384 



bulletin: museum of comparative zoology. 



Florida: Tulagi, Maliali. 



A handsome species, conspicuous because of the white tips to the 

 antennae. It is much less common than the following related species. 



118. PoLYRHACHis (Myrmatopa) osae, sp. nov. 



Worker. Length 6.75-7.5 mm. 



Head in structure very similar to that of ulysses. Pronotum convex; humeri 

 with indistinct denticulae. Mesonotum margined at sides, the margins 

 elevated into broad, subtriangular lobes; surface concave between lobes, 

 behind declivous to the mesoepinotal suture. Epinotum bluntly margined 



Fig. 54. — Polyrhachis (Myrmatopa) osae Mann. Worker. 



at sides ; margins somewhat elevated, but not angulate in 

 front, spines short and triangular; declivity sloping, much 

 longer than base, with rather flat surface. Petiole as in 

 campbelH but the spines shorter and less divergent (their 

 distance at tips about equal to their length). 



Gaster very shining, the rest moderately shining except 

 the head, which is nearly opaque. Mandibles punctate 

 and striolate. Clypeus shallowly, cribrately punctate, ex- 

 cept for a space near the base. Head rugulosely punctate. 

 Thorax, epinotum, and petiole shallowly punctate and 

 reticulate, the petiole more coarsely than the rest. An- 

 tennae and legs finely striolate, punctate. 



Short, erect hairs present on funiculus and very fine 

 and short appressed ones on clypeus and gaster and a pair 

 of erect setae on sides of basal portion of clypeus. 



Black. Mandibles and legs obscurely rufous last six 

 joints of antennae pale yellow-brown. 



Feviale. 



Length 8 mm. 



Fig. 55. — Polyrha- 

 chis (Myrmatopa) 



osae Mann. Head as m worker. Ocelli small. Mesothorax slightly 



Worker. convex abovc) rounded at sides, with distinct parapsidal 



