LAWSON: KANSAS CICADID^. 315 



A A. Small species; uncus wishbone shaped. 



B. Orange and black species; arms of uncus strongly curved and 

 widely separated apically, arms of ventral piece stout when 

 viewed caudally. cugraphica. 



BB. Green and black species; arms of uncus straighter and not 

 as widely separated apically, arms of ventral piece slender 

 when viewed caudally. vitripennis. 



Tibicen bifidus (Davis). 



(PI. xxi, figs. 1-2; pi. xxv, fig. 4; pi. xxvi, fig. 9; pi. xxvii, fig. 13.) 

 Cicada bijida Davis, Jl. N. Y. Ent. Soc., xxiv, p. 47, 1916. 

 Tibicen bifidus Van D., Cat. Hemip. N. A., p. 489, 1917. 



A black and yellowish-brown species of medium size. Specimens at 

 hand measure from 25 to 29 mm. 



Color: Head black, with the following marked with yellowish-brown, 

 sometimes tinged with green: The antennal ledges, a triangular spot in 

 front of ocelli, a spot of varying size just in front of this, and irregular 

 spots along the caudal margin laterad of the ocelli. Pronotum yellowish- 

 to brownish-green, pruinose in spots, with a large black median T-shaped 

 or triangular spot extending from the collar to the head, which often con- 

 tains a yellowish-green spot. The grooves are blackened in varying de- 

 gree and often have black spots between them. Collar with black spots in 

 the humeral angles and often some between these and the median spot. 

 Mesonotum black, often pruinose in spots, with the W-shaped mark and 

 the sides yellowish-green, as is also the cruciform elevation, the anterior 

 arms of the latter almost touching the W. Abdominal terga black with 

 the sides brownish-yellow, the last tergum being almost wholly light, with 

 a faint dorsal row of pruinose spots and often with pruinose markings 

 laterally. Wings with the branches of the veins nearly all black, the 

 costal margin and the bases of the veins, radius and extreme base of 

 media excepted, yellowish-brown; cross veins between R, and R* + 5 and be- 

 tween latter vein and Mi distinctly darkened. Basal areoles of fore 

 wings with dark dash; flaps of both wings whitish, those of fore wings 

 often with an orange tinge. Beneath nearly unicolorously yellowish- 

 brown except for darker head. Legs, especially prothoracic pair, streaked 

 with dark. 



Form : The following are the measurements in millimeters of the speci- 

 mens at hand: 



Length of body 25 to 29 



Width of head 9 to 9.5 



Expanse of fore wings 71 to 74 



Greatest width of fore wing 11.5 to 12.5 



Greatest width of operculum 6 



Greatest length of operculum 9 



The opercula are fully half as long as the abdomen, overlapping nearly 

 two-thirds their length, then evenly narrowing on both margins to the 

 subacute apices. 



Genitalia: Supra-anal plate of male with small, stout, median process 

 and with the lateral angles rounded. The uncus, when viewed laterally. 



