1922] On some Trophohiofic Coccidce from British Guiana 139 



triangular pores, ventrally with these pores less numerous, but 

 also uniformly distributed, except at and near the body margin, 

 where they are closely crowded, with numerous large circular 

 multilocular disk pores in a heavy collar around the genital 

 opening and in transverse bands on three segments anterior to 

 genital collar, and quinquelocular disk pores of approximately 

 the same size as the genital pores in numbers at the spiracles; 

 no other pore sorts located; dorsally and ventrally with numbers 

 of scattered, slender, faintly lanceolate setae; with a single large 

 quadrate n^edian ventral cicatrix posterior to the hind legs. 



PreaduU female. — In general resembling the adult quite 

 closeh', differing in the smaller size, the 7-segmented antenme, 

 the smaller and less developed spiracles, the reduced numbers of 

 spines, seta? and pores in the cerarii and the very great reduction 

 in the number of ventral disk pores. 



No other stages have been available for examination. 



This species has been described from four mounted and a 

 few iinmounted specimens received from Dr. Wheeler with the 

 following note: 



"In the cavities of the stems of Triplaris surinamensis 

 Chanc. with Pseudomyrma sp. nov. (allied to Ps. triylaridis 

 Forel.)" 



The types are in the U. S. National Collection of Coccidre. 



GENUS RI PERSIA SIGN OR ET 



This genus is at present merely a convenient dumping 

 ground for those species of mealybugs having the number of 

 antennal segments reduced and the cerarii usuallj' much reduced 

 in number or even wanting. Until the genera of the true mealy- 

 bugs are based on an adequate morphological foundation, little 

 else can be done with apparently new species than to place them 

 in some such convenient genus as this one, and it is on this 

 basis that the two species described below have been assigned 

 to a position here. 



