— iuS— 



in the classification to separate Xylotrechus from Chins- Dr. Leconte in 

 ascribing it to the first was guided by the flat front which is like that genus. 



SYNOPSIS OF CLYTUS. 



Front more elongate flat; 

 Elytra black with yellow hands planifrons 



Front less elongate, depressed at middle; 

 Elytra pale at base, otherwise black with yellow transverse hands. . . . 



marginicollis. 

 Elytra black with sutural and partial transverse hands lanifer. 



C. planifrons Lee. Trans. Am. Ent. Soc. V. 1875, p. 67. 



Length 7. 1 , to 13 mm. =30-52 ins. Hah. Cab, Nev. 



This species shows no variation in coloring except in the enclosed 

 line which usually transverse is sometimes oblique and the specimen 

 then very closelv resembles X. insignis from which it may be distinguish- 

 ed by the absence of the frontal carina, the greater length of the poster 

 ior femora, and by the absence of yellow hair on the elytra each side the 

 scutellum, 



C. marginicollis Lap and Gory. Mon. p. 41, t. 9. f. 50; Lee. J. A. P. ser. 2. 

 II. p. 26; vespoides Hald. Trans. Am. Phil. X, p. 40; Dej. Cat. 3 Ed. p. 356. 



Length 8 to 10 mm. =.32 to .40 ins. Hab. Mass. Ga. Pa. Nev. 



C. lanifer Lee. S. M. C. No. 264, 1873, p. 198. 



Length 9 to 14 mm. =.36 to .56 ins. Hab. Cal. Ariz. 



The abundance of yellow hair gives this species a distinctive woolly 

 appearance from which it derives its name. The three transverse yellow 

 bands are variable in length being usually mere spurs from the sutural 

 band. 



XYLOTRECHUS Ohm. 



By the omission of planifrons this becomes a perfectly defined ge- 

 nus, including all the Clytini with the front of the head carinate. The 

 species may be separated as follows: 



SYNOPSIS OF XYLOTRECHUS. 



Frontal carina reduced to an elongate space, scarcely divided; surface shining 



nitidus. 

 Frontal carina a narrower elongate space, divided or impressed longitudinally; 



Thorax with four pubescent spots, elytra! pubescence white, inconspicuous 



4-maculatus. 

 Thorax marked with lines, elytral pubescence yellow ;thc lines connected at suture. 



convergens. 

 Frontal carina V or Y shaped; 



Elytra at apex obliquely truncate, the outer angle spiniform; 



of thorax regularly arcuate, sagittatus. 



Sides of thorax suddenly obliquely narrowed at basal third nauticus. 



Elytra at apex obliquely truncate rarely (colonus) subacute externally; 



