Vol. Xxiii] ENTOMOLOGICAL NEWS. 99 



sive posterior and ventral pale thoracic areas of the Indiana 

 specimen are represented in the other by a uniform black, with 

 two very narrow pale lateral stripes. The mouth parts and 

 bases of the legs in the Wister specimen are black and with- 

 out markings, while they are varied with yellow in the other. 

 The abdomen is also much darker, and without trace of mark- 

 ings in the Wister specimen. 



The above described Wister specimen has the most reduced 

 colored wing areas of any specimens seen from this locality. 

 From this extent of color areas a continuous series is shown 

 up to an extent corresponding about to Calvert's fig. 5, plate 

 3, Biol. Centr. Am. Neur. — that is, with the pale area of hind 

 wing measuring about 7 mm. in length. As mentioned above, 

 brown membrane exists in the front wing at least anterior 

 to A and across the wing distal to the quadrangle. Where 

 these areas of brown membrane show red or reddish, it is 

 due to the veins and membrane immediately adjoining them. 

 Hence the enclosure distally of the red area of the front wing 

 by brown introduces no new character in the wing, but is mere- 

 ly an extension of the brown area there, as in the hind wing, 

 beyond the area of red veins. In those specimens showing 

 maximum development of brown beyond the red areas occurs 

 the maximum development of brown membrane within the red 

 areas, and, in the front wings, the area posterior to A and 

 proximal to the distal end of the quadrangle may be invaded. 

 Two males from Clifton, Texas, are fairly intermediate in 

 body markings between the Indiana and Wister, Oklahoma, 

 specimens. Compared with two males, one from Tennessee, 

 the other from Pennsylvania, they are smaller, darker and 

 with more extensive colored areas on the wings. Six males 

 from Black Bayou,* Texas, are similar to the Clifton males, 

 and indicate that, to a certain degree at least, the extent of 

 black laterally on the thorax is determined by age as well as 

 by habitat. For example, a teneral male from Black Bayou 

 suggests a fully matured male from Pennsylvania. 



* Near Victoria, where St. L. B. and Mex. R. R. crosses the Guada- 

 lupe River. 



