Paul DeBenedictis 1960 Aug 25 Gyalopion quadrangularis desutorum 38.6 mi N Hermasilla, Sonora, Mexico (T. Papenbus H.A. Eudey Collectors) [no number] (copy). "A 9" specimen was found at 11:40 PM lying on the highway. When a light shined on it, the snake moved slowly across the road. The weather at the time was fair and there was no wind or rain. No moon was present. The vegetation in the area was wet from light rain during the afternoon. The ground was quite dry and hard packed. The ground was covered with green grass and other small plants 1' to 2' high. Shrubs 2'-10' high were scattered 10'-50' apart. Moths, June-bug beetles and other night flying insects were very numerous. The soil was a sand gravel mixture. The surrounding area consisted of low rolling hills. No vachy crops were present in the near vicinity."