Wasps come in all shapes and sizes, from the frighteningly large (and frighteningly named) cicada killer, to the tiny fig wasps, so small you need a microscope to see them. Mud daubers and paper wasps are fairly large, easy to see, as are the yellow jackets that chase after the garbage at the picnic site. But in my back yard, I can see one of the more interesting little wasps, Pimpla marginella, less than 1/2 an inch long but memorably attired with a thorax and legs in stunning red and an abdomen in jailbird black-and-white stripes: Gaspard Auguste Brullé in 1846. There isn't a whole lot of information on the web about this species; this link is the best information I could find, and it's not much. From there I was able to find a Bulletin (216, 2) of the United States National Museum, that gives this info (spelling mistakes from the copy at archive.org):
Here's one last picture; the eyes in bright baby blue are captivating (too bad I couldn't get a good picture, but these wasps are in CONSTANT motion):Pimpla marginella Brullé, 1846, in Lepeletier, Histoire naturelle des insects, hymenopteres, vol. 4, p. 107; 9 . Type: 9 , Cuba (Paris). Front wing 4.5 to 8.0 mm. long; temple short, in a medium-sized female its profile about 0.4 as long as eye in profile; cheek short, in a medium-sized female about 0.85 as long as basal width of mandible; metapleurum with dense small punctures and hairs posteriorly and in its upper front corner, with moderately dense small punctures and hairs along its upper edge, the rest of its surface smooth and hairless. Fulvoferruginous. Pedicel reddish brown; flagellum brown, reddish brown basally; palpi brown; extreme hind corner of pronotum white; tegula white, its apical 0.5 ± dark brown; pleura tinged with white next to coxal attachments; first seven tergites black with an apical broad white band, the basal half of first tergite more or less ferruginous; abdomen of male blackish beyond seventh tergite, of female fulvo- ferruginous beyond sixth tergite, except for the apical white band on seventh tergite. Specimens: 2 c?, 9, Paradise Key, Fla., Apr. 9 and 12, 1951, H. and M. Townes (Townes). d", 39, Matheson Hammock, Fla., Apr. 9 and 11, 1951, H. and M. Townes (Townes). Also: 13 <? , 119, from Cuba, Haiti, and Puerto Rico. Our collections were from the undergrowth of the mixed hardwood forests known in Florida as "hammock." This species occurs in southern Florida and the West Indies.