10 PROCEEDINGS OF THE NATIONAL. MUSEUM. tol. 60. 



slender setae, each set in a collar ; anal tube distinctly chitinized, the 

 end with a double collar of pores ; apex of abdomen with a single pair 

 of long differentiated setae, these perhaps a fourth the length of 

 the body; with three rather large, circular, ventral cicatrices, the 

 median slightly larger than the laterals. 



Cotype.—Cdii. No. 24755, U. S. N. M. 



Besides the slides already listed the Maskell collection contains 

 one other, marked " from E. Eaithby, Reefton, 1891," an adult 

 female which appears to be identical with the adults of C. zealandi- 

 cum^ except that it has a small thickening or tubercle between the 

 anterior legs that strongly resembles a much reduced mentum. That 

 this might easily be such a structure is shown by some recently pub- 

 lished observations on the variability in the extent of the development 

 of the mouth parts in certain related species. 



Of the four other species left in this genus, according to the 

 arrangement in the Fernald Catalogue, C. assimilis (Maskell) has 

 been made the type of a subgenus, and will be discussed next. C. 

 ivairoensis (Maskell) is known only from the male, and a com- 

 parison of this male with that of the type indicates that its assign- 

 ment to the genus is questionable, particularly in view of the great 

 increase in the number of the tarsal digitules, as many as 24 being 

 present on each tarsus, according to Maskell. An examination of 

 the type slides of C. coTnpressa (Maskell) shows that its placing in 

 this genus is likewise questionable; the larval antennae are 7-seg- 

 mented and of a different type from those of G. zealandica; the 

 multilocular disk pores of the immature stages are of a very different 

 sort from any found in the genotype ; the anal tube is wanting in the 

 intermediate stage of the female, and the antennae of the adult 

 female are 10-segmented, to mention some of the more conspicuous 

 differences. A similar uncertainty is evident with regard to the 

 remaining species, G. pilosam, and the following generic diagnosis 

 has therefore been limited quite closely to the characters exhibited 

 by the type species of the genus. 



GENERIC DIAGNOSIS OF COELOSTOMIDIA. 



Coccids of the Monophelbine-Margarodine series; adult female 

 elongate oval, secreting a mass of cottony substance at oviposition, 

 antennae stout, 11-segmented ; legs normal; mouth parts wanting; 

 with two pairs of differentiated thoracic and seven pairs of large 

 simple abdominal spiracles; derm with a single type of multilocular 

 disk pore and two types of slender setae, all abundant; anal tube 

 short, simple; ventral cicatrices wanting; intermediate stage female 

 globular, enclosed in a heavy protective cell ; antennae and legs much 

 reduced; mouth parts present and functional; with seven pairs of 



