1922] On some Trophobiotic Coccidce from British Guiana 141 
Immature stages. — None available for examination. 
This species has been described from three specimens having 
the following collection data according to Dr. Wheeler’s notes: 
“No. 247. Kartabo, B. G. July 23, 1920. The coccids 
were in the hollow bases of the leaf-petioles of a Tachigalia 
pamculata Aublet with a black species of Azteca ( Azteca foveiceps 
Wheeler.)” 
The types are in the U. S. National Collection of Coccidae. 
Ripersia subcorticis sp nov. 
Occuring under the bark of the host, attended by ants. 
Adult Female— Preserved in fluid, so nothing regarding 
the normal external appearance can be given; color of alcoholic 
specimens ranging from yellow brown to dull purple, but usually 
with a purple tinge; stout oval, flattened beneath, fairly convex 
above, average length of mounted specimens 2 mm., width 
1.5 mm; clearing completely, except for appendages, on treating 
with potassium hydroxide; antennae not unusual, normally 7- 
segmented, but frequently with six, the range of measurements 
in microns of those available for examination as follows: 1, 
47-54; II, 39-50; III, 25-35; IV, 22-32; (III and IV where 
combined, 57-61), V, 22-29; VI, 28-32; VIII, 71-82; legs normal, 
the claw without denticle, the hind coxa, but not the femur and 
tibia, with a number of pores; beak elongate triangular, with 
an obscure basal collar and two distinct segments; with the 
usual two pairs of dorsal ostioles; cerarii, as such, not distinctly 
developed, but with loose marginal or ventral submarginal 
clusters of slender, conical to slightly lanceolate spines, ac- 
companied by a closer grouping of the small triangular pores, 
these clusters distinctly isolated on the posterior abdominal 
segments, but forming an almost continuous but inconspicuous 
band around the anterior margin of the body; anal lobes barely 
indicated, the apical seta immediately adjacent to the posterior 
cluster of spines, length not certain, probably about one and a 
half times that of the anal ring setsc, without any trace of ventral 
chitinous thickenings; derm dorsally with only the small tri- 
