1983] 
Betz — Biology of Trichaclenotecnum 
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area on a female’s bark. Even though a female was not nearby, three 
males exhibited sideways gaiting, wing fanning, and backward move- 
ment, while two others only displayed a higher level of activity. All 
five males were active, and each found a female about 10 minutes 
after introduction to the female’s bark. 
A female had to raise the anterior part of her body for a male to 
be able to fit beneath her. Females always assumed a characteristic 
appearance for this purpose that I here term the receptive posture. 
In the receptive posture, the fore- and midlegs were moderately 
extended, the hindlegs were slightly extended, and the antennae were 
swept back along a female’s body (Fig. 2b). Most (83.3%) females 
assumed the receptive posture when males touched them with their 
antennae (Table 1 , C). Some ( 1 5.6%) females assumed the receptive 
posture when males performed the sideways gait. One female waited 
until a male was backing underneath her. 
Females assuming the receptive posture early in courtship (i.e., 
before antennal contact was made by a male) elicited less wing 
fanning from males. Males exhibited all of the actions involved in 
courtship, but performed them more rapidly. On the other hand, the 
female not assuming the receptive posture until a male began to 
move beneath her did not appear to inhibit the male from courting 
normally. 
After a courtship failed, a male often fanned his wings around a 
female for a longer period of time during the next one, regardless of 
whether a female assumed the receptive posture when a male was 
approaching or courting (N=10). These prolonged courtships 
always led to copulation. 
A male had to crouch slightly just prior to moving beneath a 
female, even though she had assumed the receptive posture. This 
position is shown in Figure 2a. Males remaining in a standing posi- 
tion were blocked from moving past the coxae of the females’ legs 
(N = 2). Furthermore, at this time a male’s abdomen became slightly 
arched along its length, raising the posterior end. 
A male’s wings were kept extended over his body as he backed 
underneath a female, and she rested her fore- and midlegs on him. 
When the genitalia of a pair were apposed, the head of a female was 
positioned between and slightly caudad of a male’s raised hindwings. 
As a male moved under a female, the shelf of his epiproct, which 
normally rested in a posterodorsal position, struck a female’s sterna 
