ICHNEUMON-FLIES, PART 2 1 EPHIALTINAE 425 



at or a little beyond spiracle of first tergite; median longitudinal 

 membranous streak of tergites 3-5 extending about 0.25 the length 

 of the tergite; apicolateral angles of tergites 3-5, 75° to 90°. 



Head yellow, a band between tops of eyes (enclosing ocelli) and 

 a band of variable width along upper part of occipital carina, dark 

 brown; mandible blackish apically, brown medially, and yellowish 

 basalty; antenna dark brown, paler below, the scape yellowish in 

 front; thorax blackish brown; propleurum except above, broad upper 

 margin of pronotum, variable marks along front, lower, and hind edges 

 of pronotum, a pair of median longitudinal stripes on mesoscutum, 

 a narrow stripe on mesoscutum next base of front wing, scutellum, 

 postscutellum, subtegular ridge, a large area occupying most of 

 posterodorsal half of mesopleurum, broad longitudinal sublateral 

 blotches or stripes on propodeum, and narrow stripe along poster- 

 odorsal margin of metapleurum, yellow; front and middle legs yellow, 

 the last segment of their tarsi yellowish brown, the middle coxa 

 largely blackish brown except dorsally, the middle first trochanter 

 partly blackish brown, and the basal part of middle femur partly 

 dark brown or blackish; hind coxa blackish, yellow above; hind 

 trochanters yellow, the first trochanter usually dark brown basally; 

 hind femur blackish brown, its base narrowly and its apex broadly 

 yellow; hind tibia and tarsus yellowish, the apex of tarsus brownish; 

 abdomen very dark brown; wings subhyaline, the front wing faintly 

 infuscate apically. 



Female: Front wing 15 to 30 mm. long; cheek about 1.1 as long as 

 apical width of mandible; median part of apical edge of first sternite 

 just in front of spiracle of first tergite; apicolateral angles of fourth 

 and fifth tergites about 105°; fourth tergite with fine, rather dense 

 punctures basally and ventrally, the rest with fine, indistinct, sparse 

 punctures; ovipositor sheath about 3.7 as long as front wing. 



Black. Head yellow with a narrow brown band between tops of 

 eyes (enclosing ocelli) ; mandible blackish, its base yellow; palpi and an- 

 tenna yellow; thorax sometimes with a small yellow spot on postero- 

 dorsal corner of pronotum, rarely with yellow markings on some or 

 all of: subtegular ridge, scutella, and a pair of narrow median longi- 

 tudinal stripes on mesoscutum; coxae black; trochanters black except 

 that front trochanters are more or less brown or yellow; front femur 

 yellow; middle and hind femora black, the middle femur and sometimes 

 the hind femur yellow at apex; tibiae and tarsi yellow, the tarsi brown- 

 ish apically; wings hyaline with the apex of front wing faintly infus- 

 cate, or entirely black, according to the subspecies. 



This is the largest Nearctic iclmeumonid. Females measure up to 

 4.0 cm. in length without the ovipositor and up to 16 cm. with the 



52652T— 60 28 



