1919.] NATURAL SCIENCES OF PHILADELPHIA. 97 



size decreasing as one passes into higher country and northward 

 toward the northern limit of its distribution. The material from 

 West Point, Nebraska, northeastern Kansas and southeastern 

 Iowa is very small, while that from elevated localities in Ala- 

 bama, Oklahoma and Texas (i. e., Chehawhaw Mountain, Moun- 

 tain Park and Shovel Mountain) is relatively small. Regarding 

 the size variation in material from the eastern coast we can say 

 but little, as the most northern material known from that region 

 (Havelock, North Carolina) is not now available, and we possess 

 a fair series from but a single definite locality — Lane, South Caro- 

 lina. The latter shows equally small size when compared with 

 material from the more northern points in the Mississippi Valley 

 and interior region. 



Color Notes. — The present species shares with AI. texana the 

 distinction of having a more fixed color pattern than the other 

 species of the genus. The one striking feature of color difference 

 is a sexual one and it is, as far as the material before us goes, abso- 

 lutely constant. In the female sex the subcostal stripe is strongly 

 indicated and relatively broad, while in the male it is entirely 

 absent, the species being unique in this respect. The postocular 

 bars are pronounced in both sexes, in the female almost never, 

 and in the male usually, encroaching on the dorsum of the meta- 

 zona; never, however, to the extent frequently found in maculi- 

 'pennis, and then generally in a dilute intensity. Very rarely 

 is a medio-longitudinal bar present on the dorsum of the head 

 and pronotum, and then it is generally limited to the head, made 

 up of separate points and divided in two by a hair line of the gen- 

 eral color. In certain specimens of the series in hand the medio- 

 longitudinal line is indicated on the pronotum as well as on the 

 head, and in those cases it is formed by an infuscation of the median 

 carina. Rarely (three males: "Georgia," Chehawhaw Mountain, 

 Alabama; three females; Lane, South Carolina) the median carina 

 of the pronotum is distinctly hair-lined with fuscous, while the 

 head has almost no indication of a line. Invariably the anal 

 area of the tegmina, suturad of the last axillary vein, is of the pale 

 dorsal color. 



The pale base coloration of the male ranges from citron yellow 

 (on the abdomen mustard yellow), through yellowish citrine to 

 oil green, with a few specimens (all from Texas) ochraceous-buff 

 to buckthorn brown. The majority of the Texan males are reed 

 yellow. The pale base coloration of the female ranges from citron 

 7 



