ooo 



-^- PROCEEDINGS OF THE ACADExMY OF [Feb. 



thirds formed by the first segment. Wings milky or yellowish hyaline, 

 with very pale and indistinct veins and stigma. Radial cell sometimes 

 open, sometimes closed. There is a single cubital cell. Transverse 

 vein meeting cubital vein at its bifurcation; internal cubital often 

 indistinct. Discal cell closed. The pilosity of the female is usually 

 less pronounced than that of the worker, though of the same character; 

 the sculpturing is rougher. 



Male.—Oi the same size as the worker, or but httle larger, and 

 usually darker in color. Head short and as broad or broader than the 

 thorax. Mandibles variable, narrow, truncate and toothless, or den- 

 tate or denticulate. Clypeus somewhat convex. Antenna 12-13- 

 jointed; scape short, funiculus very long, slightly thickened at its 

 distal end to form, in many cases, an indistinct 4-jointed club. Eyes 

 and ocelli large and prominent. Mayriaii furrows of mesonotum very 

 distinct. Epinotum not prolonged backward, with two small swell- 

 ings, rarely with two short teeth, in the place of the worker armature. 

 Petiole more slender and with lower node than in the worker. Post- 

 petiole nodiform or subcampanulate. Gaster rather slender, elongate 

 elliptical, often shghtly flattened dorsoventrally. Legs' slender. 

 Wings as in the female. Hairs on the body and appendages usually 

 much less conspicuous than in the worker, not clavate. 



I subjoin a table for the identification of the workers of the various 

 Leptothorax species known to occur in America north of Mexico. As 

 the females of only half and the males of less than half of our species 

 are known, it is hardly worth while to construct tables for the identifi- 

 cation of the winged sexes. ^ 



6 The following species have been described from Mexico and Central America 

 and m all probability comprise but a very small portion of, the species actually 

 occurring in these countries: f ^ ^^ ciLtudiiy 



1. Leptothorax Stolli Forel, Bull. Soc. Vaud. Sci. Nat. (2), XX p 3.5'^ 1894 



fm^,'lltl899!75?'-$'^"""'P'-''^"' '^^''' P- '""' ForeX^BfolT'Celtr: 



Guatemala, summit of crater of the Volcan de Agua (13 000 feet')- Uvino- 



imdersrones. ' ^^' "'"» 



2. L. echinatinodis Forel, Compt. Rend. Soc. Ent. Bek XXX IS^ifi n vlviii 



^ ; Biol. Centr. Am., Ill, 1899, p. 5.5. ^" ' ' ^^ "' 



Rio Janeiro, Brazil. Lives in hollow twigs. The t>T)ical form has not been 



it°s variS America, but only the foUo^-ing subspecies and possibly 



Subsp. aculeatinodis Emery, Bull. Soc. Ent. Ital XXYUI 1896 d 60 8 

 Costa Rica, Jimenez. Also Brazil. ' ' , i ■ ^^. ^ . 



Var. pungent inodis Emery, Bull. Mus. Zool. Torino XI 1896 p "^ O 

 Mexico, Atoyac en Vera Cruz ; Panama. ' ' ' ' • -• -• 



3. L. Pittieri Forel, Biol. Centr. Am., Ill, 1899, p. 56. ^ . Costa Rica. 



4. LTristani Emery, Bull. Soc. Ent. Ital., XXVIII, 1896 p 61 xQ 



Forel, Biol. Centr. Am., Ill, 1899, p. .56 Jimenez, Costa Rica. * 



