Calumma gastrotaenia — Short-nosed Chameleon
Also known as:
Perinet Chameleon, Malagasy Side-striped Chameleon
Subspecies I've seen:
C. g. gastrotaenia
Common Short-nosed Chameleon
Calumma gastrotaenia gastrotaenia — Common Short-nosed Chameleon
Analamazaotra Special Reserve (Perinét), Toamasina province, Madagascar—October 7, 1996
Sadly, I didn't get a decent picture of this smallish and odd-looking chameleon (not that all chameleons aren't somewhat odd-looking).
Analamazaotra Special Reserve (Perinét), Toamasina province, Madagascar—April 23, 2007
Common Short-nosed Chameleon (Calumma gastrotaenia gastrotaenia) Common Short-nosed Chameleon (Calumma gastrotaenia gastrotaenia) Common Short-nosed Chameleon (Calumma gastrotaenia gastrotaenia)
These chameleons were definitely easier to discover at night. I don't think we saw one during the day on our whole trip, though we saw at least a dozen at night.

Here is a list of all the reptiles and frogs I saw on this trip to Madagascar.

Ranomafana National Park, Fianarantsoa province, Madagascar—April 27, 2007
Common Short-nosed Chameleon (Calumma gastrotaenia gastrotaenia)
Just after darkness fell, we encountered this small chameleon while looking for nocturnal wildlife. He seems to be trying to hurry out of the frame.
Printed references: