AMERICAN HYMKXOPTERA. 221 



Aiicistroceriis sayi sj). nov. 



Black ; the clypeus, a mark filling the eye incision, narrowed helow, a longish 

 mark over the antennae, the top transverse, tlie upper two-thirds becoming grad- 

 ually nan-owed below, the narrowed lower iiart twice longer than wide, a line 

 on the top of the outer orbits, mandibles except at apex, a interrupted line, grad- 

 ually widened on the outerside, on the base of the thorax, two irregular marks 

 on the scutellunis, those on the postscutellum almost continuous, a large conical 

 spot below the tegulse, a line, with an irregular basal edge on the first abdomi- 

 nal segment, one obliquely dilated laterally on the second, a longish line grad- 

 ually narrowed on the innerside, on the sides of the second ventral and an 

 oblique spot, twice longer than wide, near the middle of the second, the apex of 

 the femora and the greater part of the tibiae, whitish-yellow. Wings hyaline, 

 the nervures and stigma black, the second recurrent nervure interstitial ; the 

 wings are tinged with violaceous. Underside of antennal scape whitish-yellow, 

 of the flagellum brown ; the hook short, half the length of the joint. % Length 

 5 mm. 



Clypeus wider than long, the puncturation strong, but not close, the incision 

 semicircular. Base of thorax transverse; the sides of the apex rough, rounded, 

 the lower edge projecting into stout triangular teeth. The first abdominal seg- 

 ment longer than it is wide at the apex ; it becomes gradually widened from the 

 base to the apex ; the second is longer than it is wide at the apex, the base nar- 

 rowed, the apex flat. The apex of the first is more coarsely punctured than the 

 rest, and has a short, wide, longitudinal furrow down the centre. 



A slender, longish species. 



Aiicistroceriis giiiinisoiiensiN Cam. 

 There is a S of this species from Denver, Colorado, and anotlier 

 from Durango, Colorado. The amount of rufous color on the 

 underside of the anteunse varies, as does also the size of the yellow 

 frontal mark. A % from Chimney (Julch, Colorado, has the wings 

 tinged distinctly with fulvous. 



Auci!>»troceru!^ tricliionotus Cam. 

 Invert. Pacifica, i, 120. 



The % only of this species has been descril)ed. The 9 li^^s been 

 sent by Pvoi'. Baker from Ormsby Co., Nevada, and from Berkeley 

 and San Miguel Co., Colorado. The underside of the antennal 

 scape is bright sulphur-yellow, the flagellum brownish at the apex 

 below. Clypeus as long as wide, strongly but not closely punctured, 

 pyriform, the apex not quite transverse, being slightly incurved ; on 

 either side of it is a broad curved mark, narrower above than below 

 and reaching below to the middle; above the narrowed apex are 

 two small irregular marks. The pubescence on the head, thorax 

 and base of abdomen is long, dark fuscous and dense. The nieta- 

 notuni above has, on eitherside, a curved, not very strong keel. 



TRANS. AM. ENT. SOC. XXXIV. JULY. 1908. 



