60 



Phthorophloeus liminaris Harris; Rept. Ins. Inj. Veg., p. 78, 1852 {Tomicus). 



Length, 2-3 mm.; rather stout; the elytra rather feebly rugose; the 

 antennal club with the segments very strongly produced laterally; the 

 female with the front plano-convex, the epistomal region impressed and 

 bounded behind by an arcuate transverse carina; the male with the front 

 more deeply concave in front of the carina and subtriangularly concave 

 behind it. 



Host trees. — Peach, Wild Cherry. 



Distribution. — Eastern United States, southern Ontario, southern 

 Quebec (Montreal region, in wild cherry). 



An injurious species in peach orchards. 



The Genus Dendroctonus Erichson, 



Erichson; Weig. Arch. f. Naturgesch, II, p. 45-65, 1836; Eichh., Europ. 

 Borkenkafer, 125, 1881; Reitter, Bestimmungstabelle der Bork., 47; Hopkins^ 

 The Genus Dendroctonus, U. S. Bur. Ent., Tech. Series, 17, part 1; 1909. 



Generic Characters. — The body rather stout, cylindric; large for the family, 

 from 3 to 9 mm. in length; the head broad, prominent, visible from above; 

 the beak very short, with a well developed epistomal process; the eyes trans- 

 verse, short or long oval, entire; the antennal funicle 5-segmented, with the 

 club broad, thickened basally and flattened distally; the pronotum approximately 

 one-half as long, and nearly or quite as wide as the elytra, punctured throughout, 

 not closely asperate in front; the anterior coxae approximate; the tarsi with 

 the third segment dilated and bilobed; the elytra crenulate at the base, with 

 the striae slightly or distinctly impressed, with the strial punctures small to 

 moderately coarse; the declivity abrupt. 



Key to the Canadian Species. 



A The pronotum only slightly narrowed in front, feebly constricted in the 



male, and as wide as the elytra; the elytra without long hairs, clothed 



with abundant, short, nearly erect pubescence, with a few slightly longer 



hairs intermixed; with a frontal tubercle on each side a distinct frontal 



groove in the male, less evident in the female. British Columbia, 



in Yellow Pine (PI. 12, fig. 5). brevicomis Lee. Page 62. 



AA The pronotum strongly constricted in front, and usually slightly but 



distinctly narrower than the elytra; the elytra normally always with 



long erect hairs extending nearly to the base (frequently abraded), 



without frontal tubercles and groove in either sex. 



B The epistomal process narrow, with its sides nearly parallel, and 



extending to or beyond the anterior margin of the epistoma; the 



striae deeply impressed on the declivity. 



PLATE 13. 

 IPID BEETLES— All Greatly Enlarged. (Original.) 



Fig. 1, Ips emarginatus Lee, declivity of the male. 

 Fig. 2, Ips emarginatus Lee, declivity of the fetnale. 

 Fig. 3, Orthotomicus caelatus Eichh. 

 Fig. 4, Ips plastographus Lee. 

 Fig. 5, Ips emarginatus Lee. 



