22 
Psyche 
[March 
Key to Arnoldidris species, based on workers 
1. Each occipital lobe drawn out into a long, dorsally 
curved, tapered spine horvathi (Szabo) 
Occipital lobes rounded or bluntly angulate, not drawn 
out into acute teeth or spines 2. 
2. Propodeal spines and petiole long, but not extremely 
so, about 3/4 as long as the greatest width of the 
gaster; color (of type worker) yellow, with blackish 
alitrunk and nodes chyzeri (Emery) 
Propodeal spines and petiole extremely long, about as 
long as the gaster is wide ; color not as above, the head 
and alitrunk usually darker than the gaster 3. 
3. As seen from directly above (full-face view of head), 
the occipital lobes terminate each in a blunted angle 
4. 
As seen from directly above (full-face view of head), 
the occipital lobes each end in an evenly rounded full 
curve 5. 
4. Head and alitrunk brownish-red, gaster yellow .... 
biroi (Szabo) 
Head and alitrunk predominantly black or piceous, 
gaster brownish-yellow 
longispinosus (Donisthorpe) 
5. Color of head and alitrunk rich medium brownish-red, 
gaster yellow; coarse punctures on occiput restricted 
to the immediate zone along the posterior excision 
szentivanyi Brown 
Color of head and alitrunk predominantly black or 
piceous, gaster brownish-yellow; coarse punctures or 
foveolae widely distributed and conspicuous over oc- 
cipital lobes The speci- 
men from Wisselmeren, discussed under A. szentivanyi. 
Orectognathus antennatus Fr. Smith 
Specimens have been received from an additional Aus- 
tralian locality, the collection by Father C. Mercovich: 
Calga, New South Wales. These specimens average a little 
smaller than samples previously found : minimum HL 
1.31 mm.; Cl 75-76, mi 64-65. 
