28 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 79 



than that of luteocincta. It is also smaller and of paler coloring. 

 The pronotal spots are never very large and are usually piceous. It 

 ranges farther inland and northward than luteocincta. T. 

 ■fiavolimhata is more oval, usually not so long and parallel in shape, 

 and has more coarsely punctate, less pubescent elytra, and usually 

 a wider occipital band. 



17. TRIRHABDA LABRATA Fall 



Plate 2, Figure 17 

 Trirhahda labrata Fall, Can. Eut., vol. 39, p. 242, 1907. 



Description. — Medium sized, parallel, pale with brilliantly shining 

 green or blue-green markings, a wide plaga over base of head, very 

 large contingent spots on pronotum, and elytra, except for margin, 

 unicolorous. Head obsoletely and confluently punctate, nearly 

 smooth, and lightly pubescent, a shining wide green plaga across 

 base of head, extending well down front and in some specimens en- 

 circling eyes, labrum dark. Antennae with third joint shorter than 

 fifth. Prothorax barely twice as broad as long, with arcuate, some- 

 times obtusely angulate sides, very shining, with scattered coarse 

 punctures; spots large, often touching and with metallic luster. 

 Scutellum black. El}i:ra coarsely, densely, and rugosely punctate, 

 with short, inconspicuous, and sj^arse pubescence, very shining and 

 entirely green or blue-green except for narrow pale margin. Body 

 beneath pale with metasternum and abdomen except for last seg- 

 ment dark metallic green; outer femora and tibiae and occasionally 

 tarsi also dark. Length, 6 mm. to Y.5 mm. ; width, 2 mm. to 3 mm. 



Type locality. — Monterey, Calif. 



Distribution. — California (Monterey, Guadalupe). 



Food plants. — Aplopappus ericoides (Lessing) Hooker and 

 Arnott (D. H. Blake), '"'■ Biglovia sp." {= Aplopapjyus sp.) (Blais- 

 dell), chamiso, Adenostoma fasclculatum Hooker and Arnott 

 (Coleman). 



Remarks. — T. lahrata., while very closely related to luteocincta.^ 

 is a much more brilliant species on account of its very scant pubes- 

 cence and its broader markings with lustrous green or blue-green 

 metallic coloring. It is also slightly smaller than luteocincta and 

 has more coarsely punctate elytra. The shape of the aedeagus is 

 similar to that of luteocincta. No vittate form has been seen. 



18. TRIRHABDA SERICOTRACHYLA, new species 



Plate 2, Figure 18 



Description. — Of similar shape and coloring to T. luteocincta., but 

 smaller and with pubescent, closely and coarsely punctate prothorax, 

 and paler ventral surface. Head densely and rugosely but not 



