342 



3. C. dorsata. 



Cicada dorsata, Say, Journ. xicad. Pkila. iv, 331, No. 3. 



This is the grandest and most beautiful of the large western species 

 of Cicada. Its note is said to be load, piercing, and sustained, and 

 from the great strength of the base of the wings and their fasciculse of 

 muscles the species must be one of the most vigorous and rapid in flight. 



The specimens here noticed were collected in Colorado by Prof. C. 

 Thomas. 



4. C. canicularis. , 



C. canicularis, Harris, Insects of Mass. 217, fig. 83. 



From the mountains of Colorado. The specimen corresponds in size, 

 structure, and markings with those from Eastern Massachusetts and 

 other parts of IsTew England. IsTew Jersey seems to be the region where 

 it varies most in size and kind of marking. 



5. C. hesjjeria. New sp. 



Form and general appearance of C. rimosa. Fusco-piceous, or, when 

 less mature, dull ochreous ; the surface generally invested with yellow- 

 ish prostrate pubescence, the sutures and depressions with erect pubes- 

 cence. Head narrower than the front of pronotum; face densely pubes- 

 cent; the outer margins, central line, orbital prominences, and basal 

 joint of rostrum orange-yellow; frontal ridge and lower part of cheeks 

 coated with prostrate pubescence; the outer region of the cheeks having 

 long hairy pubescence. Eostrum reaching to the intermediate tro- 

 chanters. Cranium with dense prostrate pubescence; central longitudi- 

 nal line impressed; running from the ocelli each side obliquely is a simi- 

 lar impressed line ; suprafrontal space tabulate, depressed, having the 

 central ocellus deeply seated in a large lunate excavation. Antennae 

 black. Pronotum obliquely narrowing and declining anteriorly; the 

 lateral and posterior margins yellow; oblique impressions each side of 

 disk ochreous; anterior margin and posterior submargin linearly ele- 

 vated; the posterior margin broadly 'sinuated each side; the posterior 

 angles produced obliquely, and elevated in a broad flap with rounded 

 angles, the surface of the flap obliquely striated; lateral margin in front 

 of the flap sinuated, directed downward; anteriorly to this the margin 

 proceeds upward, and is tabular as far as to the angularly-toothed ante- 

 rior angle. Mesonotum smooth; the latero-posterior margins sinuated, 

 yellow; the disk is marked with four angular yellow spots. Wi&g- 

 covers infuscated on the basal half, the nervures fuscous, and the pos- 

 terior basal flap bright red; costal edge yellowish; wings at base and 

 nearly the whole of the basal flap red; beyond the base, the nervures 

 are more or less bounded with fuscous. First apical areole shorter than 

 the second, and about half as wide, elongate-elliptical, acute at both 

 ends. Pectus pale yelloAvish ; disks of the pleural pieces blackish. Legs 

 testaceous, but more or less suffused with piceous, particularly upon the 

 tarsi and upon the anterior pairs of femora. Tergum yellow on the 

 posterior margin and sides of the segments, excepting the basal one; 

 venter, excepting the base, but including the genital covers, testaceous. 

 Apex of the last ventral segment bilobate. Posterior margin of the last 

 tergal segment subentire. Penis-sheath elliptical, narrowed, and sin- 

 uated each side from beyond the middle to the tip, the apex curved 

 downward : inferior genital-cover rounded at base, acutely tapering at tip. 



