EDMUND H. GIBSON 103 



membranous margins and nervures rather long. Costal margin of elytra 

 nearly straight. Size, 3 mm. long, 1.7 mm. wide. 



General color above white. Crest and median carina of hood embrowned. 

 Tumid elevations of elytra embrowned posteriorly and nervures on apical 

 portion of elytra more or less yellow or embrowned. 



Type. — 9 , Los Angeles, California. (Collection of United 

 States National Museum.) Allotype. — d^ , Chico, California. 

 (Collection of United States National JVIuseum.) Paratypes. — 

 Two females, one from Chico and one from Santa Barbara, Cali- 

 fornia, also in collection of United States National Museum. 



Many other specimens from California and ]\Iexico have been 

 examined. This has previously been determined as a western 

 form of ciliata Say, but the author considers it a distinct species 

 separable from ciliata by distinct color markings and smaller size. 

 Sj^camore is the food plant of this species. 



54. Corythucha inunaculata Osborn and Drake 



1916. Corythucha immaculata Osborn and Drake, Ohio Journal Sci., xxvii, 

 no. 1, p. 11. 



Hood somewhat higher than median carina, but not twice as high, height 

 equals more than one-half its length. Length of hood shorter than median 

 carina. Median carina well arched with two rows of areoles. Lateral carinae 

 large and long, terminating near to base of hood. Costal margins of elytra 

 straight. Tumid elevations of elytra well rounded. Reticulations of hood 

 only slightly larger than those of paranota. Spines on membranous margins 

 and nervures normal in size and number. Size, 4.1 mm. long, 2. .5 mm. wide. 



General aspect above pure white, immaculate. Sometimes appearing cream 

 yellowish, especially with old specimens. No brown markings. 



A paratype from Alameda, California, in the Drake collection, 

 has been examined, and also several other specimens from Wash- 

 ington, Oregon and ^Montana. Greatly resembles pura Gibson, 

 but may be distinguished from it by the larger reticulations of 

 the hood, spines shorter, and larger in general size. 



Food plant unknown. 



55. Corythucha pura Gibson 



1917. CorylhucJta pura Gibson, Ent. News, xxviii, no. 6, p. 258. 



Pronotal hood higher than median carina, but less than twice as high, its 

 height nearly two-thirds the length of the head. Length of hood equals length 

 of median carina. Hood constricted at middle, globose portion wider than 

 long and more or less flattened posteriorh'. Reticulations of hood small, 

 about same size as those of paranota. Median carina with two distinct rows of 

 areoles. Lateral carinae high, long, with areoles, and terminating close to 



TRANS. AM. ENT. SOC, XLIV. 



