In a previous part of this series (Carpenter, 1983) I discussed the structure and relationships of the extinct family Eubleptidae and its unique generic representative, Eubleptus danielsi Handlirsch. This was based on my study of the 17 specimens of the insect then known, all from the Upper Carboniferous of Mazon Creek, Illinois. Since then, Mr. Michael A. Madsen, of Darien, Illinois, has kindly loaned me for study a well-preserved specimen of a new species also belonging to Eubleptus. Since

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... s contributes considerably to our understanding of the family, I am describing it here. Family Eubleptidae Handlirsch, 1906 Eubleptus maculosus n. sp. Figures 1-4 This species is similar to danielsi, so far as known. Both species have the same basic pattern of venation in fore and hind wings, but in maculosus the wings are more slender and the points of origin of RS and of the forking of M are much nearer the center line of the wings. Also, MA in both fore and hind wings is unbranched in maculosus but deeply forked in danielsi. Of special interest is the presence of four large, dark, submarginal spots extending to midwing in both fore and hind wings of maculosus, in addition to certain other spots along other main veins. In danielsi both wings have four dark spots on the anterior margins, but none on the rest of the wings.