Genus Megathymus Riley
(1) Megathymus yuccæ (Boisduval & Leconte), Plate CL, ♀ (The Yucca Skipper).
The caterpillar of this species is a wood-borer, feeding in the pith and on the underground roots of different species of Yucca. The life history has been beautifully worked out by the late Prof. C. V. Riley, who published a full account of his observations in his “Eighth Annual Report of the State Entomologist of Missouri,” pp. 169 et seq., and in the “Transactions of the St. Louis Academy of Science,” Vol. III, pp. 323 et seq. The student will do well to refer to these interesting papers. The figure we give on the plate is that of a female specimen bred by Professor Riley in Missouri and presented by him to the late W. H. Edwards, whose collection is now the property of the writer.