18 MISC. PUBLICATION 6 98, U. S. DEPT. OF AGRICULTURE 



black with a few reddish-yellow spots; body beneath greenish or 

 purplish black, the posterior margin of abdominal sternites yellowish r 

 and palpi and tarsi sometimes reddish brown. 



Head slightly narrower than pronotum, moderately flattened, 

 coarsely, densely, uniformly punctate, densely clothed with long and 

 short, fine, erect hairs. 



Pronotum quadrate, widest along apical half or at middle, mod- 

 erately convex ; sides broadly, arcuately rounded or parallel anteriorly, 

 more strongly converging posteriorly ; surface shining, coarsely, uni- 

 formly, rather sparsely punctate, rather densely clothed with long 

 and short, fine, erect hairs. 



Elytra slightly wider than pronotum, arcuately declivous near 

 apices; sides parallel or slightly expanded posteriorly, separately, 

 broadly rounded at apex; surface densely, finely, rugosely punctate, 

 rather densely clothed with rather short, erect, whitish hairs. 



Body beneath finely, densely, rugosely punctate, densely clothed 

 with long, semierect, whitish hairs; last visible aclbominal sternite 

 broadly, deeply, arcuately emarginate at apex ; second and third seg- 

 ments of anterior tarsi slightly expanded, and densely pubescent 

 beneath. 



Female. — Differs from the male in having the last visible abdominal 

 sternite broadly rounded at the apex, the second and third segments 

 of anterior tarsi not expanded, or conspicuously pubescent beneath, 

 and usually with all the abdominal sternites uniformly reddish yellow. 



Length 4.6-9 mm., width 1.2-2.5 mm. 



Type locality. — Of quadrisignata, near San Francisco, Calif. ; type 

 in the Ulke Collection in the Carnegie Museum, at Pittsburgh, Pa. Of 

 sexguttata, Mexico ; type in the collection of Bene Oberthur. 



Distribution. — From material examined: 



California: Los Angeles County (D. W. Coquillett ) . Los Gatos (Hubbard and 

 Schwarz). Mendocino County, May 1, 1919 (E. R. Leach). Oakland, March 

 21, 1931 (E. C. Zimmerman). Blair's Ranch, Redwood Creek, Humboldt 

 County, June 19, 1903 (H. S. Barber). 



Oregon: Hood River, May 19 (Hubbard and Schwarz). Corvallis, May 7, 1931. 



Washington: Moxee, April 29, 1943 (J. C. Dodge). Yakima, April 20-24, 1943 

 (E. J. Newcomer). 



It has been recorded by Horn (1878) from Mariposa County, by 

 Blaisdell (1892) from San Diego County, and by Lesne (1896, 1913) 

 from Sierra Nevada and Napa, Calif. 



Host. — Grape canes. E. J. Newcomer reported that during the 

 early part of 1943 this species seriously damaged 75 percent of the 

 2-year-old grapes in various vineyards in Washington, killing back 

 almost to the ground the canes trained the previous year to be used 

 as the main leaders. 



This species was described by Horn (1868) from a specimen col- 

 lected near San Francisco, Calif. Horn (1878) transferred the species 

 to Psoa and described a number of varieties based principally upon 

 the elytral markings without giving names to these varieties. In 1886 

 he figured the varieties. 



Lesne (1906) described sexguttata from a single female in the 

 Rene Oberthur Collection, originally labeled Malasia, but this locality 

 label had been changed to Mexico. It seems that the locality is un- 

 certain, and since no Psoa have been recorded from Mexico this speci- 

 men may have been collected in California. This form has the elytra 



