58 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol.60 



COCCUS that probabljT' no other species originalh'^ inchided in that 

 genus are really congeneric with the type, as ^fhaerococcus is at 

 present isolated on the basis of the presence of legs in the second 

 stage of the female. 



The following generic diagnosis is based on the preceding de- 

 scription. 



GENERIC DIAGNOSIS OF CHAETOCOCCUS. 



Modified Pseudococcine forms living parth^ surrounded by secre- 

 tion in protected situations on the host; adult female large, oval, 

 tapering, and somewhat pointed behind, flattened, heavily chitinized 

 at maturity, antennae reduced to tiny tubercles, legs wanting, men- 

 turn indistinctly 2-segm.ented, dorsal ostioles obscure, no cerarii de- 

 veloped, body with spines, particularlj'^ posteriorly, and with multi- 

 locular disk pores, triangular pores, and tubular ducts, with a pore 

 plate behind each hind spiracle, anal ring with pores, placed at 

 inner end of invaginated tube, and with six setae protruding some- 

 what; larva elongate, parallel-sided, antennae 6-segmented, the apical 

 long, legs normal, derm with longitudinal rows of trilocular pores 

 and small slender setae, no definite cerarii, at least posterior dorsal 

 ostioles present, with a pair of apical setae but no evident anal lobes, 

 anal ring with pores and six slender setae. 



This genus very obviously belongs with the group of modified 

 Pseudococcine forms of which Antonma is the oldest described genus, 

 and which also includes Sphaerococcug and possibly other, mis- 

 placed, genera. The writers consider Chaetococcus to be doubtfully 

 distinct from Aiitoniva, as this latter genus is commonly understood, 

 the only apparent difference occurring in the very heavy thickening 

 of the derm which developes all over the body of Chaetococcus at 

 maturity, instead of merely on the posterior abdominal segments as 

 in Antonifia. 



Genus KUWANINA Cockerell. 



Genotype. — Sjjhaerococcus parvus Maskell. 



References.— Fe^vndildi, Cat. Cocc. World, 1903, p. 121.— Green, Ent. 

 Month. Mag., vol. 51, 1915, p. 181.— Ferris, Can. Ent., vol. 50, Oct. 

 1918, p. 324. 



This genus was established by Cockerell in the Fernald Catalogue 

 on the basis of the larval characteristics only, and with a single 

 included species. One other species, Sphaerococcus ohscuratus 

 Maskell has recently been added to the genus by Ferris, but the 

 writers have had no opportunity to study satisfactory^ material of 

 this last species, and in view of the doubt expressed at the time of 

 its reassignment, have decided to confine the generic diagnosis which 

 follows to the type species. 



