202 
Psyche 
[Vol. 89 
b 
a 
d 
1mm 
0,5 mm 
Fig. 3. Epinotum and petioles of males, and male genitalia (subgenital plate, 
volsella with lacinia, and sagitta) of Leptothorax. a,b, L. faberi n.sp.; c,d, its host 
species, “L. muscorum " , large black form; e,f, “L. muscorum”, small brown form. 
The shapes of the sagitta and volsella with lacinia vary considerably in all 3 species. 
Allotype worker: total length 3.02 mm, head length 0.66 (exclud- 
ing mandibles), head width 0.58, scape length 0.46, greatest diame- 
ter of eye 0.16, thorax length 0.91, width 0.43, length of petiole 0.24, 
width 0.20, length of postpetiole 0.17, width 0.30, length of hind 
femur 0.51, hind tibia 0.42, length of gaster approximately 1.05 mm. 
Habitus similar to an ordinary worker of L. muscorum, but 
somewhat more stout and clumsy (fig. 4). Mandibles with 6-7 teeth, 
palps with 5 and 3 joints, as in the female. Eyes of moderate size, 
ocelli absent, anterior border of clypeus with a notch as in the 
female. Thorax with a deep meso-epinotal suture, and the pro- 
mesonotal suture clearly visible. Pronotum comparatively wide. 
Epinotal spines as in the female, epinotal spine index 1.6. Petiole 
and postpetiole as in the female, as well as the appendages. Head 
and whole body coarse and rugulose except for the gaster, which is 
