410 bulletin: museum of comparative zoology. 



region and narrowest in the mesothoracic region, humeri rounded. Epinotal 

 declivity flat, submargined laterally. Petiole a little narrower than epinotuin, 

 scarcely broader than long, sides scarcely convex, in profile higher tlian long, 

 rounded above and behind, flat in front, with a stout tooth anteroventrally. 

 Postpetiole a little broader than long and somewhat narrowed in front. Basal 

 gastric segment very long, twice as long as broad and nearly five times the 

 length of the other segments together. Pygidium smaU, its surface impressed, 

 its border strongly denticulate. 



Subopaque. Mandibles with coarse punctures and fine striae. Head, 

 thorax, and abdomen covered with moderately coarse punctures and rugulose 

 between them, the gaster less coarsely so than the rest. 



Fine, silky, yellow erect pubescence uniformly abundant throughout. 



Reddish brown. 



Female. Length 5.25 mm., apterous. 



Head proportionately shorter than in worker. Eyes small and flat, situated 

 well in middle of front of sides of head. Ocelli well developed. Thorax very 

 similar to that of worker. Petiole as broad as epinotum, more than twice as 

 broad as long and depressed at the middle of dorsal surface, with anterior 

 angles subgibbous; in profile distinctly higher than long, armed anteroven- 

 trally with a stout tooth. Postpetiole very large, nearly twice as long as the 

 petiole and very much broader, with the dorsal surface distinctly and broadly 

 impressed at middle. Gaster long and slender; first segment twice as long as 

 broad, as broad in front as behind, with subparallel sides. 



Less rugose than worker. Thorax covered with irregular and unevenly 

 distributed punctures, and more shining than in the worker. 



Color as in worker. 



Viti Levu: Nadarivatu. 



The specimens are from a large colony found beneath a big stone 

 after a heavy rain. A small pocket in the earth, about an inch and a 

 half in diameter and two thirds of an inch deep, was packed with larvae 

 and adults, but no pupae w^ere present. 



The single female is pale in color, and I should consider it a callow 

 were not all of the large series of workers in the same colony similarly 

 colored. It dift'ers from the worker strikingly in the structure of the 

 petiole and postpetiole but the thorax is similar in structure in both 

 phases. Type. — M. C. Z. 8,683. 



3a. Cerapachys (Syscia) cryptus Mann, subsp. fusctor, subsp. nov. 



Worker. Length 4 mm. 



Differing from cryptus in sculpture. The petiole and postpetiole are much 

 more coarsely and deeply punctate and the punctures of the gaster larger and 

 deeper and more regular. 



