40G PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
black; front below antennae black (except orbits sometimes and rarely 
hyperclypeus) 23. 
Coxae yellow, or yellowish; front below antennae, narrow inner orbit 
above, an obtuse-angled band on mcso-cpisternum, and posterior 
mesal portion of pectus, yellow; apical portion of posterior femora and 
of posterior tibiae, and posterior tarsi, black 
pallicola (MacGillivray), p. 439. 
23. Legs with much black, or with more black than ferruginous (ferruginous 
sometimes light); four or more basal abdominal terga, and posterior 
femora, black tricolor (Norton), p. 441. 
Legs with comparatively little black (typically) ; abdomen with only first 
tergum black (second may be dusky); posterior femora black only 
in part basilaris (Provancher), p. 443. 
24. Abdominal dorsum ferruginous (sutures of basal terga may be black); 
mesoscutellum shghtly convex (sometimes fairly strongly) ; mesoscutum 
with a black spot on each side; propleura black 25. 
Abdominal dorsum pale yellowish broAvn; mesoscutum with no black 
spots; propleura not black; mesoscutellum markedly convex, and 
elevated mellina (Norton), p. 452. 
25. Apical half of posterior femora color of body; basal terga on venter black; 
pectus almost entirely and pronotum in greater part black; hypercly- 
peus as a rule yellow; antennae beyond two basal segments black to a 
variable extent; sutures of basal segments of abdominal dorsum black 
xantha (Norton), p. 455. 
Apical half of posterior femora black except beneath ; basal terga on venter 
not black ; j^ectus with only small posterior mesal portion black ; hyper- 
clypeus color of body; antennae with no black, and sutures of basal 
terga not black; pronotum with only anterior portion black, and 
faintly macgillwrayi Smulyan, p. 454. 
Table for the Separation of the Males. 
(The general term pale signifies any color not black.) 
1. Abdominal dorsum black [in rufopecia rvfopecta (Norton) and rufopeda 
mellicoxa (Provancher) the black is not fully developed sometimes, so 
that some of the terga are pale, and in angulifera (Norton) there are 
small pale spots at the junctures of some of the terga] .2. 
Abdominal dorsum in part pale 6. 
Abdominal dorsum entirely pale. Abdominal dorsum pale yellowish 
brown; vertex and dorsal surface of thorax largely, and legs in part, of 
same color; pectus, and mesopleura almost entirely yellowish; dorsal 
surface of thorax with yellomsh markings; mesoscutellum markedly 
convex and elevated; a black spot on front above antennae in region of 
ocelli mellina (Norton), p. 453. 
2. Apical segments of antennae white, or j-ellowish white. Meso-epister- 
num markedly roughened; mesoscutellum in part wliite, and as a rule 
