224 
Psyche 
[September-December 
the late Jerry Herdina (formerly of Berwyn, Illinois), whose col- 
lection has subsequently been donated to the Field Museum of 
Natural History. 
Examination of previously studied specimens, including types, 
has been made possible through the courtesy of the curatorial 
staff of the following institutions: Illinois State Museum, Spring- 
field, Illinois; National Museum of Natural History, Smithsonian 
Institution, Washington; and the Peabody Museum, Yale Uni- 
versity. The extensive series of unstudied specimens and of types 
in the Field Museum of Natural History has been essential for 
our investigation. 
Order Protorthoptera Handlirsch, 1906 4 
Family Eucaenidae Handlirsch 
Eucaenidae Handlirsch, 1906a, p. 709; 1906b, p. 164; 1919, p. 52; 1920, p. 161. 
Teneopteridae Richardson, 1956, p. 56 
This family embraces a single genus, which in turn is known 
from but a single species. We suggest that the following charac- 
ters are significant on the family level. Fore wing coriaceous; 
costal area wide; SC, R1 and main stem of RS close together, 
parallel; all major veins arising near base; RS pectinate; CUP 
strongly concave, aligned in part with the anal furrow; anal area 
small. Hind wing membranous. Head slender, antennae long, 
setaceous, most of the segments alike; mandibles dentate; maxil- 
lary palpi very long; eyes small but prominent; prothorax long 
and broad, covered posteriorly with heavily sclerotized prono- 
tum; legs similar; femora stout, tibiae slender, tarsi with 5 tarso- 
meres; abdomen no longer than thorax plus head; 11th segment 
with very short cerci; some or all abdominal segments with poste- 
riorly directed lateral lobes; females with short ovipositor; fem- 
ora, tibiae, and thoracic tergites prominently sculptured. 
Handlirsch’s several definitions of this family emphasized what 
he took to be blattoid characters of its single genus, Eucaenus. 
Richardson’s definition of the family Teneopteridae was based 
4 We are including in this order the species variously assigned by some students of 
fossil insects to the orders Paraplecoptera and Protoblattodea, as well as those 
in the order Protorthoptera (s.s.). The reasons for this treatment have been sum- 
marized by Carpenter (1966, pp. 51 55). 
