336 SAMUEL H. SCUDDER ON THE 



This specimen is one of the most beautifully preserved of the fossil insects in nod- 

 ules which I have seen. It was sent me for study by Dr. Jasper C. Winslow of Danville, 

 111., to whom it belongs, and was found by him on Little Vermilion River, about four miles 

 above Georgetown, Vermilion Co., 111., in a carboniferous deposit. It is referred to as 

 a species of Miamia in the Geology of Illinois, vol. iv, p. 253, where the relation of the 

 deposit to the region is explained. The drawing by Mr. Blake is a very perfect represen- 

 tation of its ajipearance. 



Dieconeura ( Si^W, vtOpov) gen. nov. 



The wings of this genus are long and slender, largest beyond the middle. The medias- 

 tinal vein strikes the scapular vein considerably beyond the middle of the w;n<>\ while the 

 main branch of the latter, bearing two or more simple or forked branches, which fill 

 the whole apex of the wing, arises in the middle of the basal half of the wing. The 

 externome lian vein is simple. The internomedian vein is very long, reaching nearly to 

 the extremity of the lower margin, and sending at equal distances a number of simple 

 oblique branches to the border. The anal vein with its branches occupies the basal third 

 of the lower margin. 



The simple externomedian vein, combined with the importance of the internomedian, are 

 the striking features of this genus. 



Dieconeura arcuata sp. nov. PI. 30, fig. 4. 



The scapular branch begins to fork beyond the middle of the wing, and is connected near 

 here by an oblique cross vein to the externomedian vein, which is at first straight and 

 divides equally the broad space in the middle of the wing between the scapular branch 

 and the internomedian vein, but afterwards curves downward following the course of the 

 extremity of the internomedian vein. The latter is strongly sinuous, taking at first a 

 nearly straight course as if it would terminate at about the middle of its actud area, then 

 curving upward into close proximity to the base of the first offshoot of the scapular branch, 

 and then turning to its former course, but arcuate ; the main stem is bordered throughout 

 by a dusky band intensifying its otherwise striking character. The abdomen is long and 

 slender, the joints of nearly equal length and breadth. Langth of thorax and abdomen 29 

 mm., of front wing 30 mm., width of same, 7.25 mm. 



Carboniferous beds of MaZon Creek, 111. Mr. R. D. Lacoe, No. 2043. 



Dieconeura rigida sp. nov. PI. 29, fig. 10. 



All the veins are remarkably straight and stiff. The mediastinal strikes the scapular 

 vein at an acute angle without bending down to it. The scapular branch has few and 

 distant branches (two only are seen), the first arising far before the middle of the wing and 

 forking near the origin of the second branch below the union of the mediastinal with the 

 scapular vein. The externomedian vein is perfectly straight, filling the equal space 

 between the internomedian vein and the scapular system. The internomedian vein is 

 slightly bent near the middle of the wing and its simply oblique branches are slightly 



