066 



FAMILY IV. SCOLYTID^. 



IV. HYLURGOPS Lec., 1876. (Gr., "wood? + "destroyer.") 



Treated as a subgenus of Hylastcs by Hagedorn (1010) but 

 retained as distinct by Swaine and by Reitter, the differences 

 being as given in key, and in fact used by Elrichson (1836) in 

 separating the species included. As pointed out by LeConte, 

 they are quite different in form from true Hylastcs, and resemble 

 Den drocto nits, the pro thorax being more narrowed forwards and 

 more finely and densely punctured, while the bases of elytra are 

 separately rounded. (Fig. 137, O.) 



1076 (9199). HYLURGOPS PINIFEX Fitch, Trans. N. Y. Agr. Soc., 1851, 43. 

 Stout, cylindrical, narrowed in front. Deep chestnut red or black, 



tinged with chestnut, with a thin, fine, short beard on hind part of elytra; 

 under surface black. Beak carinate, front transversely impressed; an- 

 tennas with 7-jointed funicle and 4-jointed club, the first joint of which is 

 as long as the others united. Head convex, visible from above. Thorax 

 broader than long, narrowed in front, slightly tubulate, with fine dorsal 

 line, finely and densely punctured. Basal margin of elytra subacute and 

 subserrate, separately rounded at base, apex slightly broader than base, 

 deeply striate with quadrate punctures; intervals of stria? with series of 

 small tubercles and short yellow hairs in posterior half. Prosternal ridges 

 acute, mesosternum protuberant, first and fifth ventral segments dis- 

 tinctly longer than the others. Front coxa? contiguous; legs dark chestnut, 

 tibia? with fine denticulations along outer margin, third joint of tarsi di- 

 lated and bilobed. Length 4.5 5 mm. 



Laporte Co., Tnd., scarce ; August 26. Described from New 

 York, the type taken from pine lumber in mill yards early in 

 May ; mining under bark of spruce stumps in November in Maine. 

 (Packard.) Lake Superior, Canada. Ohio, New Jersey, attacking 

 pine, mining, in green bark or dying trees. Treated by most 

 American authors as a synonym of glabratus but retained as 

 distinct by Swaine. 



1077 (9199). HYLUBGOPS GLABBATUS Zett., 1828, 343. 



Male wth slightly deeper transverse impressions 

 in front and with a longer longitudinal elevated line 

 above base of mandibles. Female with frontal trans- 

 verse line present, but shorter in some individuals 

 and obsolete in others. (Fig. 155.) 



This is a European insect, very similar to 

 the preceding and its citation in our lists per- 

 haps results from applying the European 

 name to our insect. It occurs throughout 

 Europe under pine bark, eating long tunnels 

 in the bast, the closely placed larval tunnels 



Fig. 155. X 3. 

 (After Felt.) 



