12 
Psyche 
[March-June 
bear the same wing-length as wild-caught individuals from the same 
locality. 
The egg-adult developmental time for P. areas mylotes in the 
laboratory for individuals reared on Aristolochia constricta is sum- 
marized in Table i. In a previous study (Young, 1972a), the egg- 
adult developmental time of this butterfly on Aristolochia sp. from 
La Selva was about 42 days. The developmental time in that study 
was measured on eggs obtained from La Selva adults. The develop- 
mental time for eggs obtained at Tirimbina, and reared on A. con- 
stricta is 53 days (Table 1). This difference in developmental time 
between the two populations is apparent in eggs, larvae, and pupae: 
the egg stage lasts 4 days in La Selva individuals as opposed to 6 days 
in Tirimbina individuals ; the total larval period for La Selva in- 
dividuals is 17 days as opposed to 33 days in Tirimbina individuals; 
the pupal stage lasts 21 days in La Selva individuals as compared to 
14 days in Tirimbina individuals. 
Larval food plant acceptance 
Development from the egg stage on natural food plants is suc- 
cessfully completed in the laboratory (Young, 1972b; Table 1). 
When other species of Aristolochia are tested, differences in food 
plant acceptance by the larvae become apparent. Development is 
successfully completed, and without a change from the Tirimbina 
developmental time when larvae are reared from the egg stage on 
Aristolochia labiata Willd. in Costa Rica. But larvae die during the 
first instar when offered A. veraguensis Duchr. in Costa Rica. For 
Table 1 . The developmental time of Parides areas mylotes on a natural 
food plant, Aristolochia constricta, under laboratory conditions.* 
INSTAR 
INSTAR 
INSTAR 
INSTAR 
IN STAR 
TOTAL 
EGG 
1 
2 
3 
4 
5 
PUPA EGG-ADULT 
MEAN 
DURATION 
(days) 
6 
5 
5 
6 
6 
11 
14 53 
± S.E. 
± 0.1 
± 0.3 
± 0.5 
± 0.3 
± 0.2 
± 0.8 
± 0.2 
N 
46 
46 
42 
42 
40 
37 
37 
^Laboratory conditions consisted of confining larvae to closed plastic bags 
containing clippings of food plant. Physical conditions around the bags 
were 21-23 °C and about 45% relative humidity. See text for further details 
of rearing techniques, laboratory conditions, etc. 
