1984] 
Mockford — Psocoptera 
313 
Pseudocaeciliidae Pearman (type Psocus citricola Ashmead). Dis- 
tal margin of labrum with 4 sensilla on outer wall in form of rela- 
tively long, thin-walled setae with acuminate tips and 5 sensilla of 
usual form in pockets or shallow trough on inner wall (“type 2” of 
Table 1) (Fig. 2); lacinial tip with lateral tyne relatively slender; tarsi 
in adult 2- or 3-segmented; pretarsal claws generally lacking preapi- 
cal denticle, at most with a minute denticle ( Cladioneura , some 
Pseudo caecilius, Mesocaecilius quadrimaculatus Okamoto); pulvil- 
lus broad; M-Cu stem in forewing generally with two ranks of setae; 
abdomen with one or more ventral eversible vesicles; hypandrium 
generally with paired lateral lobes or processes; aedeagus pointed 
apically; external parameres extending well beyond tip of aedeagus; 
subgenital plate bilobed distally; second valvula bearing an acumi- 
nate process medio-distally. 
The curious genus TrimeroeaecUius Meinander was placed here, 
apparently correctly, by its author (Meinander 1978). It is known to 
differ from the above description by the following characters: lacin- 
ial tip with lateral tyne short and truncate; pretarsal claw with a well 
formed preapical denticle; pulvillus slender; hypandrium with no 
trace of lateral lobes or processes. I did not include Trimero caecilius 
in my Table 1 because information is vague or lacking for it about 
three of the characters being compared: nature of the apex of the 
aedeagus, nature of the labral sensilla, and presence or absence of 
abdominal eversible vesicles. 
In addition to the unifying characters noted in Table 1, certain 
other observations bear on the unification of the 2-tarsal segmented 
and 3-tarsal segmented forms of this family. The dorsal setose flap 
noted by Thornton, Wong, and Smithers (1977) of the female epi- 
proct of Zelandopsocus, (the “flap” is a rather low ridge in Z. cumu- 
lus, Fig. 3), which always bears a transverse row of setae, is also 
present in Pseudocaecilius, Ophiodopelma, and Pseudoscottiella. 
The endophallic sclerotizations of some species of Zelandopsocus, 
and Austropsocus, are similar to those of some species of Allocaeci- 
lius, Cladioneura, Heterocaecilius, Scytopsocopsis, and in Meso- 
caecilius quadrimaculatus. Included genera: Pseudocaecilius 
Enderlein, Allocaecilius Lee and Thornton, Allopsocus Banks, 
Austropsocus, Smithers, Cladioneura Enderlein, Heterocaecilius 
Lee and Thornton, Mesocaecilius Okamoto, Ophiodopelma Ender- 
lein, Phallocaecilius Lee and Thornton, Pseudoscottiella Badonnel, 
