. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Professor Riley did not note that the "white glistening soapy powder" appeared only when the larva was fully matured. Many of the fully grown larvae were transferred to tubes made of blotting paper. They lined these with silk, covered the upper opening and changed to chrysalids therein without any ap- parent objection to their new domicile. Of fifty eggs collected in ^larch. 1932. only three were raised to maturity. These were reared in a laboratory under abnormal conditions, in whic
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Professor Riley did not note that the "white glistening soapy powder" appeared only when the larva was fully matured. Many of the fully grown larvae were transferred to tubes made of blotting paper. They lined these with silk, covered the upper opening and changed to chrysalids therein without any ap- parent objection to their new domicile. Of fifty eggs collected in ^larch. 1932. only three were raised to maturity. These were reared in a laboratory under abnormal conditions, in which the temperature was relatively uniform throughout the winter, and no moisture was furnished to the plants. They emerged Feb. 10. 1933. All were dwarfed. A sec- ond lot, bred under conditions more nearly simulating their native environment resulted in a larger hatch of more normal images. Best results were obtained by collecting full grown larvae in Jan- uary and February, just prior to their pupation. These latter emerged between ]\Iarch 14th and April 27th. The species is heavilv parasitized bv Apatiiclcs niegafJi\'ini and by a Tachinid. The following observations on the life cycle may help to sup- plement Professor Riley's excellent account. Egg. Conoidal, with a depressed micropyle at the top. Base, flattened. Size, 3 mm. l:)road at the base, by mm. high. Color, when first laid, bright blue-green or turquoise, changing to pinkish ivory, and finally to a pale brown. All of the examples observed by us showed a more acute cone with less curve or bulge on the sides than is depicted in Riley's illustration. Our photograph. Plate 33, was taken at an angle so as to show the micropyle, and does not bring out this feature of the acutely sloping PLATE 33 Egg of Megathymus yuccae navajo magnified x 8. Photo by Menke Larva, first instar. Length, extended, 8 mm. ( Riley gives 6 mm.). Color, reddish, maroon, the abdomen slightly lighter. There is a black collar across the fi
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