INSECTS COLEOPTERA. 
65 
but of the pair at the middle, the outer one is larger, near the margin, and placed in advance 
of the inner one. 
L. crassijoes, elongata^ nigfa-j capite thoraceipie longius flavo-pilosis, hoc latitudine longiore, 
convexo, antrorsum, parum angustato, utrinque constricto, lateribus medio valde rotundatis ; 
elytris fortius punctatis, breviter pubescentibus, intra humeros longius impressis, luteis mar- 
gine tenui, macula subhumerali altera ad medium trienteque postica nigris, macula flava 
rotundata ante apicem signatis, postice subangustatis ad apicem oblique truncatis ; pedibus 
crassiusculis testaceis, antennis validis nigris. Long. '44. 
Steilacoom, Mr. Gibbs. The black spots of the elytra are all connected by a narrow black 
margin. The elytra are shaped as in L. octonotata Say, but the thorax is deeply constricted 
at each end ; this species, with the next, and Franhenliaeuseri and macilenta, form a group not 
represented in the Atlantic States, somewhat approaching Centrodera Lec. in form. 
L. fuscicollis, elongata testacea, capite thoraceque nigro-fuscis^ breviter pubescentibus, 
densissime punctatis, hoc latitudine longiore, antrorsum angustato, utrinque profunde con- 
stricto, lateribus medio obtuse tuberculatis, subtiliter canaliculato, elytris fortius punctatis, 
glabris, testaceis a humeros subangustatis, intra humeros impressis, ad apicem vix truncatis ; 
antennis elongatis fuscis. Long. '48. 
One specimen, San Francisco ; Mr. Child. 
Plectrura Mann. 
P. producta, nigro-picea, parce griseo-bupescens, guttulis flavo-pubescentibus parce adspersa, 
confertim rugose punctata^ thorace callo dorsali parvo, elytris callis nitidis seriebus quinque 
digestis, ad apicem non crenulatis, singulatim longe acuminatis. Long. "o. Tab. II, fig. 15. 
Lec. Proc. Acad. Nat. Sc. 7, 19. 
One specimen, collected by Dr. Cooper at Fort Vancouver. Differs from the description of 
P. spinicauda by the tips of the elytra being not crenulated^ as well as by the different arrange- 
ment of the tubercles of the elytra. They form five series, of which only the outer one is entire ; 
the others contain only three or four tubercles ; the sutural one is indistinct, the second ends 
just behind the middle, the third and fourth commence about one-third from the base, and end 
at one-fifth from the apex ; the scutellum and a little thoracic line anterior to it are densely 
clothed with yellow hair. 
Tetraopes Dalman. 
T. oregonensis, niger, capite thorace elytrisque coccineis (pallide pubescens?) thorace punctis 
4 nigris, disco subito elevate, antice posticeque valde constricto, lateribus subito valde dilatatis, 
parcius punctato, elytris parce punctatis, puncto humerali duobus ante medium, altero utrinque 
pone medium, scutelloque nigris ; pedibus antennarumque articulo primo coccineis, tarsis, 
genubus, tibiisque posticis nigris. Long. -55. 
Lec. Proc. Acad. Nat. Sc. 7, 19. 
Wenass river to Fort Colville; Dr. Cooper. This species has the form of T. femoratus Lec, 
but the thorax is still more dilated on the sides. From T. hasalis, in which the basal joint of 
the antennae is also red, it is easily distinguished by the sudden elevation of the middle of the 
thorax. The pubescence has been removed by the alcohol in which the specimens were pre- 
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