LIDICKER 1958 (July 25 cont.) country, but is still on the thick side. About here it got too dark for further observation. The general impression is that the Rio Yaqui itself is not much of a barrier to migration but that there is a fairly broad band of relatively uninhabitable habitat along either side of the river. We stopped in Guaymas & ate our 1st only meal out while in Mexico. Then we continued N toward Hermosillo. 85.2 mi. N Pitahaya (byrd) we saw a dead antelope jack on the rd. 14 mi further we stopped & had a good look at a W. Diamondback (Crotalus atrox). We stopped for gas in Hermosillo & continued N almost 25 mi. before camping for the night. There were lots of Antelope jacks seen along the rd. at night. July 26 We got a fairly early start again & continued N. 18.6 mi. S Loschinos we saw our last black vulture for this coast. 10 mi S Loschinos (10.5 mi. byrd.) 48 mi. S Casa Blanca, we picked up a large black colubrid with a reddish belly DOR. Shortly beyond this point we began to notice that Farquiharen splendens began to replace another species of ocella, which had been com. to this point. Also the desert gets more open with more cholla & jalo-verde. By almost 10 mi N Loschinos the other species of ocellus is pretty well gone - still a few. At 17.8 mi. S