56 U. S. NATIONAL MUSEUM BULLETIN 216 



separated by a broad pale reddish to ochreous median annulus that 

 is sometimes interrupted by a fuscous line beneath (the annuli usu- 

 ally distinct but not sharply delimited) ; hind tarsus brownish to 

 fuscous, with bases of segments 1-3 dull yellowish; pattern of hind 

 tibia and tarsus sometimes faintly repeated in middle leg. 



Female: Front wing 3.5 to 8.0 mm. long; antenna with 20 to 24 

 segments; ocelli small, lateral ocellus with diameter 0.66 times dis- 

 tance from ocellus to eye; cheek about 0.33 breadth of mandible at 

 base; temple, as seen from above, with anterior 0.5 weakly 

 rounded and posterior 0.5 strongly rounded to occiput; thorax moder- 

 ately stout; propodeum unusually short, subhorizontal on about basal 

 0.4 and beyond rather abruptly and strongly declivous; dorsomedial 

 carinae of propodeum moderately to rather strongly elevated, sub- 

 parallel on subhorizontal portion of propodeum (at apex of which they 

 are sometimes united by a more or less distinct, transverse carina) 

 and often rather abruptly and strongly divergent beyond; sides and 

 dorsal region of basal 0.4 of propodeum with numerous, large, shallow 

 punctures, base of declivous portion more or less transversally, finely, 

 irregularly rugulose; hind femur 3.6 to 4.0 times as long as deep; 

 abdomen stout; tergite 1 usually distinctly broader than long, with 

 sides and apex of central area moderately to densely punctate; tergites 

 2-7, except on apices, with numerous, fairly evenly distributed 

 punctures that are most distinct on tergites 2 and 3 and progressively 

 shallower and less distinct on successive tergites; sheath as long as 

 abdomen ; ovipositor moderately compressed and with a distinct nodus. 



Black, occasionally with reddish marking on metapleurum and 

 abdomen. Flagellum as in male; maxillary palpus yellowish to 

 fuscous; labial palpus fuscous; tegula and hind angle of pronotum 

 yellowish; stigma blackish, usually with margins narrowly but rather 

 conspicuously pale yellowish; metapleurum sometimes (in specimens 

 having abdomen more or less red) with a reddish spot; legs varying 

 from entirely reddish to reddish with coxae and sometimes trochanters 

 more or less black and hind tibia occasionally somewhat fuscous sub- 

 basally and at apex; abdomen black, or with tergite 2 and to a lesser 

 extent tergite 3-5 or 3-6 with reddish markings. 



The female in this species varies geographically in color of legs and 

 abdomen. Specimens with the legs entirely red and the metapleurum 

 and abdomen conspicuously marked with reddish predominate in the 

 coastal region of the northeastern Atlantic states, and are also found, 

 but with less frequency, in the Gaspe region of Quebec and in Michigan. 

 In specimens from other regions the metapleurum and abdomen in- 

 variably lack reddish markings and at least the front coxa is more or 

 less black. Often the black markings on the legs are not confined to 

 the front coxa but may invade the middle coxa (beginning at the base) 



