10 BULLETIN 108, UNITED STATES NATIONAL MUSEUM. 



SYNOPSIS OF FAMILIES AND SUBFAMILIES. 



1. Clypeus not divided by median line; radial sector with one or more superior 



branches (rarely none); no fontanelle; gula longer than broad. 



KALOTERMITIDAE— 2. 

 Clypeus divided by a median line; radial sector without superior branches; fonta- 

 nelle present or indistinct; gula as broad as long TERMITIDAE — 5. 



2. Hind wing with large post-anal field, costal and subcostal veins distinct; ocelli 



present; wings reticulate Mastotermitinae . 



Hind wing without post-anal field 3 . 



3. Wing margin ciliate, wings not reticulate; no ocelli Stolotermitinae. 



Wing margin not ciliate; wings more or less reticulate 4. 



4. No ocelli; tibia usually with more than three spines Termopsinae. 



Ocelli present; tibia with three apical spines Kalotermitinae. 



5. Wings clear, without hairs, margin not ciliate; posterior venation indistinct, partly 



reticulate Rhinotermitinae . 



Wings more or less opaque, outer and hind margins ciliate. or at least membrane 

 near margin hairy; posterior venation distinct Termitinae. 



TABLE OF AMERICAN TERMITOIDEA. 



KEY TO FAMILIES AND SUBFAMILIES. 



Winged. 



1. Radial sector with some apical superior branches; clypeus not bilobed; 



no fontanelle; gula longer than broad; wing margin not cHiatod; pulvillus 



present KALOTERMITIDAE— 2. 



Radial sector without superior branches; clj'peus bilobed; fontanelle more or less 



distinct; gula as broad as long; pulvillus absent; cerci two or three jointed 



TERMITIDAE— 3. 



2. Cerci plainly five or six jointed; no ocelli; wings reticulately veined; legs reach 



much beyond body Termopsinae. 



Cerci two or three jointed; ocelli present; wings but little if at all reticulate 

 Kalotermitinae. 



3. Outer and hind margins of wing not ciliated; wings clear without hairs, more or 



less reticulate; clypeus usually fully three times as broad as long; posterior 

 venation no darker than membrane; legs reach beyond tip of body 



Rhinotermitinae. 



Outer and liind margins of wings minutely ciliated; wings opaque, more or less 

 hairy, rarely reticulate ; clj'peus usually not three times as broad as long ; poste- 

 rior venation darker than the membrane Termitinae. 



Soldiers. 



1. Cerci prominent, of three or more joints; tarsi of five joints; tibia with spines before 



apex; no fontanelle; cl>7)eus not bilobed; mandibles toothed, but unlike 



Termopsinae. 



Cerci indistinct, of one or two joints; tibia at most with 2 to 3 apical spines, tarsi 

 of not more than four joints 2. 



2. Clypeus not bilobed; tibia with three apical spines; mandibles toothed, either 



unlike or alike; no fontanelle; head never nasute Ivalotermitinae. 



Clypeus bilobed; tibia not spined; mandibles not toothed, or toothed alike; fonta- 

 nelle more or less distinct 3. 



3. Gula region as broad in middle as in front; pronotum more or less bent down on 



sides, somewhat diamond shaped; head nasute or else mandibles toothed 



Termitinae. 



Gula region narrowed in middle ; pronotum flat, about as broad in front as in middle ; 

 head never nasute; mandibles not toothed Rhinotermitinae. 



