INSECTS COLEOPTERA. 45 



DICERCA Esch. 



D. pectorosa, supra obscure fusco-aenea, capite inaequali grosse punctate, thorace latitudine 

 plus duplo breviore, valde canaliculate, fere bicostato, (costis laevibus), ad latera inaequali, 

 grosse confluenter punctate, lateribus valde rotundato-dilatatis, postice breviter sinuatis, angulis 

 posticis acutis, elytris thorace angustioribus lateribus parallelis, postice prolongatis integris, 

 foveatim striato-punctatis, rugosis, interstitiis dense punctatis, spatiis parvis irregularibus 

 nitidis parum elevatis, praecipue versus scutellum notatis. Long. 64. 



Oregon, Dr. Suckley, Somewhat similar to D. tenebrosa, but the thorax is much more 

 dilated, and the smooth spaces of the elytra are not distinct, and are irregularly connected. 

 The terminal segment of the abdomen is truncate, strongly bicostate, with four deep subapical 

 foveae. The under surface is dark brassy, with large rugous punctures of a brighter color. 



D. crassicollis, supra obscure cinereo-aenea, capite inaequali grosse punctato thorace latitudine 

 plus duplo breviore, fere quadricostato, costis exterioribus interruptis, utrinque late excavato, 

 lateribus valde dilatatis, postice longius sinuatis, angulis posticis paulo acutis ; elytris thorace 

 haud latioribus, humeris rotundatis lateribus subparallelis, postice breviter caudatis et sub- 

 bidentatis, grosse indistincte striato-punctatis, interstitiis densissime punctatis, alternatim 

 plagis oblongis elevatis laevibus ornatis. Long. 66. 



Steilacoom, Dr Suckley. The elytra are sculptured exactly as in D. tenebrosa, but the rows 

 of punctures are less obvious ; the posterior prolongation is shorter, and slightly bidentate ; the 

 thorax is much more dilated on the sides, and more deeply excavated ; in one specimen a small 

 callus is seen in the middle of the dorsal channel. The terminal ventral segment of the male is 

 rounded, but in the female has two acute narrow incisures. 



POLYCESTA Esch. 



P. californica, nigro-aenea, elongata, capite grosse confluenter cribroso, haud excavato, 

 thorace brevissimo antrorsum angustato, lateribus obtuse angulatis, angulis posticis obtusis 

 haud rotundatis, inaequaliter cribrato, vage tricanaliculato, canalis externis antice abbreviatis, 

 ante scutellum linea brevi longitudinal! impresso ; elytris margine basali, costisque quatuor 

 elevatis, interstitiis confertim punctatis et biseriatim grosse punctatis lateribus antice late 

 rotundatis, dein parallelis, humeris obtusis. Long. 75. 



Sacramento, Mr. Wittick, one specimen. This species much resembles a larger one found in 

 Texas and a smaller one from Alabama ; but from each it is distinguished by the front not 

 being concave and by the more regularly and densely punctured spaces between the costae of the 

 elytra ; the series of punctures adjacent to the costae are smaller and more regular ; the three 

 inner costae are smooth, while the external one is punctured ; the tips of the elytra are broken, 

 some of the small teeth of the lateral serration yet remain. 



PEROTHOPS Esch. 



P. Witticki, piceus, undique fusco sericeus, confertissime punctulatus, vertice transversim 

 profunde excavato, thorace latitudine duplo breviore, canaliculate valde convexo, ad basin 

 declivi, antrorsum valde angustato, lateribus valde rotundatis, elytris striatis interstitiis paulo 

 convexis. Long. 82. Tab. I, fig. 18. 



