CfQ BULLETIN 14 5, UNITED STATES NATIONAL MUSEUM 



son) : Canyon live oak (Q. chrysolepis Liebmann) ; Engelmann or 

 mesa oak {Q. engelmannn Greene) ; California black oak (Q. kel- 

 loggii Newberry, syn. oaUfornica Torre} 7 ) ; and Tan oak (Q. densi- 

 fiora (Hooker and Arnott) Render.). 



This species causes considerable injury to oak trees used for orna- 

 mental purposes by girdling the twigs and giving the trees a ragged 

 and unsightly appearance, and in the economic literature has been 

 recorded as the " Pacific oak twig-girdler." So far it has been re- 

 corded only from California, and ranges from a few feet above sea 

 level to an altitude of 6,000 feet. Childs (1914) and Essig (1915) 

 had this species confused with polittf* Say. Burke (1920) gives a 

 very good account of this insect and its work. All of the California 

 locality records, and the California live and black oaks host records 

 given under arcuatus Say by Chamberlin (192G). should apply to 

 this species, as angelicas Horn replaces arcuatus Say on the Pacific 

 coast. 



16. AGRILUS MASCULINUS Horn 



Figure 11 



Agrttus masculinus Horn. Trans. Ainer. Ent. Soc, vol. 18. 1891, pp. 295- 

 296. — Stromberg, Canad. Ent., vol. 26, 1894, p. 36. — Chittenden, U. S. 

 Dept. Agric. Div. Ent., Bull. 22. new ser., 1900, p. 68.— Slosson, Ent. 

 News, vol. 13, 1902, p. 6. — Blatchley. Coleoptera of Indiana, 1910. 

 p. 799. — AVeiss. Ent. News, vol. 26. 1915, p. 101. — Johnson, Ent. News, 

 vol. 27, 1916, p. 117.— Chagnon, 9th Kept. Quebec Soc. Protection 

 Plants, suppl., pt. 3. 1917, p. 219.— Knull, Ent. News. vol. 31. 1920, 

 p. 10. — Frost and Weiss, Canad. Ent., vol. 52, 1920, p. 206. — Britton, 

 Conn. State Geol. and Nat. Hist. Survey. Bull. 31. 1920. p. 244.— 

 Frost. Canad. Ent.. vol. 52. 1920, p. 28— Knull. Canad. Ent., vol. 54, 

 1922, p. 84— Champlain and Knull, Ent. News, vol. 34, 1923. p. 274.— 

 Hatch, Mich. Acad. Sci. Arts and Letters, vol. 4. 1924. p. 571. — 

 Mundinger, N. Y. State College Forestry, Tech. Pub. 17. pt. 4. 1924, 

 p. 316.— Knull. Ohio State Univ. Stud'es, vol. 2. no. 2. 1925. p. 42, 

 pi. 1, fig. 22.— Chamberlin. Cat. Buprestidae. 1926. p. 70. 



Agrilus otiosus Chittenden, U. S. Dept. Agric. Div. Ent.. Bull. 22, new 

 ser.. 1900, pp. 65-66, 68 (part).— Frost and Weiss, Canad. Ent., vol. 

 52, 1920, pp. 205-206 (part). — Mutchler and Weiss, N. J. Dept. Agric, 

 Bur. Statistics and Inspection, Circ. 4S. 1922. p. 9 (part ).— Felt, 35th 

 Kept. N. Y. State Ent. for 1921 (1923). p. 90 (part) .—Chamberlin, 

 Cat. Buprestidae, 1926. pp. 74-75 (part). 



Male. — Form of otiosus, but slightly more robust, and moderately 

 shining; antennae and head bronzy green; pronotum bronzy green, 

 witli a more or less brownish tinge, elytra piceous, w T ith a strong 

 bronzy reflection; beneath dark bronzy green, and more shining than 

 above. 



Head with the front wide, nearly flat, narrower at base than apex, 

 the lateral margins feebly arcuately expanded from bottom to top, 

 and with a feeble, longitudinal, median depression, which is nar- 



