490 



U. S. NATIONAL MUSEUM BULLETIN 216 



PART 3 



Figures 275, 276. — Localities: 275 (left), Echthrus ahdominalis vancouverensis; 276 (right), 



E. a. abdofninalis. 



We have found this subspecies abundant on large trunks and logs 

 of Pinus, that have usually been dead for several years and are bare 

 of bark. Males fly to these and explore about, beginning at or near 

 the bottom and working upwards. Females are very wary and hard 

 to catch. 



This subspecies ranges from southern British Columbia and Alberta 

 to central California and Yellowstone Park, W^^o. 



lb. Echthrus abdominalis abdonainalis Cresson 



Echthrus abdominalis Cresson, 1868, Canadian Ent., vol. 1, p. 37; 9- Type: 



9, Ottawa, Ont. (Philadelphia). 

 Mesochorus Saint-Cyri Provancher, 1874, Naturaliste Canadien, vol. 6, p. 299; 



9. Lectotype: 9 , Quebec (Quebec). 



Male: Black. Broad stripe on side of face beginning at level of 

 antennal socket and extending downward (usually to cover cheek), 

 sometimes central part of clypeus, and sometimes subbasal area on 

 mandible, white; scape white or black in front; palpi, tegula, obscure 

 area on subtegular ridge, and legs, fulvous; wings with a faint brown- 

 ish tinge. 



Female: Black. Scape piceous to black; palpi, tegula, legs, and 

 usually the abdomen fulvous, the base of first abdominal segment 

 sometimes fuscous; cheek next to base of mandible usually with a 

 brown or stramineous area ; lower lateral part of face sometimes with 

 a poorly defined brownish area; mandible fulvous to piceous; flagel- 

 lum with a white band (complete) that covers about 6 segments; 

 wings with a light brownish tinge. 



Nearly all females have the abdomen fulvous, but five, as follows, 

 have it black: 9, Itasca Park, Minn., May 30, 1936, A. B. Gurney 



