I ill. I \1 \l \ I i i;i STAT] "I I 111. Ml't>\ \ I \ I , 



Length of Eull-grown nympha, 27 mm.; breadth, L2 mm. Length ol 



\ Olingj 9 to 25 nun. ; breadth, I In I I nun. 



This species is ool uncommon easl of the Mississippi, from Canada 

 bee) throughoul Maine, Vermont, Massachusetts, New York. Pennsylvania, 

 South Carolina, and Georgia, and in the Wesl Erom N. Illinois through Michi- 

 gan to Kentucky. Numerous specimens of the nympha have been studied. 

 Mus. Comp. Zool. 1 have never seen the imago from Texas, bul a uympha 

 from Mr. Stolley, and one in McLachlan's collection from Dallas, Texas, from 

 ,1. Boll, are undoubtedly M. transversa; lie has also the Texas imago from 

 thi' same locality. 



Body large, flattened, ovate; head somewhat villous, about half the 

 breadth of the abdomen, transverse-oblong, the breadth nearly twice the 

 length; the space between tin' eyes concave; tin- eyes nipple-shaped, 

 rather small, projecting backward ; part behind the eves larger than in 

 front, widely notched, sides bulging, villous, on each hind angle a very 

 small tubercle; in general the anterior part before the suture is sprinkled 

 with small tubercles and fine black dots; on each side a black band from the 

 hind angles to base of the eye A slight elevation on each side of the 

 median line, slightly depressed in the middle, is perhaps analogous to the 

 tubercles of Epitheca ; vertex small, round ; ocelli indicated ; anterior part 

 of head slightly hollowed, the anterior border with pyramidal horn, some- 

 what longer than the basal joints of the antennae, above thickly covered 

 with papillae-like Bpines. Antenna 1 short, first joint longer and thicker 

 than second; seta a little thinner: joints 3 to 7 of about equal length. I a 

 little shorter, 7 fine spindle-shaped. Mask large, strikingly spoon-shaped. 

 extending between the middle legs. Wing cases reaching sixth segment ; ab- 

 domen large, tlat. breadth three quarters of length, ovate, truncated af tip, the 

 outer edge very sharp; very slightly roof-shaped; segments equal, except 

 the last one, which is very short, and inserted in the ninth ; lateral spines on 

 segments 8 and 9 compressed, triangular, very sharp; short on 8, extend- 

 ing as far as appendages on 9, covered with short bristles, as are also the 

 margins of all segments ; dorsal books on segments l! to 9, thorn-shaped on 

 2 to 5; large, compressed, pointing backward on G to 9; anal appendages 

 forming together a pyramid, length less than breadth: hairy, sharp, the 

 dorsal median a very little shorter than the inferiors, and a little longer 

 than the laterals; ventral longitudinal sutures nearly straight, ending in the 

 apical angle of segment 9; lateral spaces nearly as broad as the median one ; 



