406 SAMUEL H. SCUDDER ON 



and one or two dividing simply beyond the middle; all of them are straight or very 

 slightly curved, the outermost extending far toward the tip of the wing, so as to give 

 this area an unusual preponderance; it occupies indeed about one-fourth of the wing. 

 The scapular vein runs subpai-allel to the costal margin in a straight course through the 

 middle of the wing to its extreme tip, so that this area and the mediastinal together oc- 

 cupy fully one-half the wing, dividing it between them by a straight and very oblique 

 line; this vein emits four or more long straight branches parallel to the outer mediastinal 

 branches, all of them, with the possible exception of an apical, forking once at or beyond 

 their middle. The externomedian vein begins to fork at about the middle of the wing 

 with dichotomizing branches which, however, do not separate widely and occupy on the 

 margin only the lower half of the broad apex; these branches cannot be called either 

 superior or inferior, as the forks part equally in opposite directions. On the inner margin 

 the internomedian area occupies less space than the anal, and is filled with a number 

 of closely approximate parallel veins scarcely curved and directed obliquely in an oppo- 

 site sense to those of the mediastinal area. The anal furrow is deeply impressed, broadly 

 curved, and strikes the middle of the inner margin. 



The wings are peculiar for their extreme breadth and rounded outline; the costal bor- 

 der is not greatly curved so that the tip of the wing is unusually blunt; they are broadest 

 ill the middle, and scarcely twice as long as broad. 



Besides the upper wings and the unusually broad pronotal shield, some few unimpor- 

 tant veins of the hind wings occur, but too insignificant to have any special value. 



The genus differs from Mylacris, with which it best agrees, in the form of .the wing, 

 Avhich does not taper apically but only has the tip rounded off, in the slight obliquity and 

 gentle curve of the anal fui-row, in which it resemljles Lithomylacris, and very strikingly 

 in the great extent and apical extension of the mediastinal area; in this latter point it 

 recalls somewhat the features of ISTecymylacris, but only superficially, as the veins all 

 originate and diverge from the base of the wing and show no tendency to simulate the 

 Blattinariae. In its great bi-eadth it is at once distinguishable from Lithomylacris, from 

 which it further differs in the lesser proportionate breadth of the combined mediastinal 

 and scapular areas. Its position in the system is indicated in the table of genera given 

 above. 



Two species are known. 



Paromylacris rotunda. 



PI. 32, figs. 1, 2. 



Paromylacris rotundum Scudd., Proc. Acad. Wat. Sc. Philad., 1885, 35. 



The front wing is obovate, scarcely narrower at tip than at base, barely twice as long 

 as broad, the costal border gently and regulai-ly convex, the apex broadly and regularly 

 rounded; transversely also the wings ai'c arched. The base of the wing is injured, but 

 the veins apparently originate in the very middle of the base, with little if any upward 

 curve at starting. The mediastinal area is very large, occupying half of the width of 

 the wing at base, and extending to the middle of the distal third of the wing apically; 

 the numerous veins of this area are traceable to about eight basal shoots, which radiate 

 considerably and not unfrequently fork singly (one is doubly forked), but there is a con- 



