500 



U. S. NATIONAL MUSEUM BULLETIN 216 



PART 3 



We have found the subspecies abundant about logs and standing 

 trunks of large dead conifers, especially trunks of Pinus lambertiana 

 and P. ponderosa jeffreyi. To attract the adults, such logs or trunks 

 should have been dead for several years and largely bare of bark. 

 The males come to them to explore about, beginning at or near the 

 bottom of a trunk and working upwards. Females are more wary 

 and harder to catch than males. When captured, both sexes give 

 off the same strong, musty odor as species of Trachysphyrus. 



This subspecies occurs in the Sierra Nevada, mostly in the Canadian 

 zone. 



3e. Echlhrus adillae tibialis, new subspecies 



Male: Black. A fulvous spot in lower lateral corner of face, 

 another on cheek, and another covering clypeus; palpi yellowish 

 fulvous; scape and pedicel yellowish fulvous, with a blackish stripe 

 on outer side; first 14 segments of flagellum fulvous, the rest black; 

 tegula, subtegular ridge, tibiae, and tarsi yellow; trochanters brownish 

 fulvous, the first trochanter of middle and hind legs infuscate basally ; 

 front femur fulvous with its apex yellowish; middle femur brownish 

 fulvous with its base and apex yellowish fulvous; hind femur brown 

 with its base and apex yellowish fulvous; wings with a light yello\\ish 

 brown tinge; abdomen black. 



Female: Black. Mandible ferruginous; labrum stramineous; palpi 

 brown; basal 3.5 segments of flagellum entirely brown or the brown 

 partly replaced by pale yellow; flagellum with a pale yellow band 

 extending from middle of fourth segment almost to apex of seventh; 

 tegula brown; subtegular ridge often yeUow; front and middle tro- 

 chanters and femora fulvous to dark brown, the femora pale fulvous 

 apically; tibiae yellow, the front tibia fulvous at base, apex, and 



Figures 285-287. — Localities: 285 (left), Echthrus adillae ruhidus; 286 (center), 

 E. a. tibialis; 287 (right), E. a. brunneus. 



