CARBONIFEROUS COCKROACHES. 411 



A portion of one of the hind wings also shows between the partially opened fore 

 wings, and some few veins of a hind wing appear mixed with those of the right fore 

 wing. Little can be determined from these fragments, for to judge from the first, the 

 hind wing must have been of the same length and very much indeed of the same form 

 as the fore wing, with a similar distribution of veins; while to judge from the latter, in 

 the position it holds, the neuration must have been very much more developed iu certain 

 areas. 



This insect is more nearly allied to E. lesquereuxi than to any other species, but dif- 

 fers from it in many featui-es, such as the equahty of the mediastinal area, its more fre- 

 quent veins, the greater regularity of the scapular branches, and especially the earlier 

 divarication of the externomedian vein, Avith its consequently larger area, as well as the 

 general disposition of its branches. It is also allied, but not so closely, to B. mazona, 

 a smaller species, differing from it in a shorter and more uniform mediastinal area, a dif- 

 ferent distribution of the veins of the scapular vein, an earlier divarication of the exter- 

 nomedian vein, and, apparently, a mnch shorter internomedian area. 



The specimen is preserved with some of its natural brownish coloring on a light clay- 

 colored stone, and the better half shows a deep impression of the anal area which must 

 have been well vaulted; the other half, showing the upper surface, is not so well pre- 

 served. It comes from the old Fair ground at Lawrence, Kansas, and was sent me for 

 examination by Mr. R. D. Lacoe, in whose collection it bears the number 20J:5ab. 



Archimylacris paucinervis sp. nov. 

 PI. 31, flg. 5. 



The fore wing is long and rather slender, nearly equal, the costal marg*n, however, 

 somewhat and rather regularly convex (too convex upon the plate), the inner margin 

 straight throughout the greater part of its course, the tip somewhat tapering, a little pro- 

 duced and rounded; the broadest imvt of the wing is near the middle or a little before it. 

 The mediastinal vein runs in a nearly straight course, very nearly to the end of the sec- 

 ond third of the wing, and emits a considerable number (fi'om eight to ten) of mostly 

 forked or doubly forked branches; they differ a little in the two wings, that of the right 

 wing having a fewer number of branches, and they are also more regularly bi-anched; 

 the greatest width of the area is considerably less than one quarter that of the whole 

 wing. The scapular vein runs in a nearly sti-aight line toward the outer margin which 

 it nearly reaches a little befoi'e the tip, and then curves a little downward to terminate 

 on this margin a very little before the tip; with its branches it occupies a narrow wed<>-e- 

 shaped area which at the tip of the wing is scarcely more than half its breadth; it emits 

 at the end of the first third of the wing a single branch at a slight angle, which bears all 

 the other branches, excepting a few, mostly simple, short branches which separate from 

 the main stem near its tip upon the upper side, filling the space left unoccujned by short 

 branches beyond the tip of the mediastinal vein; this pi-incipal branch reaches the apical 

 margin a little below the apex of the wing and acts differently in the two wings : on the 

 left side it emits two su[)erior branches near together near the end of the second third of 

 the wing, the first simple, the second forked near the tip; on the right wing it forks a 



