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Psyche 
[June 
people. I am especially grateful to Mr. Alejandro Manzano C. of 
Monterrey, who accompanied me on two collecting trips to southern 
Mexico, serving as field assistant, interpreter, and liaison with the 
local people. 
Specimens for study were borrowed in part from the Illinois State 
Natural History Survey, (Urbana), the United States National 
Museum (Washington, D.C.), and Mr. C. N. Smithers (Australian 
Museum, Sydney). Dr. Dale E. Birkenholz of Illinois State Uni- 
versity collected the unique type of one species in Costa Rica. Dr. 
W. L. Brown, Jr., of Cornell University (Ithaca, N. Y.) sent the 
first specimen of the bizarre form Protroctopsocus enigmaticus n. gen., 
n. sp., which aided considerably in placing this project in proper per- 
spective. Dr. Brown’s notes on the collecting site of that species 
were sufficiently precise so that I was able to go to the spot and 
collect a series of the species. 
The descriptive statistics based on measurements and ratios were 
run on an IBM 1620 computer. The program was borrowed from 
Dr. R. B. Selander, University of Illinois, Urbana, and was adapted 
to our computer by Dr. S. K. Wong, my research associate, and Mr. 
Brian Crissie of the Illinois State University Computer Center. 
To all of the above mentioned individuals and institutions I wish 
to express my sincere thanks. 
Classification of the electrentomoid Psocoptera 
The electrentomoids are here arranged in the following families 
and genera: 
Musapsocidae, new family 
Musapsocus, new genus 
Troctopsocidae, new name for Plaumanniidae Roesler 
Protroctopsocus new genus 
Troctopsoculus, new genus 
Troctopsocopsis, new genus 
Troctopsocus , new name for Plaumannia Roesler 
Manicapsocidae, new family 
Manicapsocus Smithers 
Epitroctes, new genus 
Compsocidae, new family 
Compsocus Banks 
Electrentomopsis , new genus 
Genera Incertae Sedis (probably Manicapsocidae or Compsocidae) 
Electrentomum Enderlein 
P arelectrentomuin Roesler 
