350 HYMENOPTEEA OF AMERICA. [rART I 



tarsis ferrngineis. — % . Clypeopirii'orrni, nigroet llavo-vaiiegato ; ilagello 

 suUus iulvo. 



Odtjn. Tacubayve Sadss. Revue tie ZooL, 1857, 279, % . 



Total length, 8 nun. ; wing, (j mm. 



Quite small. Form quite slender and elongate, particularly 

 the abdomen, which is longer than head and thorax (S), more 

 elongate than in 0. totonacus. Head and thorax finely cribrose- 

 the former circular. Scutel parted by a groove. Metathorax 

 smooth, quite finely punctured, triangular, obliquely produced 

 posteriorly, convex, rather flattened, parted superiorly by a 

 groove, inferiorly having a very shallow flattened obsolete 

 fossettej the lateral edges sharp, arcuate, clothed with argenteous 

 pile. The articular valves of the apex not produced into long 

 spines. Abdomen cylindrical ; 1st segment convex-funnel- 

 shaped, narrow, longer than wide, as stiongly punctured as the 

 thorax ; having an obsolete transverse depression before its edge ; 

 2d segment much longer than wide, constricted at base, subtu- 

 berculate above at base ; its posterior margin arcuate, convex, 

 having a line of stronger punctures ; beneath near the base it 

 has a sort of transverse wrinkle. 



Black, shining, grayish-silky. Scape beneath, a spot on the 

 forehead, a post-ocular spot, anterior and posterior edge of pro- 

 thorax, a line on the post-scutel, and inferior ridges of metathorax 

 sulphur-yellow. Margin of the tegulse and a tubercle under the 

 wing, ferruginous. Post-tegular appendix black. Articular 

 valves of metathorax yellow. The first two abdominal segments 

 narrowly margined with sulphur-yellow ; the yellow margin of 

 the first continued on the sides along the lateral edges of the 

 segments (rather inferiorly); that of the 2d complete beneath. 

 Feet black; tibiae and tarsi ferruginous. Wings very slightly 

 smoky. 



% . Clypeus pyriform, rather bidentate, black, with two longi- 

 tudinal yellow bands, or yellow, with a central irregular black 

 band, and inferiorly margined with black. Scape of the antennae 

 fulvous beneath ; hook fulvous. Intermediate coxae spotted with 

 yellow. 



Var. Segments 3-6 margined with brown ; the 3d beneath 

 with a little yellow. 



Bess. a. diff. — Resembles 0. coyotus and totonacus, but not 



