. Elementary entomology . Fig. 189. A water-scavenger beetle with wing-covers and wings expanded as when in flight. (Natural size) (After Folsom) order its scientific name, from colcos (a sheath) and pteroii (a wing). The beetles form one of the largest orders, with over twelve thousand species in America north of Mexico, belonging to some eighty families, only the most common of which will be mentioned. They have a complete metamorphosis, the larvae being commonly called grubs, and the pupae are usually found either in the ground 136

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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912