160 Zoologica: N. Y. Zoological Society [HI; 4 



Hairs whitish, short, less abundant and more delicate than 

 in the worker and female; the longer hairs on the femora and 

 tibiae reclinate. 



Piceous brown; head darker and more blackish; mandibles, 

 antennae, legs, genitalia and incisures of gaster pale brownish 

 yellow. Wings as in the female. 



Described from specimens belonging to a single colonv 

 mhabiting the petiole of a young TachigcUia at Kartabo (Sept. 3). 



18. — Leptothorax (Goniothorax) umbratilis sp. nov. 



Worker. Length 1.7-2 mm. 



Head subrectangular, very slightly longer than broad and 

 slightly broader behind than in front, with nearly straight 

 posterior border and very feebly convex sides ; the eyes moderately 

 convex, their posterior orbits at the median transverse diameter 

 of the head. Mandibles convex, their apical borders with five or 

 six small teeth. Clypeus distinctly concave in the middle, without 

 carinas, the anterior border entire and transverse in the middle, 

 large but rounded and lobular. Mesoepinotal impression distinct 

 but shallow. Frontal groove absent. Antennas 11-jointed ; scapes 

 reaching to within a distance equal to their greatest diameter 

 of the posterior corners of the head ; second funicular joint as 

 long as broad, joints 3-7 distinctly broader than long; tWo basal 

 joints of club subequal, longer than broad, together shorter than 

 the enlarged terminal joint. Thorax shaped much as in 

 echinatinodis, flattened above, marginate on the sides, with 

 bluntly acuminate anterior humeral angles ; lateral mesonotal 

 angles rather acute, those at the base of the epinotum quite as 

 large but rounded and lobular. Mesoepinotal impression distinct 

 but shallow. Epinotal spines short, stout and curved, not longer 

 than their distance apart at the base, directed upward, backward 

 and outward, much shorter than the base of the epinotum. 

 Petiole about one and one-half times as long as broad, slightly 

 broader behind than in front, with tubercles arranged as in 

 echinatinodis but much smaller. In profile the petiole is longer 

 than high, the node rather low, the peduncle short and indistinct ; 

 the ventral surface concave, with a small, downwardly directed 

 tooth at the anterior end. Postpetiole broader than long, broader 



