4 
Psyche 
[March 
Living and preserved specimens were lent or given to me by 
Drs. Robert E. Silberglied and Thomas Hlavac (Museum of Com- 
parative Zoology), M. A. Kolner and F. F. Hasbrouck (Arizona 
State University, Tempe), and James A. Slater (University of Con- 
necticut); to these individuals I express great appreciation. In 
addition, warm thanks are extended to: Nancy F. Henry, for in- 
valuable collecting assistance in the field and moral support at 
home; Mr. Vincent Roth of the Southwestern Research Station, 
for his advice on my field work in Arizona; M. Professeur A. Haget 
(Universite de Bordeaux) for helpful suggestions pertaining to my 
collecting trips in France; and Drs. C. W. Rettenmeyer, C. W. 
Schaefer, and J. A. Slater (University of Connecticut) for their 
constructive comments on the manuscript. 
Special thanks are extended to my colleague, friend and former 
advisor Professor Frank M. Carpenter, who has been consistently 
encouraging and helpful to me in my work on the Neuroptera. 
Methods and Materials 
Ascalaphid larvae are extremely difficult to find in the field, even 
with intensive litter-sifting efforts. For this reason, field-laid eggs 
of the two owlfly species were collected, using techniques outlined 
in a previous paper (Henry, 1972). Eggs of Ascaloptynx furciger 
and Ululodes mexicana were found in abundance during August 
and September in the Chiricahua and Peloncillo Mountains, within 
a 25 mile radius of the Southwestern Research Station of the Amer- 
ican Museum of Natural History (SWRS) in southeastern Arizona. 
Elevations of egg sites ranged from 1500 to 1800 meters (see Henry, 
1972). Larvae hatching from these egg masses were maintained in 
15 x 60 mm plastic petri dishes, one insect per dish, on a substrate 
of sterile sand ( U. mexicana ) or dried leaves of oaks native to Ari- 
zona egg sites (A. furciger ). Each isolated larva received a letter 
and number designation and its movements, molts, etc., were re- 
corded in chart form. Some dishes with larvae were kept in a one 
cubic foot wooden cabinet with regulated photoperiod but unregu- 
lated temperature regimen; others occupied a constant temperature 
and photoperiod Precision Scientific/ GE Model 805 incubator. 
Temperature in the first chamber ranged from 30° C in the “day” 
to 22° C at “night;” the incubator was set for a constant 29° C. Light 
period was normally maintained at LD (light/dark) 16:8 hours. 
