NORTH AMERICAN BOSTRICHIDAE 111 



Head moderately convex, sparsely, finely punctate on front and 

 clypeus, with fine, longitudinal, parallel costae on occiput, rather 

 densely clothed on front with very long, erect, brownish hairs, which 

 are short and inconspicuous at middle behind clypeus ; clypeal suture 

 distinct at middle, obsolete at sides. 



Pronotum slightly wider than long, widest at middle ; sides broadly 

 rounded or parallel posteriorly, arcuately converging anteriorly, 

 with a small, broad tooth at anterior angles ; posterior angles broadly 

 rounded; surface rather densely clothed along sides and anterior 

 margin with long, erect, brownish-yellow hairs, very sparsely, 

 finely punctate at sides on basal half and at middle along anterior mar- 

 gin, obsoletely, imbricate-punctate or granulose at middle on basal half, 

 densely, irregularly dentate on apical half, the teeth broad, semierect, 

 variable in size, and rasplike. 



Elytra at base subequal in width to pronotum at middle; sides 

 nearly parallel, conjointly broadly rounded at apices; surface sparsely 

 clothed with very short, recumbent, inconspicuous, yellowish hairs, 

 coarsely, densely, deeply punctate, except along sutural margins on 

 apical declivity, where the surface is impunctate and smooth; apical 

 declivity with sutural striae deeply depressed on anterior part, the 

 sutural margins slightty, narrowly elevated, with two short, contig- 

 uous teeth, one on each margin near top of declivity, lateral margins 

 thickened and elevated; each elytron with two smooth, obtusely 

 rounded costae at base. 



Abdomen beneath densety, finely punctate, sparsely clothed with 

 short, recumbent, yellowish hairs ; last visible sternite rounded at apex 

 with the lateral grooves distinct. 



Female. — Resembles the male very closely, but usually has the last 

 visible abdominal sternite slightly emarginate at the apex and the lat- 

 eral pieces obsolete. 



Length 5-7.5 mm., width 1.75-2.75 mm. 



Type locality. — Sacramento, Calif. ; type in the LeConte Collection 

 in the Museum of Comparative Zoology, Cambridge, Mass. 



Distribution. — From material examined : 



California : Los Gatos, Santa Cruz Mountains, Fresno, Monterey, Yosemite 

 Valley, King's River, Inyo Mountains, Kaweah, Sylvania, Lake Taboo, 

 Confidence, Hillsborough, Argus Mountains, Hollister, Lamoine, Los Angeles, 

 Mokelumne, Dunsmuir, Nordhoff, Falo Alto, Shingle Springs, Placerville, 

 Salinas, San Jose, Vade, Watsonville, Sacramento, Tuolumne, Pomona, Orange, 

 Cisco, Fort Tejon, Sonoma, Afton Canyon, Merced Falls, Humboldt County, and 

 San Nicolas Island. 



Oregon: Hood River, Corvallis, Ashland, and Benton County. 



Washington : Yakima. 



Hosts. — Adults have been reared from sweet cherry (Prunus avian) 

 L.), coast live oak (Quercus agrifolid Nee), California black oak 

 ( Quercus helloggii Newberry) , California blue oak (Quercus douglasii 

 Hooker and Arnott), valley white oak (Quercus lobata Nee), canyon 

 live oak (Quercus chrysolepis Liebmann), tan oak (Quercus <hn- 

 siflora (Hooker and Arnott) Render) , English elm ( Ulmus campestris 

 L.) , bigleaf maple (Acer macrophyllum Pursh.) , Oregon myrtle (Fm- 

 bellularia California (Hooker and Arnott) Nuttall.), gum (Eucalyp- 

 tus sp.) and wattle (Acacia sp.). Coquillett (1892) recorded it from 

 orange and rose stalks. E. J. Newcomer reared it from grape canes 

 at Yakima, Wash. 



