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| Mating leatherwings - Click to enlarge |  |  | 
In the fall, a young beetle's fancy turn to thoughts of....... making more beetles.
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| PL - click to enlarge 
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We are seeing these soldier beetles on flowers in Barb's backyard.  These are 
Pennsylvania Leatherwings (Chauliognathus pennsylvanicus),
 aka Goldenrod Soldier Beetles we will call PL.  They are members of the
 Cantharidae family of soldier beetles.  The "soldier" label comes from 
the coloration of this family which reminds some of uniform 
decorations.  The "leatherwing" refers to their front pair of wings 
(elytra) which are hard in most beetles but flexible and leathery in PL.
Many
 of them are linked as mating pairs, the female intent on eating and the
 male on.....well you know what I mean.  They seem to mate non-stop and 
at times, finding a single is unusual.  "Size matters" as males in a 
breeding pair are usually larger than single males nearby.
They
 resemble fireflies without the electronic gear, and some sources 
suggest that this coloration protects them from predators familiar with 
the toxic secretions that fireflies produce.  They also manufacture 
their own brand of defensive chemical which they can release from their 
abdomen.
They are found in large numbers on flowers that bloom
 from August through October.  They seem to mate non-stop and at times, 
finding a single PL is an exception.  While feeding on pollen and 
nectar, they are also opportunistic omnivores, snacking on small 
insects  and caterpillars for variety.  They do not damage plants and 
eat some less desirable insects like aphids.  
"Adult females lay their eggs in clusters in the soil. The dark-colored, 
long, slender, worm-like larvae are covered with tiny dense bristles, 
giving a velvety appearance. They spend their time in the soil, where 
they are are predators of other insects, eating grasshopper eggs, small 
caterpillars and other soft-bodied insects."  Wisconsin Horticulture
Bug of the Week has this interesting story of a zombie fungus attacking our leatherwings. 
"A fungal pathogen called Entomophthora lampyridarum lurks in 
the landscape waiting to infect soldier beetles when conditions are right. 
After penetrating the surface of the hapless beetle, the fungus takes 
control of its host and zombie-fies it. 
The fungus causes beetles to march to the upper leaves of the plant, 
clamp onto leaves with their jaws, and spread their wings in the final 
act of death. This allows fruiting bodies to erupt from the upper 
surface of the beetle and spew their spores into the environment where 
they disperse and infect other victims. While we lament the loss of 
beneficial soldier beetles to their disease, in the greater scheme of 
things Entomophthora fungi are highly beneficial causing 
epizootics that can decimate nasty pests like gypsy moths, house flies, 
and locusts. Some entomologists believe that fungi are the primary 
regulatory agents of insect outbreaks worldwide. Glad they infect bugs 
and not us. " 
Bug of the Week also has this video of mating leatherwings while the female is hard at work, supporting the male, something that my wife can relate to.
 More on soldier beetles in general at this 
University of Kentucky site.