SPECIES OF MYLACRIS. 309 



The species is a large one, the fragment measuring 24.5 mm. long and 12 mm. broad; 

 probably the entire length was not less than 28 mm., and the breadth to the length as 

 1 : 2.3. The wing is a right one, of which the under surface is shown in the figure and 

 the upper in its le>s complete counterpart. The veins are distinctly marked, and some- 

 what prominent on the under surface, excepting those of the internomedian area and all 

 the veins in the apical fourth of the wing; no cross veins or reticulation can be discovered. 



This species agrees with M. Mmsfieldii in its form and size and in the inferior origin of 

 the externomedian branches, but it differs decidedly from it, as well as from all other species 

 of the genus, in the sweep of the mediastinal and scapular veins, as well as in the exceed- 

 ingly restricted area they cover in the basal part of the wing. 



The specimen conies from Cannelton, Penn., and was kindly communicated by Mr. R. 

 D. Lacoe, in whose collection it bears the No. 2033. 



Explanation of Plate xxvii. 



[All the specimens are from the collection of Mr. R. D. Lacoe.] 

 Fig. 5. Mylacris ovale, f. No. 2033. Drawn with camera lucida by S. IT. Scudder. 

 Fig. 6. Mylacris carbonvm. \. No. 2022 b, from Cannelton. Drawn by J. S. Kingsley. 



Fin'. 7. The same. f. No. 2022 d, from Wilkesbarre. Drawn by the same. 



Fig. 8. Mylacris lucifugum. j. No. 2017. Drawn by the same. 



Fig. 1). Mylacris priscovolans. \. No. 2031. Drawn by the same. 



Fig. in. Mylacris carbonum. \. No. 2022 «, from Cannelton. Drawn by the same. 



Fig. 11. Mylacris pennsylvanicum. f. No. 2024. Drawn by the same. 



The other figures belong to the preceding memoir. 



