MANN: THE ANTS OF BRAZIL. 441 



97. Crematogaster (Cremaiogaster) stolli Forel. 



This very distinct species was abundant at all the localities visited 

 along the Rio Madeira. The covered galleries that it constructs 

 superficially resemble termite runways, but are built of fibrous 

 material. They extend along tree trunks, often in an irregular spiral 

 direction around the tree and branching to the limbs. The nest 

 varies from hemispherical to broad and flat, up to five or six inches 

 in width, though generally smaller. The brood-chambers are in deep 

 cavities. The acrid secretion from the anal glands of C. siolli is 

 much more pungent than that of any other Crematogaster which I 

 have observed. 



98. Crematogaster (Crematogaster) stolli subsp. autruni, subsp. nov. 



Worker. Length 4.5 mm. 



Head, excluding mandibles, a little broader than long, as broad in 

 front as behind, with rounded sides, broadly rounded occipital cor- 

 ners; the occipital border nearly straight, but narrowly concave at mid- 

 dle. Clypeus about as broad as long, with slightly rounded surface 

 and broadly rounded anterior border. Mandibles short and stout. 

 Frontal carinae feeble, but distinct, extending to opposite the eyes, 

 which are located at middle of sides of head. Eyes small and flat. 

 Antennae short and stout, the scapes arcuate, much thickened dis- 

 tally, extending about two thirds the distance to occipital corners. 

 First funicular joint as long as the two succeeding joints taken to- 

 gether; joints 2-7 as long as broad. Pro- and mesonotum together 

 as broad as long, evenly rounded above and at sides. Epinotum with 

 subequal base and declivity, the base rounded in profile, the surface 

 of base concave. Spines moderately long and stout. Petiole in 

 profile about twice as long as broad; from above, flattened and two 

 thirds as broad as long. Postpetiole elongate, rounded. Legs stout. 

 Gaster of medium length, triangular. 



Body sublucid. Head in front with sparse, fine punctation; cheeks, 

 sides of head and a space parallel to the frontal carinae densely 

 striolate. Mandibles rugosely striolate, with a few fine recumbent 

 white hairs. Antennae punctate, the funiculus with considerable 

 fine, recumbent pile. Promesonotum finely rugulosely punctate, 

 with a few very fine hairs. Epinotum and mesothoracic pleurae 



