44 [ February. 



not, then Harrisii ; yet as there is uncertainty about the former, and 

 the latter name is inappropriate, I apprehend it will be most con- 

 venient to maintain the name D. ostrewformis. 



I may mention that the female Diaspls ostreceformis when alive is 

 red, with yellow abdominal regions. Having been described and 

 figured by Comstock, it is unnecessary for me to give any particulars. 

 It does not appear to have been found yet in the British Isles. It has 

 been found in California, as mentioned by Comstock, whilst Signoret 

 has found it in France, and I have found it common on pear trees in 

 Portugal. Maskell does not mention it as having been found in New 

 Zealand, although his Diaspis santali, found on pear, plum, &c., would 

 not appear to be very dissimilar, if it were not for the absence of the 

 grouped glands. 



2. Diaspis Boisduvalii. 



Uiaspis Boisduvalii, Signoret (1868), Ess. s. Coch., p. 114, pi. v, figs. 1 and 2 ; 

 Comstock (1883), 2nd Eep. Corn. Un. Exp. Stn., p. 86, fig. 9; Maskell (1887), New- 

 Zeal., Scale Ins., p. 46, pi. iv, fig. 5. 



This species, discovered by Signoret on orchids in the Luxembourg conserra- 

 tories, is artistically figured by him, and Comstock's descriptions and figures render 

 it easy of recognition. I have found both ^ and ? scales on orchid leaf received 

 from Mr. Douglas. Comstock found it on Ravetiala madagascariensis and Livis- 

 fonia, in conservatories ; and Maskell finds it on hothouse plants and on wattle 

 in gai'dens in Wellington. 



3. Diaspis EOSiE, Bouche. 



The synonyms and references to authors have all been given by Mr. Douglas 

 (Ent. Mo. Mag., xxiv, p. 23), and Comstock has furnished full description and 

 figures. 



My specimens I took from a mango leaf received by Mr. Mclntire from 

 Demerara, and sent on to me by Mr. Douglas. I have not yet found the species in 

 Portugal ; and from Mr. Douglas' extract (I. c.) from a letter from Mr. Parfitt, of 

 Exeter, it appears to be uncommon in England. Comstock says it is common on 

 roses in the States, and Maskell found it on rose trees in New Zealand ; whilst 

 Boisduval and Signoret both mention it as common on roses. 



4. Diaspis zami.^;, n. sp. 



? scale circular, very convex, white, farinose, frequently with fluted sides. 

 Diameter, about 1'8 mm. Exuviae lateral. First larval skin naked, within the 

 marginal limits of the second, but placed anteriorly. Second skin elliptical. 



$ adult, about, 9 mm. diameter. No grouped ventral glands. Median dorsal 

 lobes large, divergent posteriorly, with inner lateral margins serrated. Opposite to 

 the bases of the dorsal lobes, a pair of small ventral lobes, with pointed apex. Three 

 duplex lobes on each side of the median pair, and beyond these the margin is 

 dentate. A pair of coecal spinning glands will be found close to the margin, anterior 



