W. M. Mann.
A New Form of a Southern Ant from Naushon Island, Massachusetts.
Psyche 22:51, 1915.

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19151 Mann-Southern Ant from Nuus-hon Island 5 1 A NEW FORM OF A SOUTHERN ANT FROM NAUSHON ISLAND, MASSACHUSETTS.
BY WM. M. MANN,
Bussey Institution, Harvard University.
In August, 1915, Mr. F. X. Williams and I spent part of a day collecting on Naushon Island, opposite Woods Hole, Mass. Among other insects characteristic of more southern regions we found several colonies of a large Aphsenogaster, which were nesting beneath large stones on the tops of low hills near the shore. This proves to be an undescribed subspecies of Aphcenogaster treats Forel, a species which, with its variety ashmeadi Emery, is found throughout the South Atlantic states and as far north as Connec- ticut. This occurrence on Naushon Island is an addition to the long list of insects and plants typical of the southern coastal region which occur also at isolated points on the north coast, as relicts of the ancient costal plain fauna and flora. The subspecies may be characterized as follows: Aphaenogaster treatae Fore1 subsp. wheeleri nov. Worlcer: Similar to treats in form, sculp- ture and pilosity, but differs in having the lamellae at the base of antennal scapes broadly angulate in front, instead of evenly rounded. The color is much darker, being dark fuscous, with the front of head and the gastric dorsum piceous.
Female: Differing from treats in the
following characters. The color is dark
fuscous to piceous. The antennal lamella? are very noticeably angulate in front. The epinotal spines are longer and less broad at the base. The wings are more deeply
infuscated.
\
Fig. 1. Aphaenogaster treats
Forel. a, antennal lamella of
subsp. wheeleri, mv.; b, same of
treats Forel.
Described from two females and numerous workers. The darker coloration is very noticeable and constant in a large series of the new subspecies, compared with many specimens of the typical treatce from various localities.



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