38 



The Superfamily Ipoidea (Scolytoidea). 



This subfamily is distinguished from the rest of the Rhynchophora, and 

 from all other Coleoptera, by the following characters : — 



The submentum not strongly produced behind; the beak very short or 

 indistinct; the antennae geniculate and clavate; the tarsi five-segmented; the 

 maxillary palpi rigid; the tibiae usually serrate. 



families in the ipoidea. 



Tarsi with segment 1 as long as the others united (PI. 21, fig. 4). 



PLATYPODID.^. Page 38. 



Tarsi with segment 1 much shorter than the others united (PI. 9, 

 fig. 34). IPID^. Page 38. 



The family Platypodidce is represented in our area by one genus, Platypus, 

 and one species, wilsoni Sw. 



Platypus wilsoni Sw.; Can. Ent., 48: 97, 1916. 



Length, 5 • 5 mm. ; width, 1 • 3 mm. ; the male elytra are individually 

 produced at the apex (PI. 21, fig. 3). 



This is the most destructive Ambrosia beetle of the Pacific coast of 

 British Columbia; its black tunnels penetrate the wood often for more than 

 a foot. It attacks unhealthy and dying trees and felled logs of British 

 Columbia Coast conifers except pine,^ cedar, and yellow cedar. 



The Family Ipid^. 



subfamilies of the IPIDjE. 



A The anterior tibiae produced into a prominent process at the outer apical 

 angle (PI. 9, figs. 16, 17). ECCOPTOGASTERIN^. Page 39. 



AA The anterior tibiae not strongly produced at the outer apical angle (PI. 9, 

 figs. 23, 24). 



B The head visible from above; the pronotum rarely more strongly 

 roughened in front (PI. 12, figs. 1, 2). HYLESININ^. Page 39. 



BB The head subglobose, concealed from above by the pronotum; the 

 pronotum usually distinctly more strongly roughened in front (PI. 13, 

 fig. 4). 



C The anterior tibiae with the sides nearly parallel, not widened 

 distally; the antennal funicle usually 6-segmented; the first two 

 visible ventral segments of the abdomen subequal and each as 

 long as the last three united, (PI. 10, fig. 19). 



MICRACIN.^. Page 44. 



CC The anterior tibiae widened distally and serrate on the outer margin 

 (PI. 13, fig. 3); the antennal funicle with less than six segments. 



IPIN^. Page 44. 



1 One doubtful record from Western White Pine. 



