Maskell. — On Coccidida?. 9 



■without some interest. What is the object of these apterous 

 individuals ? In most cases it would appear that theii- organs, 

 excepting the wings, are fully developed : in Eriococcus 

 hohericB there seems to be something wanting, but its gene- 

 rative organs are apparently perfect. Leachia zealandica and 

 Gossyparia ulmi exhibit very small rudimentary wings, which 

 must be quite useless for flight. I have included both in the 

 following list, wliich gives all the apterous males that I know 

 of at present ; also Lecanium hcsperidunt, although I have not 

 yet been able to procure the full text of M. Moniez's paper, 

 and have only gathered fi-om a summary of it that the male is 

 never winged. 



Species. References. 



A. Sometimes totally apterous : 



Aspidiotns (?) sabalis, Comst. . . Comstock, 2nd Cornell University 



Report, 1SS3, p. 67. 

 Chionasjpis saJicis, Linn. . . Bouche, Stett. lint. Zeit., 1884, p. 



294. 

 Low, Wiener Ent. Zeit., U., 1883. 

 Chionasins fraxini, Signoret E. Newstead, in lit. 



( = C. salicis ?) 

 Chionaspis aim, Sign. . . R. Newstead, in lit. 



Chionasjyis dysoxyli, Mask. . , Maskell, X.Z. Trans., vol. xxii., 



p. 13G 

 Leiicaspis pusiUa , IjOW .. Low, Wiener Ent. Zeit., II., 1883. 



Lecanium liesi^eridiim . . Moniez, Comptes Rendus de I'Acad. 



des Sciences, Feb., 1887. 

 Eriococcus {Acanthococcus) ace- Low, Wiener Ent. Zeit., II., 1883. 



ris. Sign. 

 Eriococcus liohcria:. Mask. . . The present paper. 



B. Sometimes with rudimentary wings : 



Gossyparia ulmi, Geoffrey .. Signoret, Essai, p. 320. 



Howard, " Insect Life," Aug., 1889. 

 Ieachiazealandica,'^l3is'k. .. The present paper. 



As regards the time of the year at wliich these apterous 

 males emerge, I find that it varies considerably. Mr. New- 

 stead tells me that C. saJicis and C. aini came out in England 

 in July (summer) ; Mr. Howard states that G. idmi appeared 

 about the 1st May at Washington (spring) ; here in New 

 Zealand E. holicrice appeared in May (autumn), C. dysoxyli 

 from February to August (autumn and winter), and L. zea- 

 landica in October (spring). Om* winter in this country is, of 

 course, not nearly as severe as that of England or Northern 

 America. But, so far, I have not met with any apterous 

 males in our summer season. 



Genus Poliaspis, Maskell. 



Scale-Ins. of N.Z., p. 56; N.Z. Trans., vol. xiv., p. 293. 



I venture to put in a few considerations in favour of the 

 retention of Poliaspis as a separate genus. Professor Comstock, 

 in liis Second Report of the Cornell University Department of 



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