—198— 



in the classification to separate Xylotrechus fioni C/ylus- Dr. Leconte iri 

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



SYNOPSIS OF CLYTUS. 



Front more elongate flat ; 

 Kly tra black with yellow bands planifrons 



Front less elongate, depressed at middle; 

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



marginicollis. 

 l-'.lytra black with sutural and partial transverse bands lanifer. 



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



Length ^l to 13 mm. =30-52 ins. Hab. Cal., Nev. 



This species shows no variation in coloring except in the enclosed 

 line whicli usually transverse is sometimes oblique and the specimen 

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

 ed bv 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; vespoiJes Hald. Trans. Am. Phil. X, p. 40; Dej. Cat. 3 Ed. p. 356. 



Length 8 to 10 mm. =1.32 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. Aiiz. 



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 Chev. 



By the omission o{ 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 car nia reduced to an elongate space, scarcely divided; surface shining 



nitidus. 

 Frontal cai'ina a narrower eloni^ate space, divided or impressed longitudinally; 



Thorax with four pubescent spots, elytral pubescence white, inconspicuous 



4-maculatus 

 Thorax marked with lines, elytral pubescence yellow ;the lines connected at suturi. 



convergens. 

 Frontal carina V or V shaped; ^ 



Elytra at apex obliquely truncate, the outer angle spiniform; 



Sides of thorax regularly arcuate, sagittatus. 



Sides of thorax suddenly obliquely narrowed at basal third nauticus. 



Elytra at apex obliquely truncate rarely {cdonus) subacute externally; 



