26 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



Remarks. — T. diducta and T. eriodictyonis are closely related struc- 

 turally, although appearing very unlike in their extremes of colora- 

 tion. The paler specimens of diducta are hard to distinguish from 

 the darker specimens of eriodictyonis. Both have a broad shining 

 prothorax, which in eriodictyonis is usually quite angulate, while in 

 diducta it is arcuate or very obtusely angulate. A short, blunt-tipped 

 aedeagus is common to both. Both occur on the same food plant, 

 Eriodictyon (Hydrophyllaceae). I have found one other species, 

 T. -fiavolhnhata^ in small numbers on Eriodictyon., although its pre- 

 ferred food plant is Baccharis pilularis De Candolle. T. diducta 

 can be separated from nitidlcoUis not only by the peculiar short 

 aedeagus but also by the oblong shape of the occipital spot and tiie 

 less angulate prothorax with usually larger spots. 



15. TRIRHABDA LUTEOCINCTA (LeContc) 



Plate 2, Figure 15 



Galleruca luteodncta LeConte, Proc. Acad. Nat. Sci. Philadelphia, vol. 4, p. 8S, 



1858. 

 Trirhabda luteodncta LeConte, Proc. Acad. Nat. Sci. Philadelphia, vol. 17, 



p. 220, 1865. 



Description. — Large, elongate, robust, pale with dark metallic 

 luster on upper portion of head, large shining dark spots with green 

 luster on prothorax, and green, blue, or nearly black elytra, these 

 infrequently vittate. Head rather finely but densely punctate and 

 covered with long white pubescence over occiput; a wide, shining 

 dark metallic plaga across base of head, curving down well over 

 front, and frequently a spot on margin of eyes in front. Antennae 

 with third joint shorter than fifth. Prothorax scarcely twice as 

 broad as long, with obtusely angulate margins, and with scattered 

 coarse punctures, occasionally a light pubescence more conspicuous 

 on sides, very shining, 3-spotted, the spots very large and with 

 metallic blue or green luster. Scutellum usually black, except in 

 vittate specimens, then bicolored. Elytra shining, moderately 

 coarsely punctate and with long, pale, silky pubescence, and, except 

 for pale margin, usually dark green, blue, or violet, appearing nearly 

 black, sometimes with a pale median vitta on each elytron extending 

 well down and sometimes reaching apex. Body beneath with abdo- 

 men and sides of metasternum dark with metallic luster, outer edge 

 of femora dark green. Length, 8.5 mm. to 10.5 mm. ; width, 3 mm. 

 to 4 mm. 



Type locality. — " San Diego, also Santa Cruz, Calif." 

 Distribution. — California (Orange County, Los Angeles, Ventura, 

 Santa Barbara County) . 



