NORTH AMERICAN HYMENOPTERA. 128 



rufous ; anterior and middle knees and sometimes tubercles yellow ; prothorax 

 and about tubercles with a short ochraceous tomentum ; mesonotum nearly bare, 

 with close, rather coarse punctures anteriorly, becoming finer and inore sparse 

 posteriorly ; disc of metathorax short, irregularly striate at base, smooth and 

 shining. Wings hyaline, or nearly so ; second submargiual cell shorter than first, 

 narrowed about one-third towards marginal ; nervures testaceous, stigma fuscous, 

 tegulse testaceous. Legs blackish, scopa white. Abdomen shining, especially the 

 first segment, whicB is almost impunctate, segments broadly depressed, all except 

 first finely punctured, anal fimbria pale ochraceous. Length 6-7 mm. 



% . — ^More coarsely and closely punctured ; clypeus, a spot above, one on each 

 side of face, labrum. mandibles except tips, knees, anterior tibije in front and 

 tarsi, except apical joints, yellow ; tegulte a little darker, middle joints of flagellum 

 testaceous beneath : basal process of labrum slightly emarginate at tip. Length 

 5-6 mm. 



Hab. — Illinois ; seven females, two males. 



CalIiopsi!« coinpoisiitaruin Eob., Trans. Am. Ent. Soc. xx, 274. 9 . — 

 The male closely resembles the female, the nervures darker; scape and flagellum 

 long ; face below, antennse, labrum, mandibles, except tips, knees, tibiae, except 

 spot behind anterior pair and on each side of others, and tarsi, except claw joints 

 yellow. Length 5-6 mm. 



Hab. — Illinois ; sixty-six females, twenty six males. This species 

 is easily distinguished by its densely punctured mesothorax, the 

 punctures large and shallow. 



Noinacia affabilis Cr., % , Trans. Am. Ent. Soc. vii, 74, 1878 ; Nomnda 

 vindaCr. (nee Say), 9, Proc. Ent. Soc. Phil, ii, 284, 1863. Female.— Mandibles 

 simple, third joint of antennsB longer than fourth, flagellum dull ferruginous 

 beneath, darker above; mesonotum ferruginous or black, with four yellow or 

 ferruginous lines, large spot on pleura and on each side of metathorax yellow. 



% . — Third joint of antennse longer than fourth, apical segment of abdomen 

 entire, thorax more black, scape cylindrical, yellow beneath. 



This is a vernal species, and flies in the neighborhood of Carlin- 

 ville from the 18th of April to the 20th of June. 



Momada vincta Say. Bost. Jour, i, 401 ; Lee, edit, ii, 778, 1837. 



I have four females of this species which agree well with Say's 

 description. It is a little smaller than preceding, less strongly punc- 

 tured, more black, less pubescent, face below antennse ferruginous, 

 orbits yellow, third joint of antennae longer than fourth, flagellum 

 dusky in the middle, mesonotum black, with a narrow ferruginous 

 margin over tegulje, in one specimen with an indication of two me- 

 dian ferruginous lines ; otherwise resembling pj-eceding. 



TRANS. AM. ENT. SOC. XXII. MAY, 1895 



