Leaf miner on Verbesina virginica - REK
I run into his work everywhere, whether responding to a finding on INaturalist or contributing 10,892 photographs on Bugguide, all for free use through Creative Commons. He is a member of a community of fellow "macrophiles" and amateur and professional entomologists out there who are willing to give us junior members help as needed.
Leaf miner tunnels with trails of frass - REK
|Red Velvet mite|
A leaf miner is any one of numerous species of insects in which the larval stage lives in, and eats, the leaf tissue of plants. The vast majority of leaf-mining insects are moths (Lepidoptera), sawflies (Symphyta, close relatives of wasps), and flies (Diptera), though some beetles also exhibit this behavior. Wikipedia
The course flyer will be available at the above link any day now, but for now I've copied and pasted the description below.
*He and Noah Charney wrote Tracks & Signs of Insects and Other Invertebrates which is an indispensable book for those who wander through nature wondering "what made that?" be it a gall, egg case, pupae, exuviae or an engraving left by an insect.