1922] On some Trophohiotic Coccidce from British Guiana 135 



bromelise" of Bouche rests on a very unstable basis due 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 redes- 

 cription in 1875. As Prof. Cockerell suggests, his ''Dactylopius 

 hrevipes'^ described from Jamaica on pineapple is identical with 

 the species at present recognized as P. hromeliai, but as Pseudo- 

 coccus hrevipes has never attained any standing among coccid 

 workers, while several at present recognize and identify a certain 

 mealybug as P. hromelice, 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., speciinens 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 



