Our most popular general use product is called Talstar. It is widely used by pest control companies because it is labeled for almost every insect you could have a problem with and you can use it outside the home as well as inside, it is odorless and very safe for use around children and pets. It is a liquid concentrate that you mix with water in a one gallon hand pump sprayer. It will last for 60 to 90 days outside in between treatments. It is also labeled for lawn and ornamental use, and can be used on trees, plants, bushes and shrubs for all sorts of ornamental pests including Japanese beetles, mosquitoes, and other leaf eating pests. Talstar is also available in a granule formula called Talstar PL if you prefer to use granules.
Based on the fact that you are in Texas and the description you gave, the multi-legged critter with the stingers on the back end sounds like it could be the Texas Red Headed Centipede (they are venomous) but we can't say for sure without seeing a picture of the insect. You can Google Texas red Headed Centipede to do a comparison if you like.
Talstar P is effective for fire ant control. Per the product label, "Fire Ant Mound control is optimized by combining broadcast applications that will control foraging workers and newly mated fly-in queens with mound drenches that will control existing colonies. If the soil is not moist, then it is important to irrigate before application or use a high volume application. Apply broadcast treatments at 0.5 to 1 fluid oz. per 1,000 square feet. Use enough finished volume to penetrate thatch or sod. Treat mounds by applying 1 oz of Talstar P per mound in 1 to 2 gallons water by sprinkling the mound until it is wet and treat 3 feet out around the mound. Use the higher volume for mounds larger than 12”. Treat mounds with sufficient force to break their apex and allow the insecticide solution to flow into the ant tunnels. For best results, apply in cool weather (65 - 80 F) or in the early morning or late evening hours."
Our most popular general use product is called Talstar. It is widely used by pest control companies because it is labeled for almost every insect you could have a problem with (including ants, roaches and silverfish) and you can use it outside the home as well as inside, it is odorless and very safe for use around children and pets. It is a liquid concentrate that you mix with water in a one gallon hand pump sprayer. It will last for 60 to 90 days outside in between treatments. It is also labeled for lawn and ornamental use, and can be used on trees, plants, bushes and shrubs for all sorts of ornamental pests including Japanese beetles, mosquitoes, and other leaf eating pests.
For mounding ants in the yard you may also want to consider using a bit such as Extinguish Plus. The bait will kill both the workers and other ants in the colony and sterilize the queens so the mounds won't keep moving and popping up in other places. (by using just a topical spray such as Talstar, only the ants that contact the treated areas are killed but the other ants that remain in the colony usually just move and make a new mound).
Talstar P is our most popular selling product for mosquito control. It is a liquid concentrate that you mix with water and apply using any hand pump sprayer or backpack sprayer. The key is to apply it to all shrubs, trees, and other foliage around the house or patio you are trying to provide relief at. It should be directed not only on top of the leaves and plants, but on the underside of the leaves as well which is where the mosquitoes hang out. It should be applied every 30 days for optimum control. It is also very good for bees and wasps, however you would not want to apply it or any other product directly to play sets where children will touch treated surfaces. Also, Talstar P is labeled for over 100 different insects and will work in just about any situation.