Your search within this document for 'coua' resulted in three matching pages.
1 Page 138

“...on his favourite perch, and the Sandpiper (Fandiafasika) was bobbing along the sand-reaches. The Oriole, the Wagtail, the Hoopoe, and a large bird like a Shrike were there; even the small Sun-bird (Anatsoy) darted from place to place, his bright colours sparkling in the light. In about half an hour I had picked out and obtained the specimens I wanted, among which was a small Owl, very dark brown with white spots—it was new to me (Ninox superciliaris)." "Just at the crossing I got another of the Coua Cuckoos (Taitso)." "On the way to the next village we passed a small marsh on which were numbers of Muscovy Ducks, and among the long grass in the valley the Guinea-fowl were seen in hundreds." 1.—The first bird in the arrangement of this Order is the Collared or White-necked Crow; and although he can by no means be reckoned as a song-bird, he is a very prominent member of the Avi-fauna of Imdrina—indeed of the whole of Madagascar,—and must therefore have a few words of description. This Crow—called...”
2 Page 205

“...are stockaded by numerous sharp stiff projections that would be far from agreeable to the palate of any bird that might make an attempt on the dainty morsel inside. Whatever may be said to the contrary, birds are not abundant in the forest, and of singing birds worth listening to there are absolutely none. The long and shrill whistle of the black parrot is perhaps more frequently heard than the voice of any other bird. I have already referred to the Kankafotra, a kind of cuckoo. Another cuckoo (Coua ccBrulea, L.), dressed all in blue from head to tail, may very fre- quently be seen (for it is not at all a shy or timid bird) hopping from twig to twig on the lower branches of the trees. This bird is a weather prophet to the natives, for, rightly or wrongly, they assert that if the Tailso (or Kaitso) calls when the weather is fine, it will be wet, and if wet, it will be fine. Suspended to branches overhanging the streams may be frequently seen the nest of the Fodi/etsy (Ploceus pensilis, Gm...”
3 Page 229

“... the other does not fly away, but perches or flies round close at hand calling for its mate. Of the smaller birds the most noticeable are large flocks of parroquets (Psiitacula madagascariensis), which keep to the more open tracts; the honey-bird {Nectarinia souimanga) ; the weaver (Ploceus madagascariensis), of bright red colour; two kinds of dark blue waterfowl with red beak and legs (Porphyrio smaragnotus and P. alleni); two kinds of cuckoo, one a very handsome blue bird with a long tail [Coua azrulea) ; the other a brown bird with long dark brown tail (Centropus madagas- cariensis'). The banks of the river are alive with kingfishers (Corythornis cristatus), which much resemble the English bird, and there is also a rarer species of red kingfisher {Ipsidina madagascariensis) to be found as well. A bird almost as common as the kingfisher is the bee-eater (.Merops madagascariensis), of a bright green colour. Herons and bitterns are also numerous, and the marshy places are the abode of...”