198 
Psyche 
[Vol. 89 
The colony was kept alive for four subsequent brood periods in 
artificially shortened annual cycles (Buschinger et al., 1975), and 
produced (besides alates and workers of the black “ muscorum ”) a 
total of 56 males, 5 females and 1 worker of the small species. From 
a second colony that was established with one of the young females, 
I got an additional 4 males, 2 females, and one worker. This new, 
apparently parasitic species will now be described. 
2. Description of Leptothorax faberi n. sp. 
Figs. 1-5 
Holotype female: total length 3.45 mm, head length 0.67 (exclud- 
ing mandibles), head width 0.59 (behind eyes), scape length 0.49, 
greatest diameter of eye 0. 16, thorax length 0.98, thorax width 0.58, 
length of petiole in lateral view 0.27, width of petiole 0.22, length of 
postpetiole 0.20, width of postpetiole 0.32, length of forewing 2.89, 
hind wing 1.90, length of hind femur 0.58, hind tibia 0.46. The end 
of the gaster is somewhat curved down so that its length (1.3mm) 
cannot be determined with precision. 
Paratype females (selected measures of two females): total length 
3.2/3.47 mm, head length 0.68/0.79 mm, thorax length 0.97/1.18 
mm, thorax width 0.50/0.66 mm. 
Habitus in general similar to the queens of the genus Leptothorax, 
subgenus Leptothorax sensu Smith (1950) ( —Mychothorax Ruzsky). 
Mandibles with 5 or 6 teeth of normal size; one or two tiny teeth 
may be present between the normal ones in the middle of the masti- 
catory border. Maxillary palps 5-segmented, labial palps 3-seg- 
mented. Antennae 1 1-jointed with a 3-jointed club. Anterior border 
of clypeus with a feeble notch (fig. la). Three ocelli present. Thorax 
(fig. lb) as in Leptothorax muscorum. Epinotal spines of moderate 
size, acute; epinotal spine index (Buschinger, 1966) between 1.5 and 
1.8. Wings as in L. muscorum (fig. 2). Petiole (fig. lb) not peduncu- 
lated; viewed from above, the outline is nearly quadrate, with a 
slight convexity of the sides. In lateral view the anterior face is 
slightly concave, the posterior face distinctly so. The summit is flat, 
descending backward and forming a right angle with the anterior 
face, and an obtuse angle with the posterior one. A conspicuous 
ventral spine forms the anterior end of a ventral, concave, triangular 
field, the sharp, ventrolateral edges of which diverge towards the 
postpetiole. 
