1920] Mann: Ant Guests 67 



sides roundly margined. Antennae distinctly longer than head. First 

 joint smaller than the second, second joint transverse broader than 

 basal portion of third. Third joint thick, markedly enlarged at 'apical 

 third, circular and truncate at apex. Prothorax broad basally, narrowed 

 in front, with nearly straight sides. Elytra together much broader than 

 long, sides feebly arcuate, posterior comers narrowly rounded, the 

 posterior margin truncate at sides and deeply concave at middle. 

 Abdomen broad, the basal fovea extremely deep, grooved at bottom; 

 dorsal surface posterior to pit strongly concave; lateral swellings large, 

 deeply excavated and bearing extremely thin fasicula; side margins 

 acute at anterior third, less so behind. Ventral surface of metathorax 

 broadly rounded. First abdominal segment much longer than the fol- 

 lowing three segments together. Legs slender, the middle femora with 

 short spines which are thick basally, narrowed apically, strongly curved 

 and about one-third as long as tibiae. 



Yellow brown, shining, thorax and abdomen sparsely, regularly 

 punctate. Head in front of eyes sparsely, rather coarsely punctate, 

 posteriorly with strong, elongated and confluent foveolate punctures. 

 Hairs yellow, coarse, strongly curved and moderately abundant on 

 antennge. 



Host: Pheidole knowlesi var. extensus Mann. 



Described froin a unique male taken at Nadarivatu, Viti 

 Levu, Fiji. 



The broad, oval form, the shape of the head, the thickly 

 margined inferior sides of the neck and the exceedingly profound 

 abdominal pit are very distinctive. 



Kaisia gen. nov. 



'Note. — Kaisi (Fijian) = slave. 



Form elongate. Head longer than broad. Eyes well developed. 

 Antennae four-jointed, the first joint very small, the third longer than 

 the fourth which is truncate apically. Prothorax broad, strongly 

 impressed at base. Elytra elongate. Abdomen small, with a deep, 

 narrow pit in front and well developed lateral swellings and fasiculae. 

 Metastemum with a pair of broad foveae which are separated by a 

 longitudinal ridge of pubescence; apical margin with a pair of strong 

 vertical spines. Type oceanica. 



Kaisia oceanica sp. nov. 



(Fig. 2, e; Fig. 8.) 



Male: Length 1 mm. 



Reddish brown. Hairs rather strong and sub-erect, regularly 

 arranged and moderately abundant on head, pronotum elytra and 

 abdomen. Fasiculae of abdomen well developed, dense. Head less than 

 twice as long as broad, as broad in front as behind, widest behind eyes, 

 not impressed above; rugosely punctate. Eyes large and convex, sit- 



