Subject:  New to my yard
Geographic location of the bug:  Southwestern PA, foothills of the Appalachians
Date: 08/14/2019
Time: 09:25 AM EDT
Your letter to the bugman:  I’ve just noticed these in my yard this year – and there’s quite a few of them.   Yesterday I saw one holding another smaller bug (gnat maybe?)in its, so I’m thinking they might be carnivorous.
How you want your letter signed:  Frankie

Gnat Ogre

Dear Frankie,
Your submission has us terribly amused.  We immediately suspected this to be a predatory Robber Fly in the family Asilidae, and we tried a web search for Robber Flies with huge eyes, and we quickly found some images posted to BugGuide indicating it might be in the genus
Holcocephala, but ala BugGuide is currently having technical difficulties and is not available, so we searched that genus name elsewhere and we encountered Discover Life where we learned members of this genus are commonly called Gnat Ogres, hence the source of our amusement.  For the sake of continuity, we are going to assume the prey you witnessed was in fact a Gnat.  The name Gnat Ogre is also used on iNaturalist.  According to iNaturalist, there are 40 species in the genus.

Gnat Ogre

What's That Bug? does not endorse extermination

Subject:  What’s this bug?
Geographic location of the bug:  Alabama
Date: 08/15/2019
Time: 10:30 PM EDT
Your letter to the bugman:  What is this?
How you want your letter signed:  Gillian McCown

Stump Stabber

Dear Gillian,
This is a female Giant Ichneumon in the genus
Megarhyssa, probably Megarhyssa macrurus.  Giant Ichneumons are sometimes called Stump Stabbers because the female uses her long ovipositor to deposit eggs beneath the bark of trees infested with wood boring larvae of Horntails.  They are not aggressive and they do not sting.

Subject:  Looks like string but moves
Geographic location of the bug:  Tampa
Date: 08/15/2019
Time: 11:20 AM EDT
Your letter to the bugman:  I am attaching a picture but I also have videos I have no idea what this is I thought I was losing my mind when I saw it move
How you want your letter signed:  Debbie

String That Moves

Dear Debbie,
We prefer not to weigh in on the state of your mind, but this looks to us to be a string that moved.  The object on the end of the toothpick appears to be of fibrous nature, possible plant or animal fibers, though we would not rule out it might be synthetic.  Light weight fibers will stir with the slightest breeze.

What's That Bug? does not endorse extermination

Subject:  Are these venomous?
Geographic location of the bug:  Sao Paulo, Brazil
Date: 08/16/2019
Time: 10:09 PM EDT
Your letter to the bugman :  Are these stinging caterpillars or slugs?
How you want your letter signed:  Danirl

Owl Butterfly Caterpillars

Dear Danirl,
These caterpillars are not venomous and they do not sting.  They are some species of Owl Butterfly Caterpillars from the genus
Caligo based on this CanStock Photo image and this Alamy image.  You can find some good information on Insetologia.

Subject:  Unknown caterpillar
Geographic location of the bug:  Atop Casper Mtn,. Wyoming
Date: 08/16/2019
Time: 02:28 PM EDT
Your letter to the bugman:  I would love to know the identity of this cat.  Photo taken 8/13/19.
How you want your letter signed:  Dwaine

Unidentified Moth Caterpillar

Dear Dwaine,
Despite the excellent detail in your images and the distinctive characteristics of this Moth Caterpillar, we are unable to provide you with an identification at this time.  Perhaps one of our readers will be able to assist in this identification.

Unidentified Moth Caterpillar

Subject:  Worm found on oak tree
Geographic location of the bug:  Virginia beach, VA
Date: 08/16/2019
Time: 05:05 PM EDT
Your letter to the bugman:  Found these on my oak tree this morning. 8/16/2019
How you want your letter signed:  Thanks, Duane Heidler

Sawfly Larvae

Dear Duane,
These are Sawfly larvae.  Sawflies are non-stinging relatives of wasps and bees with larvae that are frequently mistaken for caterpillars.  Based on the appearance of the individuals in this BugGuide image, and that the host plant is oak, we suspect your individuals are in the genus
Arge.