406 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 117 



In the other 142 specimens from numerous localities which I 

 examined, only one specimen (North Bend, British Columbia) bears 

 the awl-shaped segment. One can, therefore, place no rehance on 

 the form of this segment. Evidently the Modoc County series 

 represents an isolated population; I have seen nothing approaching 

 this antennal modification in any other members of Platydema. 



Types.— Holotype male and allotype female, USNM 66049; Modco 

 County, Calif., 15 miles north of Alturas, June 16, 1954, R. O. Shuster. 

 Paratypes: same data as holotype placed in following collections — 2 

 each in BMNH, MCZ, CU, OSU, CAT; 90 in UCal. 



Specimens examined. — From the following localities, 264: 



United States: California (15 miles north of Alturas, Angora Lake, Auburn, 

 Boonville, Carmel, Carter Mountain, Chester, Davis, Facht, Fallen Leaf, Fish 

 Camp, Hat Creek, Idyllwild, Lassen National Park, Lone Pine, Los Angeles, 

 Mammoth, McCloud, Meadow Valley, Mokelumne Hill, Monterey, Nichols Mills, 

 Old Station, Placerville, Pohono Trail, Round Meadow Giant Forest, San Jacinto 

 Mts., Sierra National Forest, Soda Springs, Viola, Weed, Yosemite, Humboldt 

 Co., Madera Co., Mariposa Co., Tulare Co.). Idaho (Coeur d'Alene, Centerville, 

 Moscow, Riggins, Robinson Lake). Montana (Kalispell, Sula). Nevada (Reno, 

 Washoe Co.). Oregon (Blue Mts., Cliff Ridge, Dilley, Hilgard, Hood River, 

 The Dalles). Utah (Logan Canyon). Washington (Fort Lewis, Pullman. 

 Tenino) . 



Canada: British Columbia (North Bend). 



Platydema oregonense LeConte 



Plate 4 (Fig. 27) 

 Platydema oregonense LeConte, 1857, p. 51. — Horn, 1870, p. 383. 



Description. — Body broadly ovate, strongly convex, dark reddish 

 brown to almost black, moderately shining. Head deeply impressed 

 between eyes, coarsely but not densely punctured, antennae and 

 mouthparts reddish brown, terminal segment of maxillary palpus 

 elongate, narrowly triangular; eyes rather small, flattened dorsally, 

 separated ventrally by a distance subequal to 1.5-2.0 times the longer 

 axis of one eye. Pronotum trapezoidal, evenly convex from side to 

 side, sides almost straight, basal angles rectangular, apical angles 

 obtusely rounded, lateral marginal bead fine, narrowed basaUy and ap- 

 ically, slightly wider behind middle, surface finely and sparsely punc- 

 tured on disc, punctures becoming larger and more closely spaced 

 laterally. Elytral striae feebly impressed, finely punctured, outer- 

 most stria on each side conspicuously abbreviated at both ends, 

 punctures closely spaced medially, becoming increasingly farther 

 apart and disappearing altogether at a considerable but variable 

 distance from both base and apex; intervals subconvex, minutely 

 and sparsely punctate; lateral margins of elytra undulated, marginal 

 bead fine, feebly reflected. Prosternal process narrow anterior to 



