1915] Mann--Southern Ant from Naushon Island 51

A NEW FORM OF A SOUTHERN ANT FROM NAUSHONISLAND, MASSACHUSETTS.

BY WM. V[. MANN,Bussey Institution, Harvard University.

In August, 1915, Mr. F. X. Williams and I spent part of a daycollecting on Naushon Island, opposite Woods Hole, Mass.Among other insects characteristic of more southern regions wefound several colonies of a large Aphenogaster, which were nestingbeneath large stones on the tops of low hills near the shore. Thisproves to be an undescribed subspecies of Aphcenogaster treatceForel, a species which, with its variety ashmeadi Emery, is foundthroughout the South Atlantic states and as far north as Connec-ticut. This occurrence on Naushon Island is an addition to thelong list of insects and plants typical of the southern coastalregion which occur also at isolated points on the north coast, asrelicts of the ancient costal plain fauna and flora.The subspecies may be characterized as follows:

Aphaenogaster treate Forel subsp, wheeleri nov.

Worker: Similar to treatce in form, sculp-ture and pilosity, but differs in having thelamelle at the base of antennal scapes broadlyangulate in front, instead of evenly rounded.The color is much darker, being dark fuscois,with the front of head and the gastric dorsumpiceous.

Female: Differing from treate in thefollowing characters. The color is darkfuscous to piceous. The antennal lamelleare very noticeably angulate in front. Theepinotal spines are longer and less broadat the base. The wings are more deeplyinfuscated.

Fig. 1. Aphaenogaster treateForel. a, antennal lamella ofsubsp, wheeleri, nov.; b, same oftreatae 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 ofthe typical treate from various localities.

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