REVISION OF NEARCTIC TERMITES. 43 



Soldier. — Head more or less elongate, about as broad in front as 

 behind; labrum narrowed and pointed at tip; mandibles slender, 

 slightly curved, without teeth; gula narrowed in the middle, much 

 widened in front; a small, hyaline ocellus-like dot is seen above the 

 base of each antenna; fontanelle distinct, situate before the middle 

 of head. Pronotum broadest across front, sides rounded behind, 

 front margin indented in middle; legs moderately slender; body and 

 legs with erect hairs. 



KEY TO SPECIES. 



Winged. 



1 . Color pale brownish yellow hageni. 



Color dark brown to black 2 



2. Tibiae more or less plainly blackened 6 



Tibiae pale as the tarsi 3 



3. 0(3elli plainly more than diameter from eyes; wings grayish flavipes. 



Ocelli not more than diameter from eyes 4 



4. Wings grajdsh; tibiae often slightly blackish; length fully 9 millimeters; western 



species hesperus. 



liength 10-12 mm. ; eastern species lucifugus. 



Wings whitish: tibiae not darkened 5 



5. Ocelli about diameter from eyes; length nearly 10 mm claripennis. 



Ocelli much less than diameter from eyes; length hardly 8 mm.; eastern 



species virginicus. 



6. Tibiae hardly darkened; anal area largely pale; wings grajdsh hesperus. 



Tibiae plainly blackish; anal region not or barely pale 7 



7. Length to tip of wings about 10 mm.; color deep black; wings scarcely gray.. tibialis. 

 Length to tip of wing hardly 9 mm., color paler, especially head, wings gray- 

 ish humilis. 



Soldiers. 



.[ am not able at present to tabulate our species, but certain tend- 

 encies can be used to distinguish them in most cases, but can not be 

 relied upon in doubtful cases. 



KEY TO SPECIES. 



1. Head plainly broader behind tumiceps. 



Head not plainly broader behind 2 



2. Gula less than twice as broad in front as in middle tibialis. 



Gula fully twice as broad in front as in middle 3 



3. Head fully twice as long as broad ; California species hesperus. 



Eastern species lucifugus. 



Head less than twice as long as broad 4 



4. Head more hairy than usual humilis. 



Mandibles plainly longer than width of head var. hoferi. 



Head moderately hairy 5 



5. Mid-western species claripennis. 



Eastern species 6 



6. Larger species flavipes. 



Smaller species virginicus and hageni. 



