50 
INSECT A SAUNDERSIANA. 
Thorax as much broadened as in the last-mentioned species, but more 
widely and shallowly depressed, exactly as in the two others, differing from 
these only by being proportionally shorter. Elytra less deeply emarginate 
at the base than in Pt. elongatus , and not subrotundate at the middle of 
each, but subtruncate from the scutellum to the angles of the thorax, 
thence hardly deviating from that line to the shoulders, which are obtusely 
rounded; sides in the large males more narrowed towards the apex than 
those of the largest size in Pt. Columbianus and tricostifrons , but some¬ 
what less than in Pt. elongatus , though perhaps more so if we consider 
that they are proportionally much shorter, being only twice as long as at 
their median breadth. Their depression is less than in Pt. Columbianus , 
but their straightness, seen from the side or in profile, is nearly the same, 
with this difference, that they are in both sexes shorter, but their posterior 
declivity is more oblique. From their shortness, their lateral thickness, as 
well as that of the body beneath, is more evident, especially if we calculate 
the proportion between the perpendicular height of the insect and their 
length; they are nevertheless, as well as the body, not so thick as in 
Pt. tricostifrons. 
I have seen a number of specimens of this species. 
Ptychoderes Columbianus, Jekel . 
Valde elongatus , mediocriter deplanatus , niger, tomenlo infra albido 
grisescente , dorso thoracis elytwrumque in vitta lata communi 
irregularis determinata albido-subrosescente, la teribus brunneo tecto ; 
maculis punctisque ordinal Us disci brunneis; rostro longiore, capite 
modice elongato , pone oculos sat extenso , convexiusculo; ihorace 
paullo elongato , parum angusto , lateribus modice rotundatis, carina 
postica medio anguste interrupta , disco valde impresso; scutello 
parum transverso, ovato-subquadrato; elytris elongato-subparallelis, 
basi singulatim subrectis , margine latiusculo , piano , humeris paullo 
obliquis, rotundatis , parum callosis , lateribus versus apicem paululum 
angustatis , supra parum deplanatiss longitrorsum vix rectirn horizon- 
talibus ,. posterius ante callum mediocriter declivibus , callo anie- 
apicali basi lato, breviter conico , libellam perpendicularem apicis 
deflexo-perpendicularis saltern attingente. 
