March, 1919.] BRUES : NORTH AMERICAN SeRPIIID.E. H 



Petiole of abdomen not longer than broad 17 



17. Propodeum strongly narrowed behind ; antennae not pale at base. (Fig 



simplicior Brues. 

 Propodeum gradually narrower behind ; antenna? pale yellow at base. 



pallidicornis n. sp. 



18. Propodeum with a strong carina, especially prominent at the apex of its 



horiz6ntal face, with large, smooth areas basally carinatus n. sp. 



Propodeum with the median carina evident, but not strong; basal smooth 

 areas not clearly defined ; head strongly narrowed below toward the 

 mouth parvulus n. sp. 



19. Petiole smooth above and beneath grandis n. sp. 



Petiole longitudinally striate above and beneath longiceps Ashm. $. 



E. canadensis and E. simulans Ashmead are not included in the 

 above table. E. californkus Holmgren is also omitted, as I cannot 

 identify it among the numerous forms from the west which have 

 the flagellar joints dentate in the males. The form referred to this 

 species by Ashmead 7 is evidently not Holmgren's species and is, I 

 believe, the one described on a later page as E. asJuncadi sp. now 



Exallonyx similis new species. (Fig. 11.) 



$. Length 2.5-3 mm. Black; tegulse, and legs and antennae in part, 

 yellow ; antennae brownish yellow at base, darkened beyond the middle and 

 fuscous toward apex ; legs brownish yellow, the femora above, and hind tibiae 

 toward apex, dark ; middle and hind coxae piceous, except at apex. Head 

 about as long as broad, gradually constricted behind the eyes. Eyes sparsely 

 pubescent, removed by slightly more than their width from the posterior 

 margin of the head when seen from the side ; malar space as long as the width 

 of the eye, without furrow ; anterior margin of clypeus straight. Antennae 

 reaching to base of abdomen ; scape twice as long as thick, narrowed at base ; 

 first flagellar joint slender, three times as long as thick at apex ; second, third 

 and following each scarcely shorter than the preceding, but growing stouter ; 

 second two and one half times as long as thick; penultimate twice as long as 

 thick. Mesonotum long and narrow, highly polished ; groove at base of scu- 

 tellum broad and shallow. Propodeum with long horizontal face, abruptly 

 declivous behind ; rugose-reticulate on the sides and behind ; with a strong 

 median carina above, on each side of which is a smooth space that extends to 

 the top of the declivity. Pro- and mesopleurae entirely smooth except for 

 several striae on the mesopleura below and in front of the upper raised por- 

 tion ; metapleura rugose below, shining on upper third. Petiole of abdomen 

 a little longer than wide, rugose above, coarsely striate below ; second segment 

 angularly incised at base, with a median stria as long as the petiole and sev- 

 eral short lateral striae; ovipositor acutely pointed, but little curved, as long 

 as the hind metatarsus, sparsely punctate. Legs rather slender, longer spur 



"Bull. U. S. Xat. Mus., Xo. 45. P- 338 (1893). 



