54 BULLETIN 108, UNITED STATES NATIONAL MUSEUM. 



size and color of wings; the ocelli are, however, plainly separated 

 from the compound eye (in hesperus practically touching the eye) 

 and the basal joint of the antenna appears to be shorter than in that 

 species. 



R. luclfugus matures later than R.. Jiavipes; winged adults were 

 taken from a colony on June 9, 1918. The adults from this colony 

 had not yet swarmed this year. 



Subfamily Termitinae. 



KEY TO GENERA. 



Adiilts. 



1. No ocelli ; clypeiis three times as broad as long Leucotermes. 



Ocelli present 2 



2. Front tibia with an outer as well as two inner apical spines; fontanelle very dis- 



tinct Amitermes. 



Front tibia with only the inner pair of apical spines 3 



3. Third joint of antennae plainly longer than the second or fourth. . Constrictotermes. 

 Third joint not longer than second 4 



4. Fontanelle hardly visible; mandibles more elongate than usual Anoplotemies. 



Fontanelle distinct although small, elongate and somewhat divided below; man- 

 dibles of usual length Nasutitermes. 



Soldiers. 



1. No soldier caste Anoplotermes. 



Soldier present 2 



2. Head nasute 3 



Head not nasute 4 



3. Head constricted ; legs very long Constrictotermes. 



Head not constricted ; legs less long Nasutitermes. 



4. Mandibles with more or less distinct teeth Amitermes. 



Mandibles without teeth 5 



5. Labrum broad and divided or concave on tip Eutermes. 



Labrum pointed at tip Leucotermes. 



Of Eutermes as here defined, with E. dehilis as type, we have no 

 species m our coimtry, the species previously so recorded going to 

 Constrictotermes and Nasutitermes. 



Workers. 



1. Third joint of antennae plainly longer than the second; head dark; right mandible 



with three distinct teeth; maxillae with inner tooth halfway out on outer pro- 

 cess Constrictotermes. 



Third joint of antennae not longer than second 2. 



2. Antennae 15 or 16-jointed; head whitish Leucotermes. 



Antennae 13 or 14-jointed 3. 



3. Right mandible with three distinct teeth 4. 



Right mandible with but two distinct teeth; inner lobe of maxillae broader, 



rounded on tip, with bristles or slender spine Amitermes. 



4. Inner lobe of maxillae narrow, pointed at tip, with stout spines Anoplotermes 



Inner lobe of maxillae broad, rounded on tip, with fine hairs Amitermes (part). 



