CLASSIFICATION OF PALEOZOIC INSECTS. 331 



the right wing, showing it to be 10 mm. broad ; the length of the larger fragment is 20 

 mm., and the probable length of tlie wing about 35 mm. 



Coal measures of Vermilion Co. Illinois, obtained and sent to me by Mr. Wm. Gurley. 



Homothetus Scudder. 



The characters of this genus having been misapprehended by me in my detailed paper 

 on the "Devonian Insects of New Brunswick," I have given a revision of them in a recent 

 paper on "The Earliest Winged Insects of America." The genus is remarkable for the 

 length of the mediastinal vein, which is scarcely shorter than the scapular, for tiie absence 

 of oblique branches of the same, for the absolute simplicity of the scapular vein, and for 

 the small importance of the externomedian vein, which has only a few oblique generally 

 simple branches occupying the apex of the wing. 



Homothetus fossilis. 



Homothetus fossilis Scudd., Dev. Ins. New Brunsw., 17, pi. 1, figs. 1-2. Earlier refer- 

 ences may be found in the synonomy there given. 

 Devonian beds of St. John, N. B. 



Mixotermes Sterzel. 



This genus, considered by Sterzel, not without some reason, as one of the Termitidae, 

 seems to find its place here. Probably the mediastinal vein will be found to reach the mar- 

 gin not far beyond the middle of the wing, where the scapular vein, otherwise simple, first 

 begins to send short branches to the border. The structure of the externomedian vein 

 precisely accords with this family. What Sterzel considers the lower branch of the exter- 

 nomedian is probably the internomedian vein, while at least the lower of the veins con- 

 sidered by him as internomedian should be considered as anal. 



Mixotermes lugauensis. 



Mixotermes lugauensis Sterzel, Ber. naturw. Gesellsch. Chemn., vn, 273-276, pi., fig. 3-5. 

 Carboniferous deposits of Lugau, Germany. 



Omalia Coem.-Van Ben. 



Probably this form belongs here but the original needs a new study, as its curious 

 venation is plainly impossible and no sufficient description has ever been given. 



Omalia macroptera. 



Omalia macroptera Coem.-Van Ben., Bull. Acad. roy. Belg., (2), xxiii, iv, 384-401, pi. 

 Carboniferous deposits of Sars Longchamps, Belgium. 



Palaeopterina Scudder. 



Wings obovate, several times longer than broad, the mediastinal vein of front pair ter- 

 minating, usually not far from the middle of the wing, by running into the scapular vein. 



