NORTH AMERICAN HYMENOPTERA. 275 



Mandibles bideutate Bf. niaciilata. 



Mandibles simple. 



Fourth joint of antenufe nearly twice as long as third, seen from beneath, 9 



abdomen 7-spotted Sf. cressoiiii. 



Fourth joint of antennse hardly longer than third. 



Last abdominal segment of % bifid, abdomen of 9 4-spotted N. sayi. 



Last abdominal segment of % entire, abdomen of 9 7-spotted. 



N. iiit<>$;ra. 

 Male unknown, abdomen of 9 not spotted ]V. iucerta. 



IVoniada maciilata Cr. 9.— Mandibles bidentate, fourth joint of an- 

 tenna little longer than third or fifth; head and thorax densely and coarsely 

 punctured, abdomen shining, rather sparsely and finely punctured; ferruginous. 

 apex of nmndibles, about the base of the antennae, about ocelli, cheeks beliind, 

 line in middle of mesouotum, broader line on metathorax, bases of cosit, and 

 sutures of thorax generally, bases of femora, hind tibiae within, hind metatarsi, 

 base of abdomen and apical margins of segments above and beneath, more or 

 less black or fuscous ; wings dusky, with usual pale lunule, nervures blackish, 

 stigma dull ferruginous, tegulaj pale ferruginous, spot on each side of segments 

 1-5 yellow, those on last two segments small and rounded, or wanting, or, as in 

 one specimen, only a small spot on each side of second. Length 7-8 mm. 



"J, .— Antennal joints and mandibles as in female, head black, mandibles, ex- 

 cept tips, clypeus, inferior orbits extending narrowly on sides of face as high as 

 ii'sertion of antenna? yellow, scape dull yellow beneath, flagelium pale ferru- 

 ginous, with a fuscous line above more marked towards base; spot at summit of 

 eyes, sometimes wanting, ferruginous or yellow; thorax black, line on collar 

 more or less interrupted, tubercles and tegulse ferruginous or yellow ; mesonotum 

 black, sometimes with two or four longitudinal ferruginous lines, scutellum en- 

 tirely black or ferruginous, or with two ferruginous or yellow spots, post-scutel- 

 lum black, ferruginous or yellow; pleura black, sometimes with a large yellow 

 or ferruginous spot below, with or without a small ferruginous spot above it; 

 wings hyaline, apical margins clouded ; legs ferruginous, sometimes varied with 

 yellow, femora more or less black at base l)eneath, especially the posterior pair, 

 hind tibiae, sometimes fuscous within; abdomen ferruginous; base, hasal and 

 sometimes apical margins of segments fuscous, band or two spots on first segment 

 often wanting, and transverse bands on remaining segments, more or less in- 

 terrupted on the disc, yellow, apical segment bifid. Length 6-8 mm. 



iZ(x6.— Illinois ; fourteen female, thirty-two male specimens. 



Noiuada cre!$!«onii 9. -Mandibles simple; fourth joint of antennaj 

 nearly twice as long as third ; dull ferruginous, antenna; fuscous above, apex of 

 mandibles, about antennae and ocelli, cheeks posteriorly, sutures of thorax, me- 

 dian stripe on mesonotum and on metathorax, broad baud from wings to middle 

 coxae, bases of femora and hind metatarsi, base of abdomen and apical margins 

 of segments black or fuscous; wings hyaline, marginal cell and apical margins 

 clouded ; abdomen finely punctured, segments 2-3 with a spot on each side, 

 fourth with two spots on each disc, fifth with transverse spot, all yellow Leno-th 

 8-9 mm. " " '^ 



-^ .—Resembles the female; face below antennae, labrum, mandibles except 

 tips, scape beneath and inferior orbits yellow; superior orbits ferruginous, flagel- 

 ium ferruginous, with a fuscous line above; mesothorax mainly ferruginous with 



TBANS. AM. ENT. SOC. XX. 



OCTOBER, 1893. 



