1922] On some Trophobiotic Coccidce from British Guiana 141 



Immature staged. — 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 

 panicidata Aublet with a black species of Azteca {Azteca foveiceps 

 Wheeler.)" 



The t3^pes are in the U. S. National Collection of Coccidse. 



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; antenna? not unusual, normally 7- 

 segmented, but frequently with six, the range of measurements 

 in microns of those available for examination as follows: I, 

 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 distinctlj^ isolated on the posterior abdominal 

 segments, but forming an almost continuous but inconspicuous 

 band around the anterior margin of the bod}^; 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 seta?, without an}' trace of ventral 

 chitinous thickenings; derm dorsally with only the small tri- 



