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Several phragmotic species in the ant genus    Carebara    Westwood, 1840 with a cephalic shield are known from the Old World, but species with an anteriorly truncated head seem to be unknown until now. A new species, resembling the phragmotic workers of the ant genus    Colobopsis   , is here described as    Carebara   colobopsis    Hosoishi &amp; Yamane,  sp. nov. , based on major and minor worker found in Cambodia. This new species is similar to    Carebara   acutispina    (Xu) and    C.   obtusidenta    (Xu) in some important characters, but distinguished from the latter two by distinct metanotum and deep groove in front of metanotal disc in the major worker, and longer head and deep metanotal groove in the minor worker. This is the first confirmed record of a truncated phragmotic head in the major worker of the genus    Carebara   . We propose the    Carebara   acutispina    species group to include all the three species, present a diagnosis of this group, and provide a key to species based on the major and minor worker castes.

Discovery of a new phragmotic species of the ant genus Carebara Westwood, 1840 ( Hymenoptera , Formicidae ) from Cambodia