532 BULLETIN UNITED STATES GEOLOGICAL SUEVEY. 



the basal one reduced to a spot in the middle of the extreme base, where 

 it occupies about one-third the width of the wing ; and the apical one 

 rather cloudy, half as broad as the breadth of the tip and as far from 

 the tip as from either border, equal, two or three times as broad as long, 

 sinuous or lunate; the other two are more distinct, with sharply defined 

 borders and irregularly sinuous ; the outer of the two traverses the 

 entire wing, touching the costal border, however, by only the tip of the 

 rounded extremity, while it expands upon the posterior border; the 

 inner of the two is rounded at either extremity, fails of reaching either 

 border, and is constricted just beneath the radial vein ; both of these 

 bands average in width the breadth of the interspaces. 



Length of body 23.5"'", oi[ head S.TS'""", of thorax 4.5"™, of abdomen 

 15.25"™; width of head 7""-, of clypeus 3.8"™; length of rostrum 8.5"™; 

 width of thorax behind 8.5'""'; length of scutellum 3"™, its breadth at 

 base 2.5"""; length of tegmina 29.5'""', width next base 10.5""", near 

 tip 8.5'"'". 



Petrolyntra heros. — A single specimen (No. 11,829) shows one of the 

 tegmina in a good state of preservation, together with both fore legs. 

 It was obtained at Florissant by Mrs. Hammon, and difi'ers from P. 

 gigantea in the broader bands of the tegmina and in the form of the 

 latter, the posterior border being slightly fuller at the base, so as to 

 make that part of the wing proportionally broader; while the posterior 

 angle of the tip is not obliquely excised, making the extremity docked 

 rather than pointed. The bands have expanded so as to occupy the 

 larger part of the wing; the basal spot occupies the entire base from 

 border to border, excepting the very root, as far as an oblique trans- 

 verse lice, subparallel to the inner basal edge of the wing, and distant 

 from the root nearly half the width of the wing; it also infringes upon 

 that bordering line by a large semicircular excision in the middle; the 

 apical spot is very nearly as long as broad, and stops just short of the 

 margin on all three sides of the apex, and in the middle of the wing 

 breaks through the intervening dark stripe into the outer of the two 

 middle bands; these two middle bands are also much broader than in 

 the other species, but not to so great a degree as the extreme bauds ; 

 they reach from border to border, and are united to each other and to 

 the basal spot along the sutura clavis; the wing, therefore, has the ap- 

 pearance rather of being pale, with three transverse dark stripes, which 

 are broad (and the outer two triangular) on the anterior half of the 

 tegmina, narrow, sinuous, and broken on the posterior half. 



Length of tegmina 28.25'"™, width at base ICS'""", at tip 7.2"'"', length 

 of fore femora 4.5"'"', fore tibiae 5"'"', fore tarsi 2.75"'"', first tarsal joint 

 O.S"""", last tarsal joint 1.7""", claws 0.5'"'". 



OrTHOPTERA: LiTHYMNETES {?u>%g, u/j.y7jT-^q). 



A stout-bodied genus of PhyllopJwrklw, probably belonging near Steiro- 

 don,hi\t differing from the entire series into whicjh Steirodon and its allies 



