336 TIYMENOPTERA OF AMERICA. [PART I. 



segmentorum limbo, pallide-flavis ; pedibus nigris, genibus, tibiis 

 autice tarsisque subtus luteis. — £. Clypeo emargiuato, tlavo ; anteunis 

 subtus fulvis; scapi fascia llava ; alis infuinatis. 



Odyn. Inca Sauss. Rev. de Zoul. XXII, 1870, 105, 29, $ %. 



Total length, 7 mm. ; wing, 5.5 mu*. 



?. Small. Thorax convex, narrowed posteriorly, margined 

 and angulate anteriorly. The whole insect densely and about 

 equally punctured, the abdomen as well as the thorax. Meta- 

 thorax velutinous, truncate a little behind the post-scutel, having 

 a rather wide cavity, which is punctate, rather margined; the 

 lateral ridges salient, forming nearly a blunt angle on each side. 

 First abd. segment small, cup-shaped, slightly depressed above, 

 its punctures not stronger than on the 2d; this is constricted at 

 base, subtuberculate at base above, quite cribrose; the punctures 

 a little stronger behind than anteriorly. 



Black, grayish-silky. A frontal and post-ocular spot, anterior 

 margin of prothorax, a spot under the wing, tegulae, a fascia on 

 the post-scutel, and the margin of all the abdominal segments 

 pale-sulphur yellow ; the fasciae of the segments 1-2 the widest. 

 Anus black. Feet black; tibia?, knees, 1, 2, and tarsi, pale yel- 

 low ; tibiae black behind ; tarsi obscure above. Wings smoky. 



% . Clypeus polygonal-pyriform, notched and bidentate, pale 

 yellow. Mandibles black. A little carina between the antennae. 

 Sinus of the eyes margined with yellow. Antenna? fulvous 

 beneath ; the scape yellow beneath ; the hook fulvous. 



Bess. a. cliff. — This approaches the 0. Kennicottianus, by its 

 form and its pale ornaments, although not as pale; but the scutel 

 is not parted by a groove, the metathorax not so rough; the first 

 segment is smaller, not so coarsely punctured, and the 2d is as 

 coarsely cribrose as the first. 



Ilab. Peru (E. Norton. Taken by H. Edwards). 



ft Excavation of metathorax smaller and rounded. 



135. O. Mystecus Sahss. — Niger, flavo-pictus ; clypeo, thorace et \o 

 abd. segmento crasse cribrato-punctatis ; secundo segmento polito, 

 sparse et magis tenuiter punctato. margine impresso et crasse punctato; 

 capitis lnaculis, pronoti macnlis 2, post-scutello abdominisque segmen- 

 torum l'-3' margine, flavis ; primi fascia latiore ntrinque aucta, 2 a subre- 

 panda, 3 a tenuissima, % incompleta ; pedibus nigris artubus subferru- 



