INSECTS — COLEOPTERA. 
45 
DicERCA Esch. 
D. pectorosa, supra obscure fusco-aenea^ capite inaequali grosse punctato, thorace latitudine 
plus duplo breviore, valde canaliculate, fere bicostato, (costis laevibus), ad latera inaequali, 
grosse confluenter punctato, lateribus valde rotundato-dilatatis, postice breviter sinuatis, angulis 
posticis acutis, elytris tborace 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. tenehrosa, but tbe 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 
baud 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. tenehrosa, 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, baud excavato, 
thorace brevissimo antrorsum angustato, lateribus obtuse angulatis, angulis posticis obtusis 
baud rotundatis, inaequaliter cribrato,' vage tricanaliculato, canalis externis antice abbreviatis, 
ante scutellum linea brevi longitudinali 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. Witticld, piceus, undique fusco sericeus, confertissime punctulatus, vertice transversim 
profunde excavato, thorace latitudine duplo breviore, canaliculato valde convexo, ad basin 
declivi, antrorsum valde angustato, lateribus valde rotundatis, elytris striatis interstitiis paulo 
convexis. Long. •82. Tab. I, fig. 18. 
