480 bulletin: museum of comparative zoology. 



Host (Temporary). F. sehaufussi var. incerta. 



Type locality. — Connecticut: Colebrook, (Wheeler). 



Massachusetts: Woods Hole, Ellisville, Forest Hills, Blue Hills 

 (Wheeler). 



The habits of this variety are very similar to those of the typical 

 form. Its young colonies are not infrequently found mixed with 

 F. incerta and, as I have shown in former papers, the recently impreg- 

 nated ciueens establish their formicaries with the aid of this species. 

 The characters which separate consocians from the typical form are 

 very slight and refer mostly to the pilosity. I believe, however, that 

 they will prove to be valid. The variety is evidently a more boreal 

 form of the species. 



65. F. MORSEi Wheeler. 

 F. morsei Wheeler, Psyche, 1906, 13, p. 39, fig. ^ . 



Worker. Length 3.5-5.5 mm. 



Mandibles 8-tootbed. Palpi rather long. Head, excluding the 

 mandibles, distinctly longer than broad; cheeks long, slightly flattened 

 converging in front; posterior border and angles convex and rounded. 

 Clypeus convex, carinate, with rounded anterior border. Antennae 

 slender; four basal joints of funiculi longer and more slender than the 

 penultimate joints. Thorax in profile with deep mesoepinotal con- 

 striction, convex pro- and mesonotum and the epinotum with distinct 

 base and declivity, the former convex and rounded, the latter flattened 

 and sloping. Petiole narrow, its anterior and posterior surfaces alike 

 convex in profile, its border rather blunt; seen from behind the border 

 is broadly rounded, in some specimens faintly excised on the middle, 

 but not produced upward. Gaster large. Legs rather long. 



Mandibles subopaque, coarsely striatopunctate. Anterior portion 

 of head, clypeus, frontal area, lower surface of thorax, and gaster 

 smooth and shining; remainder of body subopaque, very finely 

 shagreened ; upper surface of gaster with a slightly oily luster. 



Hairs white, short, obtuse, suberect, and very sparse on the upper 

 surface of the head, thorax, and gaster; nearly always absent on the 

 gula and petiolar border. Femora and tibiae naked, the latter with a 

 row of tapering hairs on their flexor surfaces. Pubescence white, 

 extremely short and sparse, so that it is almost invisible, except on the 

 upper surface of the gaster. 



Reddish yellow; borders of mandibles black; anterior border of 

 clypeus, vertex, upper surface of pro- and mesonotum, femora, tibiae, 

 apical antennal joints, and gaster more or less infuscated; anal region 



