28 PROCEEDINGS OP THE NATIONAL MUSEUM vol. 08 



N. {N.) aui'antiacus Holmgren is more reddish colored than 

 N. {N.) minor Holmgren, has a smaller head, and the smaller ocelli 

 are more distant from the eye. 



Described from a single first form queen collected at Rosario, 

 Bolivia, in November, 1921, by W. M. Mann with soldiers and 

 workers associated with Microcerotermes arboreus Emerson sol- 

 diers and workers in a tree nest; queen hitherto unloiown. These 

 specimens are deposited in the collection of the United States Na- 

 tional Museum. 



NASUTITERMES (NASUTITERMES) CRASSUS. new species 



Soldier. — Head castaneous-brown (reddish tinge), smooth, shin- 

 ing, with two to three rows of bristles (on the base of the nasus, 

 vertex, and posterior margin — last row sometimes not present), 

 in profile nearly straight except for the elevation at the base of 

 the nasus, head broadly rounded, flat on vertex. Nasus somewhat 

 lighter colored, elongate, not very thick, turned down at apex. 

 Mandibles with sharp points. 



Antenna yellow-brown, with 13 segments, middle segments elon- 

 gate, shorter toward apex, with long hairs ; third segment elongate, 

 subclavate, longer than second or fourth segments; fourth longer 

 than second ; fifth longer than fourth ; last segment slender, shorter 

 and subelliptical. 



Pronotum yellow-brown, darker anteriorly, saddle-shaped, not 

 emarginate anteriorly, with long hairs. 



Legs light yellow-brown, elongate, slender, with long hairs. 



Abdomen with tergites castaneous brown, with reddish tinge, 

 with a row of long bristles at base of each tergite ; cerci fairly long. 



Measurements. — 



Length of entire soldier, 4.00-4.20 mm. 



Lcngtli of head with nasus, l.SO-1.90 mm. 



Length of head without nasus (to anterior), 1.25 mm. 



Length of nasus, 0.65 mm. 



Length of pronotum, 0.30 mm. 



Length of hind tibia, 1.45 mm. 



Width of head, 1.30 mm. 



Width of pronotum, 0.80 mm. 



Worker. — Head castaneous-brown with gray tinge, hyaline mark- 

 ings, median longitudinal line connecting fontanelle with epicranial 

 suture. Antenna 14 segments. 



Measurements. — 



Length of entire worker, 5.00-5.75 mm. 

 Length of head, 1.95-2.00 mm. 

 Width of head, 1.65-1.75 mm. 



