24 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol.61. 



Wot'ker. — Head yellowish-white, longitudinal grayish markings, 

 not much longer than broad, broadest anteriorly, rounded pos- 

 teriorly; post-clypeus bulging, twice as broad as long. Antennae 

 yellowish-brown at apex, 15 segments; first segment long, stout and 

 cylindrical ; second shorter, more slender ; third slightly longer than 

 second. 



Pronotum saddle-shaped, yellowish. 



Abdomen gray. 



Legs yellowish, long, slender. 



Measurements. 



Length of entire worker : 5.0-5.75 mm. 



Length of abdomen jnul thorax together : 3.80-4.10 imn. 



Length of head : 1.65-1.75 mm. 



Length of hind tibia : 1.25-1.30 mm. 



Width of head : 1.40-1.50 mm. 



Described from a series of workers found with the typical soldier. 



A striking species of Armitermes ; the wide head of the soldier, 

 short nasus and position of the marginal tooth are very distinctive. 



Tyj^e locality. — Ceiba, Spanish Honduras. 



Described from a series of soldiers collected at the type locality 

 by Dr. W. M. Mann, of the Bureau of Entomology, U. S. Depart- 

 ment of Agriculture; in rotten log, February-March, 1920; soldiers 

 and workers were also found at Lombardia, Spanish Honduras. 



Type, soldier.— Cat. No. 24572, U.S.N.M. 



Genus CONSTRICTOTERMES Holmgren. 



In 1910, Holmgren divided the genus Eutermes Fritz Miiller 

 into many subgenera; however, certain American species do not 

 readily fall into these subgenera. In 1920, Banks adopted the name 

 Nasutitermes for one Eutermes form and raised the subgenus Con- 

 strictotermes Holmgren to generic rank. 



In general, the different species of the genus Constnctotennes 

 (as used in a broad sense by Banks) are similar to those of the 

 genus Nasutitermes; however, the head of the soldier or nasutus is 

 always constricted. Nevertheless, the species diverslmilis Silvestri, 

 froni^ South America, has three different types of soldiers and has 

 been placed in the subgenus Diversitermes Holmgren. Yet, if the 

 contour of the head alone were considered, the "large" soldier or 

 nasutus would fall in the genus Nasutitermes, whereas the " middle " 

 and " small " soldiers would be placed in the genus Goristrictotermes. 

 However, there are other striking characters in the nasute caste, 

 namely, the length of the legs, the number of hairs on the head, etc., 

 which vary considerably in \h^ different subgenera. In the worker 

 caste the relative length and width of the post-clypeus is of sub- 

 generic value. Most of the described species are from America. In 



