CHARLES W. METZ. 107 



patch near apex; sagittae normal (flattened in figure), (fig. 16 is identi- 

 cal in form with this) . Seventh ventral plate with rather slender, 

 somewhat triangular wings, having rather short teeth in the comb-like 

 margin, which extends along about two-thirds of the length ; mem- 

 branous flap transparent, extending laterad, covered with fine hairs, 

 (fig. 38). Eighth ventral plate short; base normal; distal pedicel 

 narrow, ending in two rounded apical lobes, connected on one side by 

 a membrane ; lobes granular in appearance, possibly caused by short 

 spines, slightly haired at apex, (fig. 52). 



Typical Fe7>tale.— Agrees with male in general characters ; antennai 

 short and clavate, scape narrow. Punctures of thorax usually sparse 

 and often faint. Face marks broad irregular stripes filling most of 

 lateral areas, with often a spot on clypeus. Thoracic markings only 

 on tubercles ; legs with yellow only at base of tibise. 



Form MESILL^. 



Male — Differs from typical form as follows : Upper extension of 

 lateral face marks very short and stout, not curving around antennae ; 

 yellow stripe on scape broader and more conspicuous, (fig. 80). 

 Tegulae, tarsi, and a large part of tibiae yellow. Puncturation of 

 thorax more sparse and faint ; pits on propodeum more shallow and 

 inconspicuous ; first two abdominal segments distinctly punctured. 



Female. — Differs from typical form as follows : Lateral face marks 

 well developed, filling lateral areas, and extending to top of antennal 

 sockets ; large part of clypeus and often spot on supraclypeal area 

 yellow; two stripes on collar, tegulae, wing bases, front of fore tibiae, 

 large part of other tibiae, and all tarsi bright yellow. Puncturation of 

 head and thorax exceedingly delicate ; enclosure of propodeum smooth, 

 not pitted. 



Form SANicuL^. 



RTale. — Differs from typical form as follows : Scape broader at apex ; 

 yellow on face reduced to two narrow, irregular stripes on lateral areas, 

 an irregular stripe on clypeus, and a small spot on supraclypeal area, 

 (fig. 83). No yellow on thorax or legs, except base of hind tibiae. 



Female. — Has no yellow markings except, "a narrow line on each 

 side of face, (sometimes wanting), and base of tibiae." (Rob. Can. 

 Ent., 28:137). 



Variety magniclavis. 



Male — Differs from typical form in that upper extension of lateral 

 face marks project straight from lateral areas, then curve around an- 

 tennal sockets, and end in a large knob ; supraclypeal mark longer 

 also, (fig. 77, taken from paratype). 



Female. — Indistinguishable from "form mesillae". 



TRANS. AM. ENT. SOC, XXXVII. 



