June-Sept., 1919.] D.WIS : ClCADAS. 199 



notum shining black, slightly bluish, with the sides and posterior margin 

 orange ; the front margin sometimes narrowly edged with orange. Meso- 

 notum shining bluish black bordered on the sides posteriorly with orange. 

 The elevated X has the fore limbs touched with orange, in front of which are 

 the usual four orange spots arranged in a semi-circle. In some of the darker 

 specimens from Oregon the mesonotum is more nearly black. Metanotum 

 black edged posteriorly with orange. Tergum shining black, with the same 

 slightly bluish tint of the parts already described; the segments very nar- 

 rowly edged posteriorly with orange, the orange most conspicuous at the 

 sides. In some of the Oregon specimens the tergum is nearly all black. 

 Uncus black. Beneath, the legs are orange blackened at the joints and con- 

 siderably blackened on the inner side of the fore femora. The abdominal 

 segments .are blackened centrally, orange on the posterior margins, also with 

 a black spot on each segment at the sides. Valve black, sometimes orange at 

 the sides along the upper margin. In some of the specimens from Colorado 

 the valve is entirely orange. 



Measurements in Millimeters. 



Male Female 



Type. Allotype. 



Length of body 25 23 



Width of head across eyes 6.5 7 



Expanse of fore wings 58 62 



Length of valve 5 



Some of the paratypes represent a darker race, blacker on the 

 legs, and in the fore wings the costal margin is not as conspicuously 

 orange. 



This insect has generally been considered the Cicada rimosa of 

 Say, but that species is duller colored and appears to be more eastern 

 in its range. 



The following specimens of Okanagana bclla have been examined: 



Utah. — Logan, June 10, 1904, male; July 4, 1904, two females; 

 June 22, 1906, four males, two females ; Logan Canyon, June 19, 1909, 

 three males and two females; July 4, 1909, two females, from col- 

 lection Dr. E. D. Ball. Garland, June 11, 1904, male; June 18, 1904, 

 male and two females, collection Dr. Ball. Wellsville, July 3, 1904, 

 female, collection Dr. Ball. Salt Lake City, June 8, 1902, male, and 

 June 15, 1902, male, Davis collection; male and two females without 

 date labels (Dr. Henry Skinner), collection Acad. Nat. Sci., Phila- 

 delphia. Silver Lake, July (Dr. Skinner), collection Acad. Nat. Sci., 

 Philadelphia. Mill Creek, June 20, 1906, two females (E. G. Titus), 



