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#naturalhistory

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The mimics and the mimicked. Note how the spider and the beetle not only reddish brown with black at posterior end but they both have two white perpendicular dashes that separate these colors. These white dashes probably make them look like they have a waist like the carpenter ant.

I observed these today on a hike at a local state park. Species names are in the alt tags.

#spider#beetle#ant

Megischus bicolor (Bicolored Crown-of-thorns Wasp). Notable features of this parasitoid wasp are the long "neck," enlarged and toothed hind femora, and teeth on the head (from where its name is derived). Although it appears wingless, they're there--just held tightly against the body. Females have an ovipositor that exceeds their body length--used to lay eggs in larvae of wood-boring beetles.

Four flies for #FridayFlyDay which I photographed in the back yard yesterday.

Genus Zacompsia (I think)--a picture-winged fly in the family Ulidiida. Neotephritis finalis
(Sunflower Seed Maggot fly)--a species of fruit fly in the family Tephritidae. Genus Elachiptera--genus of frit flies in the family Chloropidae (larvae feed on grasses). Cylindromyia intermedia--a species of bristle fly in the family Tachinidae.

Meet Rhinocyllus conicus (the Nodding Thistle Receptacle Weevil). Native to Eurasia and North Africa, it was introduced to the United States in 1969 as a biocontrol for invasive thistle. However, it began attacking native thistles also. The larvae feed on the flower receptacle, reducing seed production.

#OTD in 1859.

Charles Darwin sent John Murray the first three chapters, and a proposal for the book's title. An early draft title page suggests On the Mutability of Species. In September the main title still included "An essay on the origin of species and varieties", but Darwin now proposed dropping "varieties".

en.wikipedia.org/wiki/On_the_O

On the Origin of Species at PG:
gutenberg.org/ebooks/1228