646 FAMILY IV. Sf'OLYTIDJE. 



1042 (9093). XYLOTERUS LINEATTTS Oliv., 1795, 18. 



Male with head concave and thorax finely, transversely asperate be- 

 fore the middle; female, head convex, thorax much more roughly asperate. 

 Varies greatly in color, the black elytra! vittae sometimes occupying nearly 

 the entire surface, sometimes almost wanting; front part of prothorax, 

 suture and margin of elytra usually black; sometimes only a short pale 

 stripe is seen on each elytron. Length 3.5 mm. 



North Mt., Pa., June 11. entering hemlock. (Wenzel.) Can- 

 ada, Eastern, Northern and Western United States, New Mexico. 

 Common in coniferous trees from Alaska to Maine, extending 

 southward in mountainous regions, and equally common in 

 Europe. Food plants, Pinus, Pi era, Abies, Tsuga, Juniperus, 

 Lari.r, Bctuhi, black spruce and hemlock. Enters green sapwood 

 of fogs, stumps and dying trees, causing great damage to saw 

 logs, producing pin-holes and bluing, and hastening decay. T. 

 birittatus Kirby is a synonym. 



1043 (9094). XYLOTERUS SCABRICOLLIS Lee., 1868, 158. 



Uniform reddish-brown, antennae and feet paler. Head deeply concave, 

 as usual, but thorax of male as rough in front as in female of Mvittatus, 

 and covered behind with anastomosing curved lines, leaving between them 

 flattened granules. Elytra shining and punctures of rows larger and 

 more strongly impressed. Length, 3.5 mm. 



Grenlock, N. J., April 8, entering white pine. (Wenzel.) 

 Quebec, Washington, D. C., West Virginia, New York, New Mex- 

 ico. Food plants, Pinus, Haiuamelis and Tsuga. Enters green 

 sap-wood of dying pine trees; adults in May. (Hopkins.} 



Tribe IV. MICRACINI. 



Pronotum with anterior area commonly rugose ; head con- 

 cealed from above; anterior tarsi with joint 3 simple; anterior 

 tibia? not distinctly broader toward apex or not serrate on outer 

 margin; antennal club compressed; elytra with scales. (Fig. 

 139, D.) 



KEY TO GENERA OF MICRACINI. 



o. Thorax margined at side. I. MICRACIS. 



aa. Thorax not margined at side. II. THYSANOES. 



I. MICRACIS Lee., 1868. (Gr., "smalF'+Cis.) 



Elongate cylindrical species, in which the declivity of elytra 

 is convex and suture prolonged into a short acute point; thorax 

 granulate, the granules becoming larger and acute in front of 

 middle. Club of antennae peculiar, having an elongated basal 

 smooth spot extending for more than lialf its length, parallel to 



