mann: ants of the hkitish solomon islands. 383 



Described from a unique worker. 



This species is near P. scutulatiis F. Smith, from Aru. It agrees 

 with Smith's description except that the epinotum of Icaipi is not 

 opaque, but shining. Emery has described and figured (Rev. Suisse 

 zool., 1893, 1, p. 226, fig. 7-8) a New Guinea specimen that he con- 

 siders scutidatus. In his figure of the head, the frontal carinae are 

 broadly curved at sides, the thorax is distinctly broader than the 

 head; the mesonotum is not distinctly separated from the epinotum 

 and is more than twice as broad as long; in kaipi the frontal carinae 

 are narrowly curved, the thorax is barely broader than the head and 

 the mesonotum is less than twice as broad as long. The epinotal 

 and petiolar spines of kaipi, as well as the humeral spines are very 

 much longer than in scutuJatus. Polyrhachis nurita Emery, also closely 

 related, has the thorax proportionally very much broader, and is 

 differently sculptured with the epinotal declivity and posterior surface 

 of petiole striate, instead of smooth as in kaipi. 



117. Polyrhachis (Myrmatopa) ulysses Forel. 

 Rev. Suisse zool., 1910, 18, p. 91, g . 



Female. Length 10 mm. 



Ocelli very small. Mesonotum convexly declivous at anterior third; 

 posterior two thirds slightly convex and narrowly and very feebly margined 

 at sides. Scutellum transversely oval. Prescutellum with weakly margined 



Fig. 53. — Polyrhachis (Myrmatopa) ulysses Forel. Petiole from front. 



anterior border. Base of epinotum thinly margined at sides, the margins 

 lacking the anterior angulate structure found in the worker, spines more 

 slender than in the worker. Petiole similar to that of worker. Wings (length 

 9.5 mm.) clear, veins and pterostigma brown. 



