AHT. 12. MASKELi. GENERA OF COCCTDAE — MORRISOlsr. 7 



shown to have been placed on the basis of an antenna having two 

 terminal segments broken off, giving the appearance of 6-segmented 

 antennae, when in reality eight were originally present, and it has in 

 consequence been removed to Drosicha} 



Subfamily Margarodinae. 

 Genus COELOSTOMIDIA Cockerell. 



Plate 1, fig. 2. 



Genotype. — Coelostoma zealandica Maskell. 



Reference.— FQvii?i\di, Cat. Cocc. World, 1903, p. 30. 



C oelostomidia is a new name proposed by Professor Cockerell as a 

 substitute for Coelostoma Maskell, the latter genus being preoccupied. 

 The genus was first established under the latter name by Maskell in 

 1880 with the single inlcluded species C. zealandicum, which therefore 

 stands as the type. 



This species is at present represented in the Maskell collection by 

 seven slides, one of " young insects from Muhlenbeckia, Dec. 1879," 

 one of " under side of female, 3d stage from Muhlenbeckia, Feb. 4, 

 1880," one of " female 2d stage from Muhlenbeckia Feb. 7, 1880," one 

 of " female 2d stage 1889," one of " antenna of female, Apr. 1890," 

 one of " adult female, 1891," and one of " intermediate stage of male, 

 1891," and by a number of unmounted specimens, including males, 

 females, and a number of the tests of immature stages, all of the lat- 

 ter bearing the Maskell No. 98. 



If the statement of the published original description to the effect 

 that it was read June 5, 1879, is correct, none of these specimens can 

 be considered as true type specimens of the species, but it does seem 

 quite probable that the specimens on slides dated 1879-80 represent 

 individuals from the same colony as those on which Maskell based 

 his original description, and consequently will be satisfactory for 

 redescriptive purposes. 



Adult female. — Elongate oval, broadest behind the middle; an- 

 tennae 11-segmented, stout, tapering, the intermediate segments wider 

 than long ; legs normally developed, stout ; mouthparts wanting ; with 

 two pairs of thoracic and seven pairs of large tubular abdominal 

 spiracles, the later without the pore collar found in the intermediate 

 stage, the posterior pair placed behind and at some distance from the 

 anal ring ; derm thin and transparent, the setae relatively much more 

 numerous than the pores, in contrast to the condition in the second 

 stage, with only the multilocular disk type of pore present, and these 

 of only one sort, with a chitinized outer band, a circle of numerous 

 loculi, and a cluster of unequally developed central loculi ; derm setae 



• See Philippine Journ. Sci., vol. 17, 1920, p. 157. 



