1920.] 127 



from 3-13 (avcrag-c 7). In tlie lower sories the median proup contains 

 from 3-8 pores (averag-e o), the anterior laterals V2-2J (average 17), the 

 lower laterals 17-34 (average 24). Length 1-1*5 mm. 



On Gaidtlieria deirvessa and G. ^'tqjestris, Edinburgh Botanic 

 Gardens. 



I am informed by Mr. W. Evans, through whom the specimens 

 were submitted to me, that the infested Gaultheria plants were i-aised 

 from seed received from New Zealand eight ^^ears ago, and are growing 

 under glass without, however, any artificial heat. The temperature in 

 the house was frequently well below the freezing-point during the 



Fig. 6. — Poliaspis gauUheriae. a, anterior spiracle, X 450 ; 

 b, pygidium of adult, X 220. 



previous winter (1918-19). The fact that the plants are of New 

 Zealand origin is of interest, as Australasia appears to be the head- 

 quarters of the genus Poliaspis, six out of the nine recorded species 

 having been described from either Australia or New Zealand. Of the 

 three remaining species, one occurs in Natal, another inhabits Japan, 

 while the third {cycadis) has been observed only in conservatories in 

 the United States and England. But the fact that these Oaultheria 

 plants were raised from seed precludes any possibilit}' that the new 

 species was introduced with this particular host. 



In general characters P. gaultheriae is most closely allied to argen- 

 tosis of Brittin and cycadis of Comstock. In fact. Prof. Newstead, to 



