KEY TO THE LONG=HORNS. 



yellow pubescence covering the greater part of the head 

 and forming two short oblique bands on each side of the 

 pronotum and five on each elytron, the first two of which 

 are decidedly oblique and the last (apical) one broad and 

 including a dark spot; length, about I in. Larvae bore 



in maples and are often injurious. Northern 



Plagionotus speciosus. 

 Antennae thread-like 6. 



6. Brownish-black, densely clothed with velvety pubes- 

 cence; each elytron usually with a rounded, yellow spot at 

 the base, a small one near it and the margin, a larger one 

 before the middle, and two narrow, transverse, sinuous 

 bands on apical half; antennae one-half the length of the 

 body, which is .8 in., or more Calloides nobilis. 



Not more than .75 in. long; black; head and pronotum 

 covered with grayish pubescence, the latter with a large, 

 black spot in the center and a small, round one on each 

 side; elytra marked with obscure, zigzag bands of grayish 

 pubescence. Breeds in chestnut, oak, and butternut. 



Arhopalus fulminans. 



7. Elytra flat on basal third ; not less than .3 in. long. ... 8. 

 Elytra swollen on basal third; small, ant-like species, 



not over .4 in. long 18. 



8. Front of head with one or more ridges 9. 



Front of head without ridges 13. 



9. Ridges on the front 'of the head reduced to an elongate 

 space; length usually not much more, if any, than 



5 m 10. 



Ridges on face V- or Y-shaped; length usually not 

 much less, if any, than .5 in n. 



10. Ridge on face divided or impressed longitudinally; 

 black; thorax with four spots of yellowish pubescence; 

 elytra with the sutural line and three oblique extensions 

 from it dull yellow. Usually on black alder 



i Xylotrechus quadrimaculatus. 



Ridge on face scarcely divided; shining black beetle, 

 with yellow margins Xylotrechus mtidus. 



11. A spine on the outer angle of the obliquely-cut apex 

 of each elytron ; brownish, with white pubescence. Usually 

 on dead pine Xylotrechus sagittatus. 



347 



