70 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



tolerating young lizards and then, as they grow — whether they are her 

 OAvn offspring or not — gradually driving them out. 



The problems of a male the size of an adult female are not solved 

 even Avhen he finds a suitable activity range. As he continues to 

 grow, his activity range requirements change; he now prefers a larger 

 perch. He has grown big enough so that no female can chase him 

 from his established area, but he is also growdng big enough to challenge 

 the adult male whose activity range may overlap his. Again tAvo 

 things seem involved in the increasing conflict. The large male's 

 interest in him changes from courtship chases to more vigorous 

 aggressive attacks, and he himself becomes more aggressive toward 

 the big male. Though the big male may die or the younger may 

 defeat him and so remain and enlarge his area, it is more likely that 

 the young male will be driven out. The younger male is now adult 

 though small. With the activity range requirements of an adult male, 

 he finds that usually the best, most preferable home ranges are already 

 occupied by larger adult males that wUl not tolerate him on any of 

 their perches. Again he may have to travel considerable distances, 

 establishing himself temporarily in undesirable sites, perhaps staying 

 within the activity range of a large adidt but avoiding him by staying 

 hidden, probably moving several times before he finally finds a suit- 

 able place where he can establish ; and he, like the female, settles here 

 more or less permanently, making minor boundary changes or oc- 

 casional shifts to adjacent areas or forays to nearby perches. But he 

 is now an established resident who will court all the female-sized 

 lizards, mate with receptive females, eat the hatchlings, including his 

 own children, if he can catch them, and drive out any intruding 

 adult male. 



Daily Routine 



In previous sections I have discussed by topic various aspects of 

 the ecology and behavior of A. lineatopus. To bring these aspects 

 together and present a picture of the daily routine, this section 

 describes the behavior of a single adult male that I and another 

 observer, working in shifts, kept under surveillance for one full day. 

 We watched him from before sunrise until after sunset and lost sight 

 of him only for two 10-minute periods, though he was out of sight 

 for a few seconds a number of times. During the day, wc saw him 

 catch and eat food t^A-ice, copulate twice, drive another male from his 

 home range, and dispute with, a nearby male over the common bound- 

 ary of their home ranges. 



This male, no. 1, was a marked individual (60 mm S-V) that we 

 had kept under observation for several months. He had a home 

 range (fig. 3) which included a small tree about 20 feet tall that 



