48 
INSECTA SAUNDERSIANA. 
on the disc longitudinally, being straightly horizontal from the base to 
four-fifths of their length, then very slightly declining to the callosity 
(hardly 35°), the declivity being evidently less than in any other species of 
the genus: this is one of the most important of its distinctions from the 
allied Pt. Columbianus , tricostifrons and nebulosus. The ante-apical cal¬ 
losity is broad at the base, conic, acute, extended horizontally beyond in 
large males, or at least to the perpendicular level of the apex, which is 
perpendicularly, subemarginately and very shortly cut under that callosity: 
this is best observed when the insect is seen from the side. The basal ex¬ 
tension of the callosities, conically porrected behind, gives to the elytra the 
appearance of being emarginate between them, when seen from above. 
Body beneath the flattest and least thick of the genus: obsolete ma¬ 
cular denudations are often observable at the base of the three posterior 
segments of the abdomen, which is generally widely denuded along its 
middle. 
Legs : — thighs very short proportionally to those of the species in the 
second group: intermediate not attaining to the base of the posterior; the 
latter reaching only the third part of the third abdominal segment. 
Ptychoderes nebulosus, Olivier. 
Modice elongatus , supra paullo deplanatus , postice sat angustatus ( prceser - 
tim in $), nigro-piceus, tomento infra albido-subjlavescente , dorso 
thoracis elylrorumque in vitta lata communi utrinque irregularis 
plus minusve determinata dilute fulvo-ferrugineo , lateribus infuscato 
tectus ; maculis punctisque ordinariis disci obscure brunneo-ferrugi- 
neis ; rostro modice elongato; capite pone oculos convexos paullo ex- 
tenso ; thorace latiusculo , latitudine paullo longiore , lateribus modice 
rotundato , supra late modiceque deplanato, carina postica utrinque 
dorsi parum arcuata , medio modice interrupta; scutello transversim 
breviter ovato ; elytris basi . truncato-emarginatis , thorace evidenter 
latioribus , humeris non obliquis , obtuse rotundatis , lateribus versus 
apicem modice angustatis , supra late , sed parum deplanatis , longitror- 
sum haud rectim horizontalibus , postice ante callum sat oblique de- 
clivibus , callo ante-apicali basi lato , breviter conico , libellam perpen- 
dicularem apicis suboblique perpendicular is in $ majoribus certe , in 
$ mediocribus minoribusque et $ non attingente. 
