1892.] 15 



(J scale is white, tricarinated, with the larval skin projecting beyond the an- 

 terior margin, and in all respects like that of a Diaspis. Length, about "8 mm. 



Prof. Comstock found this species on orange trees in Louisiana 

 and Cuba, and liis figure and description enable me witbout difficulty 

 to determine my specimens, which were sent to me by Mr. Douglas 

 on a piece of the bark of orange tree sent from Demerara to Mr. 

 Mclntire. This piece of bark was very thickly populated, especially 

 with male scales, which gave a completely white appearance to the 

 bark, similar to that presented on the rose tree by males of the Diaspis 

 rosce. It does not appear to be a European species. 



2. Chioi^aspis biclayis. 



Chionaspis ? biclavis, Comst., Kept., 1883, p. 98, 'No. 74i. 

 ? scale more or less circular, and appears to be of a pale brown colour, bub 

 Prof. Comstock (op. cit.) observes that " the colour of the scale is white, but this 

 colour is almost invariably obscured by the layer of vegetable tissue beneath which 

 the scale is, and which adheres closely to the scale." The scale is about 2 mm. in 

 diameter. The adult female shows, besides the head, six distinct segments, besides 

 the quasi-pygidium, whicli in this species appears to consist of four rudimentary 

 segments. The 2nd, 3rd, and 4lh, or thoracic, segments have no lateral plates, 

 merely a small spine to each, the 5th, 6th, and 7th have each five or six simple mar- 

 ginal plates. The posterior margin has four lobes on each side of the median line, 

 the first or median lobes are large, with obtuse apex and serrated margin, diverging 

 anterioi'ly, and converging posteriorly ; the 2nd lobe is double, but small and rudi- 

 mentary, the 3rd lobe is also double and larger than the 2nd, whilst the 4th is 

 sometimes larger than the 3rd and also double, although sometimes the 4th lobe 

 is not very conspicuous, merely a serrated indentation of the margin. There are 

 tAvo minute plates between the median lobes, either two or three comparatively large 

 ones between 1st and 2nd lobes, two or three between 2nd and 3rd lobes, and three 

 between 3rd and 4th lobes. A stout spine is observed adjacent to the base of each 

 lobe, with the exception of the median lobes, where the spine is very small. There 

 are rows of simple csecal spinning glands, extending anteriorly, and antei'ior to the 

 base of the median lobes are two club-shaped processes, which appear to be tubular 

 spinning glands within the body, and which form a characteristic feature of this 

 species. There are no grouped ventral glands. The anus is large, and situated just 

 below the seventh somital line. 



The (^ scale has not yet been found, so this species has only been 

 placed provisionally by Comstock in the genus Chionaspis. That 

 author mentions having found it in the conservatories of the Depart- 

 ment of Agriculture on several plants, viz. : Diospyrus ehenuin, Ficus 

 laurifolia, a species of Tamarindus, Ochrus sapota, and Etoecarpus 

 cijanus. My specimens were taken from Anona muricata, from Eoy. 

 Bot. Gardens, Kew, sent to me by Mr. Douglas. The popular name 

 of " the mining scale " has been given to this species by Prof. Com- 



