38 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 6S 



This caste is apparently much more rare than the major and minor 

 soldier castes. 



Soldier^ Minor (pi. 3, figs. 5-6). — Head of same color and with 

 same bristles as major soldier, narrowed more gradually to nasus — 

 more pear-shaped and more constricted. Antenna 14 segments; 

 third and fourth segments longer than second, third twice as long, 

 fourth shorter than third, fifth sliorter than fourth. 



Legs longer than in N. (/>.) diversimiles. 



Measure?nents {tmnor soldier). — 



Length of entire soldier, 3.00-3.20 mm. 



Length of head with nasus, 1.40-1.55 mm. 



Length of head witliout nasus to anterior, 0.90 mm. 



Length of nasus, 0.G5-0.70 mm. 



Length of hind tibia, 1.20-1.30 mm. 



Length of pronotum, 0.15 mm. 



Width of head, 0.60-0.70 mm. 



Width of pronotum, 0.50 mm. 



The minor soldier of N. {Velociternies) hetei'o pterins has 15 seg- 

 ments to the antenna and has a wider head ; the bristles are differently 

 placed in TV. (F.) velox Holmgren, 



There is some doubt in which subgenus vielanoce'phalus should 

 be placed, or whether a new subgenus should not be established. 

 Although the soldiers have 14 segments to the antenna and are 

 dark colored, they are tritnovphiG and have relatively short legs., 

 while species of Diversiterraes have only 13 segments to the antemia 

 and are light colored; nevertheless this species has been included 

 in Diversitermes., and not in Velociternies., where the soldiers are 

 dimorphic and the legs are relatively long. It apparently occupies 

 an intermediate position between Holmgren's subgenera Diversi- 

 termes and V elociternies and this and other data rather indicate that 

 these subgenera are not valid. The post clypeus of the worker 

 is nearl}^ as long as half its breadth. Only two species of Diversi- 

 ternies are known, both being from America; the soldiers have 

 short legs, fairly long in the intermediate and minor types, the hind 

 tibia are shorter than the entire head. The known species of Veloci- 

 ternies have only 2 types of soldiers; only 3 species have been 

 described as yet from America. In VeJocitermes the third segment 

 of the antenna of the winged adult is elongate and clavate, the 

 soldiers have long legs, the hind tibiae being longer than the entire 

 head. 



Type locality. — Rosario, Bolivia. 



Described from a series collected at the tj^pe locality by W. M. 

 Mann in November, 1921; three soldier castes are morphotypes. 



Type., first form queen. — Cat. No. 27658, U.S.N.M. ; morphotypes, 

 soldiers. 



Other known Diversitermes found on this expedition are : 



