COLORATION IN POUSTES. 8 1 



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. fuscatos exilis Sauss. 



Male. Head and thorax black ; face whitish yellow ; posterior orbits and the 

 space between the eyes of the same color ; mandibles sulphur yellow, with a black 

 dot at their base ; antennae 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. Abdomen black, all the segments bordered with sul- 

 phur 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 coxae .yellow, which 

 color prolongs itself onto the front of the thoracic segments placed above the coxae. 

 Wings transparent, washed with yellow. Length 13 mm. 



Var. A. Proth6rax and metathorax black ; the first segment of the abdomen 

 bordered with yellow. 



Hab. North America. 



P. pallipes Lepel. 



Female. Head black, with the mandibles, the convex clypeus, except the edge, 

 a broad stripe behind the eyes, the sinus of the eyes with a line extending to the 

 clypeus, ferruginous ; antennae black above, ferruginous beneath. Thorax black ; 

 posterior edge of the prothorax and the tegulse ferruginous. Abdomen black, the 

 first segment with a pale yellow terminal border ; all the coxae, the greater part of 

 the femora, and the outer side of the tibiae 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 sometimes extended into a line on the front of 

 the scutellum, a similar line on the postscutellum, and sometimes a longitudinal 

 stripe on dach side of the median dorsal furrow of the metathorax yellow ; occa- 

 sionally 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 ferruginous ; 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. 



Male. Differs from the female in having the clypeus very flat, all the face, the 

 breast and the coxae beneath, yellow ; the front of the femora reddish yellow ; the 

 underside of the antennae yellow or reddish yellow. Length 20 mm. 



Worker. Similar to the female, but somewhat smaller. Length 18 mm. 



M. de Saussure has given the following descriptions of varieties : 



Var. Worker. Two yellow lines on the metathorax. 



Var. A. Border of the tegulae indistinct, first segment of the antennae red ; 

 postscutellum ornamented with two yellow points. 



Var. B. Abdomen black, border of the second segment unmarked, the lateral 

 spots red. 



Var. C. Prothorax, clypeus, and border of the third segment of the abdomen red. 



Var. D. The mark under the wings, two points on the scutellum yellow ; meta- 

 thorax with two yellow lines. 



Var. E. Marks of the abdomen large, melting with the borders, which are red. 



Var. F. All the segments of the abdomen bearing a red mark on each edge. 

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