382 CALIFORNIA ACADEMY OF SCIENCES. 



eleven not differing notably in length, the second very 

 little shorter. Head oval, moderately closely but not 

 deeply punctate, surface sparsely pilose. Thorax one- 

 half longer than wide at base, broader at apex with the 

 usual broad constriction in front of and behind the mid- 

 dle, at base bituberose, surface nearly smooth with faint 

 traces of transverse wrinkles and sparsely scattered fine 

 punctures bearing erect hairs. Elytra not wider at base 

 than the thorax, body apterous, sides gradually divergent, 

 apices very obtuse, surface with strite of moderately 

 coarse not closely placed nor deeply impressed punctures 

 which become obsolete at the middle near the suture, but 

 extend two-thirds to apex near the sides, intervals with 

 very sparsely placed fine punctures bearing erect hairs, 

 color pale brown with a narrow yellow band with irregu- 

 lar edges extending slightly arcuately outward and back- 

 ward from the suture. Body beneath brownish. Meso- 

 sternum coarsely punctured. Abdomen indistinctly punc- 

 tured, a yellow spot at the side of each segment. Legs 

 brown, femora at base, tibia^ and tarsi paler. Length, 

 .46 inch ; 11.5 mm. 



j\Ialc. — Ventral segments three to five broadly emargi- 

 nate and successively more deeply, sixth ventral semi- 

 circularly emarginate. Last dorsal narrower than the 

 ventral, truncate at tip with an acute notch at middle. 



This species must be placed near ovipeunis and angus- 

 tata, the former of which it resembles in elytral marking 

 and sculpture. It differs from either in the comparatively 

 smooth thorax with distinct metallic surface lustre, a 

 character unknown in any North American species. 



Sierra el Chinche. 



Trichodes peninsularis n. sp. Plate viii, fig. 7. 

 Form slender, beneath bri";ht olive cjreen and shining- 

 above head and thorax violaceous, elytra blue-black with 



