28 U. S. NATIONAL MUSEUM BULLETIN 216 part s 



3a. Baryceros audax audax (Cresson), new combination 



Mesostenus audax Cresson, 1878, Canadian Ent., vol. 10, p. 207; 9. Type: 9, 



Georgia (Philadelphia). 

 Mesostenus exaptus Cresson, 1878, Canadian Ent., vol. 10, p. 208; 9 • Type: 9 , 



Massachusetts (Philadelphia). 



Male: Black. Head and thorax marked with white as in female of 

 B.fortis (fig. 330, c), except that face and clypeus are entirely white 

 and flagellum is entirely black; front and middle coxae and tro- 

 chanters white, the coxae blackish at extreme base and often with a 

 small external apical fuscous spot; front and middle legs beyond 

 trochanters fulvous, the last segment of front tarsus brownish and last 

 two or three segments of middle tarsus fuscous or infuscate; hind coxa 

 blackish, white basally and apically above, thus colored like hind 

 coxa of female of B. fortis; hind first trochanter white, fuscous above 

 on base and apex; hind second trochanter black, partly whitish at 

 base; hind femur fulvous, fuscous apically and basally above, the 

 amount of fuscous variable; hind tibia blackish, with a subbasal, 

 indistinctly bounded, fuscofulvous area of variable development; 

 hind tarsus white, the base of basitarsus sometimes infuscate, and 

 apical 0.1 to 0.4 of last segment fuscous; abdominal tergites each with 

 a wide apical white band, the first segment also with a whitish area of 

 variable extent that is continued forward under spiracle to petiole; 

 genitalia white. 



Female: Black. Head and body marked with whitish and fulvous 

 as in B. fortis (fig. 330, c), except that first abdominal segment lacks 

 the fuscous mark. Mesoscutum with a median pair of white stripes, 

 the curved white line on lower part of mesopleurum sometimes broken 

 into two spots; flagellum with a white band; palpi whitish; front and 

 middle coxae and trochanters fulvous with a variable amount of 

 whitish; hind coxa mostly fulvous, basally with a variable amount of 

 fuscous, and with a variable amount of whitish markings; hind tro- 

 chanters fulvous; legs beyond trochanters fulvous, the last segment 

 of all tarsi and area at articulation of hind femur with trochanter 

 fulvous; postpetiole fulvous, with a white apical band. 



Specimens (42 cf, 749): From Alabama (P3a-iton in Clay Co.); 

 Connecticut (Brook State Park at Wallingford) ; Kansas (Douglas 

 Co. at 900 ft.) ; Maryland (Baltimore, Cabin John, Plummers Island, 

 and Takoma Park); Massachusetts (Martha's Vineyard); Michigan 

 (Ann Arbor and Midland Co.) ; New Jersey (Lucaston) ; New York 

 (Farmingdale, McLean Bogs Reserve in Tompkins Co., top of Mount 

 Marcy, New Russia, Nyack, and Yaphank); North Carolina (valley 

 of Black Mts., Crabtree Meadows in Yancey Co. at 3,600 ft., Ham- 

 rick, Mount Mitchell, and Raleigh) ; Ohio (Columbus, Hocldng Co., 

 and Jackson Co.,); Pennsylvania (Carlisle Junction, Delaware Water 



