LIBRARY

EMBIOPTERA 181
distributed with date offshoots into Texas, Arizona, and California, and
probably elsewhere. According to Ross, other species introduced into North
America are O. humbertiana (Saussure) into Mexico and O. sazmdersii (Westwood)
into Florida, Texas, and Mexico. These two last-named species are the
most widely distributed embiids throughout the subtropical and tropical
regions of the world.
KEY TO FAMILIES
(By Consett Davis and E. S. Ross)
1. Tertiary or recent 2
Permian . . PROTEMBIIDlE
2. Ventral structures in the male terminalia markedly asymmetrical. 3
Ventral structures in the male terminalia not markedly asymmetrical
. CLOTHODIDlE
3. Fission of 10th abdominal tergite of adult male incomplete, hemitergites
of this segment not separated by a membranous area extending
forward to ninth abdominal terf.,rite . 4
Fission complete, hemitergites separated by a membranous area reaching
ninth abdominal tergite . 7
4,. Wings with radial sector three-branched . 6
Wings with radial sector two-branched . 5
5. Left cercus of male smooth, without echinulations on inner side, always
two-segmented, mandibles with apical dentations . OLIGOTOMIDlE
Left cercus of male generally echinulate on inner side, often one-segmented;
mandibles without apical dentations. certain ANISEMBIIDlE
6. Wings with R2+3 bifid, RHo simple . TERATEMBIIDlE
Wings with R'+5 simple, R4+6 bifid OLIGEMBIIDlE
7. Central and North American genera with RH6 simple, or wingless.
certain ANISEMBIIDlE
Otherwise. 8
8. Indo-Malaysian or Australian genera with the left cercus of the male
one-segmented. NOTOLIGOTOMIDlE
Indian, African, Mediterranean, and Neotropical genera with the left
cercus of the male two-segmented, the second segment being distinct
. EMBIIDlE
Suborder PROTEMBIOPTERA Tillyard
Family PROTEMBIlDJE Tillyard
Genus Prolembla Tillyard .
Tillyardembia Zalessky .
Suborder EUEMBIOPTERA TilIyard
Family CLOTHODIDJE Enderlein
Genus Clothoda Enderlein .
SUBORDERS AND FAMILIES
(By C. Davis and E. S. Ross)
Kansas Permian
Russian Permian
South America, Florissant
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