296 Annals Entomological Society of America [Vol. IX, 



Aprostocetus whitmani new species. 



Female: Length, 2.00 mm. 



Very dark metallic purple, the wings hyaline; scape, a little less than 

 the proximal fourth of the abdomen (except along the latero-dorsal 

 margin rather broadly) and the legs except all coxae and first two pairs 

 of femora (except at tip). Venation pale. Scape stout, its short bulb 

 purple; pedicel a little longer than wide at apex, a little longer than 

 club 3. Ring-joint large. Funicles 2 and 3 subequal, each twice longer 

 than wide, stout, 1 somewhat shorter, longer than the pedicel. Club 3 

 with a distinct terminal nipple; club 1 a little shorter than funicle 1, 

 longest of the club by a little. Mandibles tridentate. Sculpture usual; 

 a line of rather obscure punctures along the lateral margin of the scutum. 

 Propodeum and abdomen densely finely scaly, the former longer laterad, 

 with a distinct median carina and a very delicate, short, curved lateral 

 one from caudad (half or less complete). Cephalic femora more 

 broadly white at tip. Pedicel whitish, purple above at base. No 

 postmarginal vein, the stigmal moderately long. Abdomen conic- 

 ovate, pointed, somewhat longer than the rest of the body. Fore 

 wings broad. 



The male is the same but the abdomen is oval, fiat and short, the 

 scape compressed and dilated (uniformly, nearly, for its entire length), 

 purple above and below, the funicle is white, also the club except the 

 distal joint. Also, the cephalic femur is purple only dorsad centrally 

 and the middle one only centrally. The funicle is 4-jointed, the club 

 3-jointed and as in the female except the middle joint is longest. Funi- 

 cles 1-2 subequal, a half longer than wide, 2-3 subequal, each nearly 

 twice longer than wide. Club 2 subequal to funicle 2. 



Described from one male, eight females, reared from the 

 eggs of Physonota unipunctata, St. Paul, Minnesota (S. 

 Marcovitch) . 



Types: Catalogue No. 19936, U. S. N. M., the above speci- 

 mens on three tags plus a slide bearing a male and female head. 



Rhopalicus americanus new species. 



Female: Length, 3.00 mm. 



Bright metallic green, the legs, scape and pedicel reddish yellow 

 tinged centrally with brownish, the venation yellow, the fore wings 

 with a large fuscous blotch from the whole of the marginal vein, this 

 blotch oblique, rectangular (longer than wide, its sides parallel, its apex 

 reaching slightly beyond the middle of the wing and fainter) . Head and 

 thorax very finely punctate, the clypeus bidentate at apex. Antennas 

 inserted slightly below the middle of the face, 13-jointed with two 

 ring-joints (the second the larger), the club short, ovate; funicle 1 a 

 half longer than wide, subequal to the pedicel, 2 a little shorter than it, 

 3 and 4 subequal, each slightly longer than wide, the rest quadrate. 



