1922] On some Trophobiotic Cocciclce from British Guiana 135 
bromelise” of Bouche rests on a very unstable basis clue to the 
ambiguity of the original description. As a matter of fact, it 
appears to be entirely impossible to determine positively what 
species was described by Bouche under this name, and our 
present notion of the species really dates from Signoret’s recles- 
cription in 1875. As Prof. Cockerell suggests, his “Dactylopius 
brevipes” described from Jamaica on pineapple is identical with 
the species at present recognized as P. bromelice, but as Pseudo- 
coccus brevipes has never attained any standing among coccid 
workers, while several at present recognize and identify a certain 
mealybug as P. bromelice, the writer has preferred to retain the 
older name regardless of the uncertainty as to what was actually 
described by Bouche, at least until his species is clearly shown to 
be something other than the one at present given the name 
bromelice. 
Pseudococcus rotundus sp. nov. 
Occuring in cavities in stems of the host, attended by ants. 
Adult Female . — All specimens available preserved in 
liquid, so nothing regarding normal external appearance can 
be given; maximum length as mounted 3 mm., maximum width 
2.75 mm., specimens in preservative proportionately somewhat 
more elongate, flattened beneath but strongly convex above; 
derm clearing completely on treating with potassium hydroxide, 
except for the appendages and the ventral chitinized areas; 
antennae normally 8-segmented, not unusual, the range of 
measurements in microns of segments in four individuals as 
follows: I, 72-79; II, 68-79; III, 54-64; IV, 36-46; V. 46-54; 
VI, 43-57; VII, 50-54; VIII, 107-114; legs normal, stout, hind 
femur and tibia with numerous tiny pores, those on femur 
frequently clustered, digitules probably normal, but all injured, 
claw stout, without denticle; beak elongate triangular, with a 
narrow basal collar and two much larger, distinct segments; with 
the usual two pairs of dorsal ostioles; normally with 17 pairs of 
cerarii each composed of spines with accessory seta? and a cluster 
