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 (PL 9, 

 fig. 34). IPHXE. 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 (PL 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, 1 cedar, and yellow cedar. 



THE FAMILY IPID^E. 

 SUBFAMILIES OF THE IPID^J. 



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

 angle (PL 9, figs. 16, 17). ECCOPTOGASTERIISLE. Page 39. 



AA The anterior tibise not strongly produced at the outer apical angle (PL 9, 

 figs. 23, 24). 



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

 roughened in front (PL 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 (PL 13, 

 fig. 4). 



C The anterior tibise 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, (PL 10, fig. 19). 



MICRACIN^;. Page 44. 



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

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



IPINM. Page 44. 



1 One doubtful record from Western White Pine. 



