34 PROCEEDINGS OF THE NATIONAL MUSEUM, VOL. 62. 
ICERYA PURCHASI Maskell. 
Reference—Fernald Cat. Cocce. World, 1903, p. 25-27. 
The Maskell collection contains slides of this species as follows: 
One of ‘‘females, 3rd stage beginning to form sac, March, 1878” (two 
adult females); one of ‘“‘female, early in 3rd stage, March, 1878”’ 
(one adult female); one of ‘young insect from acacia, March, 1878”’; 
one of ‘male, 1888.’”’ The unmounted material is in three lots all 
bearing No. 95, none of which is definitely recognizable as part of the 
material on which Maskell based his original description. 
In view of the widespread distribution, the characteristic superficial 
appearance, the numerous figures and descriptions in literature, and 
the degree of familiarity which the economic importance of this insect 
has developed in every entomologist, it has not been considered 
necessary to prepare an extended redescription of it. 
In addition to the characteristic appearance of the ovisac and 
body secretions, and the size and shape of the mature female, the 
combination of morphological characters possessed by the species, 
including the presence of only two pairs of abdominal spiracles, the 
presence of large pores serceting glassy filaments, and the presence 
of the numerous, conspicuously blackish, long, hair-like setae dorsally, 
and in rather distinct clusters along the body margin, seems quite 
sufficient to distinguish this species from any other known to belong 
in the same genus, with the single exception of koebelei, and the dif- 
ferences between these two species have already been discussed. 
Subfamily MARGARODINAE. 
PLATYCOELOSTOMA, new genus.? 
Coccids of the Margarodine series as at present recognized; adult 
female of medium size, elongate oval, convex, segmentation visible, 
secreting a quantity of cottony matter at the time of oviposition; 
antennae placed rather close together at apex of body, 10-segmented, 
tapering gradually from base to apex, the apical longest and slightly 
stouter; legs of good size and rather short, not unusual for the 
group, each face of trochanter with several pores; beak wanting 
(Maskell); with two pairs of thoracic and seven pairs of abdominal 
spiracles (inferred); derm pores of one sort only, multilocular disk, 
thin walled, with usually three to five central loculi, encircled by a 
band of numerous small, half-oval loculi; derm setae of one sort only, 
rather small, slender setae set in flat, inconspicuous, circular collars; 
anal opening simple (Maskell); ventral cicatrices not known. Inter- 
mediate stage female occurring in waxy cells beneath bark; oval, 
flattened; with antennae reduced to mere stubs and legs to flat 
patches of pores and setae; beak small, 2-segmented; with two pairs 
8’ New genera should be credited to the senior author only. 
