During my last week of collecting in the Huachuca Mts., Cochise Co., Arizona, I found, Aug. 11th, 1899, eighteen Datana larvæ on a Manzanita bush (Arctostaphylos glauca) or Western bearleaf. This larva was not known to me, and therefore I was anxions to send it to theartist who made the figures for Prof. A. T. Packard's “Bombycine Moths.” To all appearance the larvæ were nearly full-grown, and I had a negative taken of them by an ornithologist camping near by, so as to have a memento left in case they should transform before reaching their destination. Cloudy rveather and drizzling rain late in the day made it difficult to obtain a good picture. I had to mail the insects early the next morning from Fort Huachuca, which is 12 miles from Ramsey Canyon, and further delay was hazardous.