214 Sellards — Structure of Paleozoic Cockroaches, 



specimens to have a shape different from those of Etoblattina, 

 being pointed instead of rounded posteriorly. Spiloblattina 

 has not been previously recognized in the Coal Measures, the 

 type having come from deposits which are either Triassic or 

 Permian, but an examination of some Coal-Measure forms from 

 new material convinces the writer that the genus is represented 

 in these formations. In describing the cockroaches from Rich- 

 mond, Ohio, Professor Scudder noted that some of the species 

 approached closely to Spiloblattina, remarking that the dispo- 

 sition of the media and cubitus of Etoblattina ramosa is 

 " much after the fashion of Spiloblattina" A reexamination 

 of Etoblattina maledicta, a closely related species, leads to its 

 reference in the present paper to Spiloblattina. 



Spiloblattina maledicta. Plate I, Figures 5, 6, and 10; Text- 

 figures 26 and 27. 



Etoblattina maledicta Scudder, Bull. U. S. Geol. Surv., No. 124, p. 83, pi. 

 6, figs. 1-3, 1895. 

 Etoblattina benedicta Scudder, ibid., p. 84, pi. 5, figs. 14-15. 



Tegmina narrow, two and one-half times as long as broad, 

 costal border slightly arched, inner border nearly straight ; 

 tegmina broadest at the extremity of the anal area, apex 

 obtuse. Subcostal area narrow, extending a little beyond the 

 middle of the tegmina; branches mostly simple and oblique. 

 The radius reaches nearly to the apex. The first branch is 

 given off at about the extremity of the basal third, sometimes 

 as early as the end of the basal fourth, and is usually twice 

 forked. Three or four other simple or deeply forked branches 

 pass to the border. The media gives off its first branch some- 

 what beyond the middle. The main vein and its branches fill 

 the apex. The cubitus varies in extent, either reaching well 

 on to the apical margin, its greatest extent being obtained by 

 an outward curve near the termination, or, lacking the curve, 

 ending short of the apical margin. The first five or six branches 

 are straight, mostly simple, and parallel ; the others are more 

 oblique, not uniform in number, curved, and sometimes forked. 

 The anal area extends approximately to the end of the basal 

 fourth, is clearly marked off, and has six or seven mostly simple 

 veins. The main veins of the wing originate close together 

 somewhat above the middle of the base. The veins diverge in 

 the central part, enclosing elongate, light-colored areas. The 

 tegmina are delicate and thin, the veins thin, although appear- 

 ing heavy in places because of the dark-colored bands accom- 

 panying them. The alternate light and dark areas give the 

 wing a striking appearance (Figures 5, 6, Plate I). A dark 

 band extends along the costal border obscuring the tips of the 



