Studies on North American Carboniferous Insects. 1. The Protodonata

Protodonata 99 R3 is not preserved in the fore wing but in the hind wing it is clearly visible and is associated with the oblique cross-vein (Sn) characteristic of most Meganeuridae (Carpenter, 1947, p. 47); the cross-vein is not so pronounced as it is in permianus, however.The differences between the fore and hind wings in the proximal region are like those in other species of Typus.Holotype: U. S. National Museum, Washington, D. C. The specimen (field number 8758) was collected in May, 1939, by Mr. Charles B. Read at Durham, Georgia, the locality data being "Catoosa (TVA.Durham Quad.), Williams Coal Company Mine in No. 4 Coal.Plants from roof shale."According to Butts' account of the stratigraphy of the Paleozoic area in northwest Georgia (Butts and Gildersleeve, 1948, pp.54-56), the coal mines at Durham are in the Walden sandstone part of the Pottsville Series.Butts states that "according to the best knowledge, the Pottsville Series of Georgia is of Lower Pottsville age and falls within the limits of the Lee Con- glomerate of Tennessee and Virginia and corresponds approximately to the lower part of the Pottsville of the anthracite coal fields of Pennsylvania which carry the Lykens number 4 and 5 and the Lykens Valley coals."A brief discussion of the nature of the .no. 4 coal at Durham is contained in Gildersleeve's account (ibid., 1948, p. lO4) of the mineral resources of the Paleozoic area in northwest Georgia.