276 CHARLES ROBERTSON. 



black markings ; metathorax black ; anterior legs yellow, especially at the kuees 

 posterior pairs ferruginous, femora at base beneath, more extensively on posterior 

 pairs, and hind metatarsi blackish; abdomen ferruginous, black at base; spots 

 on each side of segments 1-5, often wanting on first and united on fifth, yellow^ 

 sixth segment with a trans^'erse spot, apical segment bifid. Length 7 — 9 ram. 



Hah. — Illinois ; four female, six male specimens. This is the 

 var. ^> of Cresson's N. viaculata. 



Noiiiada integra 9 • — This species closely resembles the preceding, but 

 is distinguished by its antennae having the fourth joint no longer than the third, 

 by its smaller size, the ferruginous color more pale, wings more faintly dusky at 

 tips ; abdomen with ornaments the same, but the spots pale yellowish, or whitish. 

 Length 7 mm. 



% . — Apical segment of abdomen entire; head black, apex of clypeus, inferior 

 orbits, scape beneath, mandibles, except tips, yellow; flagellum pale ferruginous, 

 with a fuscous line above, wings faintly dusky at tips; thorax black, tubercles 

 and tegulse exteriorly yellow, sometimes two spots on scutellnm yellow or ferru- 

 ginous, anterior legs pale ferruginous, hind femora as usual largely black ; abdo- 

 men pale ferruginous, black at base, segments 2-5 with whitish spots on each 

 side, sometimes the spots are wanting, except on second and third, sixth with a 

 transverse spot. Length 6-7 mm. 



Hab. — Illinois ; one female, eight male specimens. This is easily 

 distinguished by its small size, equal joints of flagellum, whitish 

 ornaments and entire apical segment of male. 



Noiiia<ls); sayi 9 . — Mandibles simple, third joint of anteunje shorter than 

 fourth ; color ferruginous with the usual black marks characteristic of the group ; 

 segments 2 and 3 of abdomen with a rounded yellow spot on each side and some- 

 times two small spots on fifth segment. Length 5-7 mm. 



% .—Resembles the female ; apex of clypeus, inferior orbits, mandibles except 

 tips, and labrura yellow; scape beneath and flagellum except line towards base 

 above pale ferruginous, scape sometimes yellow beneath ; thorax black, tubercles 

 and tegulte pale ferruginous; prothorax black, or with two ferruginous spots: 

 scuteilum black, or sometimes with two ferruginous spots; legs pale ferruginous, 

 hind femora largely black ; abdomen, except base, ferruginous, segments 2 and 3 

 each with a yellow spot on each side, sometimes a small spot on each side of 4 

 and 5 and a transverse spot on 6, apical segment bifid. Length 5-6 mm. 



Hab. — Illinois ; eight female, fifteen male specimens. This spe- 

 cies may be distinguished from the preceding by its smaller size, the 

 4-spotted abdomen of female and the bifid apical segment of the 

 abdomen of the male. 



Osniia coujiinctoides %. — This species closely resembles the male of 

 0. coHJUHCta Cr. (^ 0. A-dentata Cr. % ). It is about the same size, but perhaps 

 a little longer ; the same punctuation, also the two tubercles, one above the other, 

 just above the insertion of the antennse; the color more bluish or purplish ; the 

 sixth segment with lateral teeth, which instead of being acute as in 0. conjuncta 

 % , are broad and obtuse and prodViced downwards; the middle lobe of this seg- 

 ment more reflexed or cariuate, truncate and slightly emarginate, or rounded, 

 apical segment as in 0. conjuncta. Length 8-9 mm. 



Hab. — Florida ; five males taken in Citrus County. 



