1979] 
Brown — New Species of Proceratium 
343 
strongly inflated nor produced caudad .,. 2 
Petiolar node low and bun-shaped, or at least broad at base, with 
anterior and posterior faces strongly coverging to a rounded 
apex; second gastric segment strongly vaulted, inflated, and 
produced caudad behind the anteroventrally-protrusible true 
apical segments . 3 
2. Size larger, head width >0.75 mm (SE U.S.) . croceum 
Size smaller, head width <0.75 mm (L. Ontario and Massachu¬ 
setts s. to Florida and Honduras) . silaceum 
3. Apical segments and sting issuing from near anteroventral end of 
second gastric segment, so that the sternum of this segment is 
very short—as seen from the side, not or scarcely more than half 
as long as sternum of preceding (postpetiolar) segment ... 4 
Apical gastric segments issuing from second gastric segment 
nearer to its posterior end, so that its sternum as seen from the 
side is subequal in length to that of the preceding segment 
(California) . californicum 
4. Larger species; head width without eyes >0.80 mm; anterior 
clypeal border produced as a median lobe that is emarginate 
apically. 5 
Smaller species; head width without eyes <0.80 mm; anterior 
median lobe of clypeus absent or reduced to a small, rounded or 
single-pointed tooth . 6 
5. Very large species; head width >1.0 mm; petiole longer than 
deep, and slightly longer than broad in worker (Central America) 
. goliath 
Medium-sized species; head width without eyes <1.0 mm; petiole 
about as high as long, and broader than long (forested E. USA 
north to Massachusetts) . pergandei 
6. Trunk in side view with dorsal outline evenly convex from pro- 
notum to top of propodeal declivity (Mexico to Ecuador, Cuba) 
. micrommatum 
Trunk in side view with propodeal dorsum feebly concave in 
outline, then raised as a rounded angle or boss where it meets the 
declivity (SE Brasil) . brasiliense 
Proceratium numidicum in Europe 
Baroni Urbani (1977) calls into question my 1958 identification of 
Proceratium numidicum from Tirana, Albania, saying that “appar- 
