narrow, dark brown. Scale of the 

 male not observed. 



Female 0-9 mm. long, of the usual elongate form, the derm membranous throughout 

 except for the pygidium. Margins of the abdominal segments projecting but little, 

 without gland spines or at the most with a single gland spine on the last segment 

 anterior to the pygidium, with numerous marginal ducts. Dorsum without ducts. 

 Anterior spiracles with a small group of pores. Pygidium (fig. 3) acutely pointed, 

 the median lobes alone developed, apparently fused, their outer edges crenulate. 

 Extending into the pygidium from the median lobes is a slender, elongate median 

 thickening. Beyond the median lobes there is first a small prominence followed 

 by two .setae, one of which has a conspicuously chitinised socket, a gland spine, two 

 submarginal pores, a seta, a submarginal pore, two gland spines and a submarginal 

 pore. Dorsum of the pygidium withoiit pores except for the marginal series and a 

 single pore representing the front row. Anal opening close to the anterior margin 

 of the pygidium. Circumgenital pores in five groups. 



Fig. 3. Pinnaspis simplex, sp. n. : pygidium and portion of pygidial margin. 



Notes. — Specimens of this species have been examined by Mr. E. E. Green, who 

 agrees with me that it is undescribed. It is characterised by the single pair of lobes 

 and is quite distinct from any other species known to me. I may note that I am 

 considering the genera Pinnaspis and Hemichionaspis as synonymous. 



Pinnaspis minor (Maskell). 



On undetermined host, Taihoku, Formosa. 



Parlatoria pergandei (Ckll.). 



On palm (?), Foochow, China, and on Thea sinensis and undetermined host at 

 Taihoku, Formosa. 



Parlatoria zizyphi (Lucas). 



On Citrus sp., Taihoku, Formosa. 



