184 AMERICAN HYMENOPTERA. 



of thorax and tlie sides of tlie nietatliorax and niesothorax entirely black ; meta- 

 thorax smooth, or almost smooth ; orbits often yellowish ; the hortlers of the 

 protho7-ax. a large mark under the wings, anterior angles of the soutellura, post- 

 scutellum or only its anterior border, as well as two lunate spots on the meta- 

 thorax, suI]»hur-yellow ; on each edge of the metathorax on the sides, a yellow 

 mark often connected with the mark on the posterior plate; tegulte often yel- 

 lowish; base of the first two segments of the abdomen often black; terminal 

 borders of the first, second and third segments yellow. Legs black, ends of the 

 femora, tibiie and tarsi yellow or red, posterior tibiae black, except the base, which 

 is yellow. Wings of a uniform gray tint. Length 14 mm. 



Var. A.--Mesotiiorax black, with two red marks; metathorax entirely red. 



Var. B. — Thorax entirely black; first segment of the abdomen reddish blacky 

 bordered with yellow, the second red, its base black, its border glaucous yellow, 

 yellow on the edges, a little black on the front of the border, the others black ; 

 the third and fourth bordered with greenish yellow, on each edge an irregular 

 red marginal mark ; terminal segment reddish. Legs varied with red and yellow. 



Hab. — United States, Mexico. 



P. fuscatus exilis Sauss. %. — Head and thoiax black; face whitish yel. 

 low ; posterior orbits and the space between the eyes of the same color ; mandi- 

 bles sulphur-yellow, with a black dot at their base; antenuie black, ferruginous 

 beneath, except at the end ; the two edges of the prothorax bordered with sulphur- 

 yellow or ferruginous; anterior border of the postscutellum and two lines on the 

 metathorax sulphur-yellow, as well as the articular valves. Abdoineu black, all 

 the segments bordered with sulphur-yellow, the second bearing on each side a 

 round point of red, and the first often two yellow points in front of the angles 

 of the border of this segment; end of the abdomen often ferruginous. Legs 

 ferruginous, under or posterior side of the femora black; posterior legs a little 

 brown ; front of the coxse yellow, which color prolongs itself onto the front of 

 the thoracic segments placed above the cox?e. Wings transparent, washed with 

 yellow. Length 13 mm. 



Var. A. — Prothorax and metathorax black; the first segment of the abdomen 

 bordered with yellow. 



Hub. — Nortli America. 



P. pallipes Lepel. 9 • — Head black, with the mandibles, the convex cly- 

 peus, except the edge, a broad stripe behind the eyes, the sinus of the eyes with 

 a line extending to the clypeus, ferruginous ; antennse black above, ferruginous 

 beneath. Thorax black ; posterior edge of the prothorax and the tegulse fei'ru- 

 ginous. Abdomen black, the first segment with a pale yellow tern)inal border; 

 all the coxse, the greater part of the femora and the outer side of the tibise black, 

 the rest of the legs ferruginous or dull yellow. Wings smoky brown ; some 

 specimens have a small spot under the base of the fore wings, two points some- 

 times extended into a line on the front of the scutellum, a similar line on the 

 postscutellum, and sometimes a longitudinal stripe on ea(th side of the median 

 dorsal furrow of the metathorax yellow; occasionally specimens are found in 

 which all the abdominal segments above and beneath have a narrow terminal 

 border; the clypeus is sometimes black and the markings yellow instead of fer- 

 ruginous; a few specimens have a ferruginous spot on each side of the second 

 abdominal segment and occasionally traces may be found on some of the other 

 segments. Length 21 mm. 



