1967] 
Mockford — Electrentomoid Psocids 
119 
assess the phylogeny of the electrentomoids. In the section on phylo- 
geny, I discuss reasons for not regarding the electrentomoids as a 
single taxon at any level, although I previously considered them to 
form a single family (Mockford, 1966). 
Measurements were taken principally from whole specimens 
mounted temporarily in glycerine. The degree of precision of the 
measurements is indicated as follows: for wing measurements the 
micrometer unit equals 22.2/x, for tibial measurements the micrometer 
unit equals 7 -5/x, and for all other measurements the micrometer unit 
equals 3. 7ft. 
Terminology — The term clunium is used for the fused dorsal 
and lateral sclerotized regions of abdominal segments 8 through 
(probably) 10. The rounded cushion-like field of the paraproct gen- 
erally bearing trichobothria is called the paraproctal sensorium. Both 
of these designations follow Pearman (in litt. ) . A sclerite of the sub- 
genital plate, generally in the form of a letter T is designated T- 
shaped sclerite, although it may take other forms. The sac of the 
spermatheca is divided into two regions, one adjoining the duct, and 
the other further from the duct. The former is designated basal re- 
gion, and the latter distal region. The lacinial tip generally has two 
principal tines, here called median and lateral cusps, indicating the 
positions which these structures usually hold in relation to the mid- 
plane of the insect, although the lacinia is capable of a certain amount 
of rotation. In the bilobed third ovipositor valvula, the larger, more 
basal lobe is designated primary lobe, and the smaller, more distal 
lobe is designated secondary lobe. 
Acknowledgements. — Mr. Aaron M. Nadler of Brooklyn, N. Y., 
aided in making travel arrangements for my trip to South America 
in 1959 and accompanied me in the field on the trip. Mr. C. J. 
Rosales of the Facultad de Agronomia, Universidad Central de Vene- 
zuela, Maracay, provided transportation and guide service, as well as 
aided with the field work, while we were in Venezuela. Electrento- 
moids were collected on my trip to the Lesser Antilles and Trinidad 
in 1961. Mr. John K. Bouseman of the University of Illinois, 
Urbana, made travel arrangements for that trip and accompanied 
me on it. Mr. R. Aylifie, then forestry officer for the British Lee- 
ward Islands, provided transportation and served as guide while we 
were in St. Lucia. The staff of the New York Zoological Society 
Field Station at Simla provided our living facilities while we were in 
Trinidad. The discoveries of some of the rare and local Mexican 
species could not have been made without the help of several Mexican 
