24 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 68 



SENOTAINIA RUBRIVENTRIS Macquart 



Senotainia rubriventris Macquart, Dipt. Exot. Suppl., vol. 1, p. 167, 1846. 

 Type from Galveston, Tex. — Coquillett, U. S. Bur. Ent., Tech. Ser., 

 No. 7, p. 80, 1897.— OsBORN, Ohio Naturalist, vol. 7, p. 38, 1906.— 

 Smith, Ins. of New Jersey, p. 778, 1909. — Johnson, Bull. Amer. Mus. Nat. 

 Hist., vol. 32, 1913.— Walton, Proc. U. S. Nat. Mus., vol. 48, p. 182, 

 1914. — Aldrich, An. Ent. Soc. Amer., vol. 8, p. 82, 1915. — Reinhard, 

 Ent. News, vol. 30, p. 284, 1919.— Brimley, Ent. News, vol. 33, p. 25, 

 1922. 



Miltogramma decisa Townsend, Ent. News, vol. 3, p. 81, 1892. 



Male. — Front at narrowest 0.25 of head width (ineasurernents of 

 four as follows: 0.25, 0.25, 0.25, 0.2G) ; frontal vitta brown, at base of 

 antennae scarcely twice width of lov\^est ocellus, widening to two and 

 one-half times width of parafrontal at ocellar triangle; one reclinate 

 and two proclinate orbital bristles; front nearly destitute of bristly 

 hairs; vibrissae length of second antenna! joint above front edge of 

 oral margin, separated by distance equal to one and one-half times 

 second antennal joint; facial ridges bare excepting one or two small 

 bristles above the vibrissae; region lateral to vibrissae without scat- 

 tered bristly hairs; antennae yellow, extending three-fourths distance 

 to vibrissae; third joint one and one-half to two times as long as the 

 second; arista thickened on basal two-fifths, penultimate joint as 

 broad as long; parafacials bare; palpi j^ellow; in profile, bucca one- 

 tenth to one- twenty-fifth eye height and distinctly narrower than 

 parafacials; eye more than half as wide as high. Thorax gray pol- 

 linose over black, with three narrow median vittae; two strong 

 sternopleural bristles present and four postsutural dorsocentrals of 

 which the anterior two are small or absent altogether; scutellum with 

 thi'ee pairs of marginals of equal size. Abdomen with intermediate 

 segments and lateral posterior part of first, rufous, the remainder of 

 the first and the fourth black, frequently with a dorsal triangle of 

 black on intermediate segments, last three segments thinly wliitish 

 pollinose; second segment bearing a median marginal pair of bristles, 

 third and fourth each with a marginal row of about eight. Genitalia 

 (pi. 2, fig. 8) black, with the appearance, in repose, of being too large 

 to fit into tip of abdomen; inner forceps shining black, moderately 

 short and blunt, with sharp, stout tips, united to apex save for minute 

 apical cleft, in profile, convex on outside, nearly straight inside; outer 

 forceps brown, distinctly shorter than the inner pair, strongly rounded 

 over at the tip into a rather bluntly-pointed hook, directed cephalad 

 like the inner forceps; sides of fifth sternite with angular apex and 

 bearing appressed, bristly black hairs to the tip. Legs black; 

 middle tibia with a single bristle on outside near the middle; hind 

 tibia with a row of four unequal bristles on outside, not extending 

 far beyond middle; hind femur without villosity on inner proximal 



