68 ENTOMOLOGICAL NEWS. [March, 



Pausing now to discuss these differences, 



I have not found any variations in the statements for characters numbered 



1 to 5 ; this, of course, is merely another way of stating that I have taken 

 the superior appendages as the chief specific characters, a course which I 

 believe is fully justified by the material studied. 



For No. 6, one male fraternus, Ind., had the divergence greater, 

 although not as great as in e.i'fertms, thus representing a variation of 5 ' , 

 while two males crassus, Ohio, had the divergence no greater than that 

 of the superiors (10'^ ). 



No. 7 : the edge but very slightly longer than either branch i ^frater- 

 nus, Ark. (5 f / f ). 



No. 8 : in i 9 fraternus. Ark., not quite contiguous (6'v ); 10 9 9 fra- 

 ternus have the angle of divergence of the tips 90, 799, mostly Ind., 

 about 60; for externus i 9, 111.?, is distinctly like fraternus with the 

 angle of divergence 90, i 9* has the tips slightly divergent at about 60. 



No, 9. fraternus: absent i9, Ark., only a trace present i 9. Ohio, 

 extends to basal three-fourths i 9, HI. ; well developed in i 9 e.vtenius* 



No. 10 : not interrupted in 5 fraternus (3 r 71 Ohio, Ind., III., i o 7 i 

 Ark.) (13 '' f ), interrupted in i 9 e-\'ft'riins % , barely interrupted i ,^ cmssns, 

 Ohio. 



No. n. Fraternus: i 9 Ind., i 9 Ark. spines absent, i 2 Ind. spine 

 absent on right side, rudimentary on left (total \~i l / 2 '</ ); marked difference 

 in length of right and left spines i 9 Ohio ; spines black in 8 9, yellow in 



2 9 111. 



No. 12 : a yellow stripe or line in 7 fraternus (i8'/ ), viz. : on the basal 

 third of ist and 2nd, basal fourth of 3rd tibiae, 3 $, 111., Ind.; on the basal 

 fifth of 3rd tibire only 2 $ 111., i 9 Ohio ; on basal half of all tibise, i ^ 

 111. In e.rter/ius this stripe may be almost as long as the tibue, 3 9 HI. ; 

 or on the basal two-thirds of the ist, basal half of 2nd and 3rd, i o 7 ' i 9 

 111., i 9 Tex.; or on the basal half of the ist tibiae, basal third of 2nd and 

 3rd, 3 ^ 111.; or on the basal half of 3rd tibiae only, i 9-~"~ 



The differences between these three species which have thus 

 far been considered are subject at the most to a variation of 20 

 per cent, and can, therefore, be considered specific, although to 

 varying degrees. I have also compared these three species a> 

 regards a number of other structural and colorational differences 



This female, which I have included in c.vtcnnis because it agrees in 

 characters Nos. n and 12, occupies quite an intermediate position since 

 it has character 8 like both e.\~fernns and fraternus, 9 as in 'fraternus and 

 10 as in crassus. It was marked as having been taken in copula with a 

 ? which I unhesitatingly name fraleriins ; the locality is probably Illinois, 

 the date June 29, 1895. I think it quite likely that this female may be a 

 hybrid. 



