102 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



Mesograpta geminata. (Plato TV, fijj^s. 5, 5a.) 



Scaeva fifmiuala Say, J. Acad. Phil., iii, 02, 7; Coiupl. Wr., ii, 80. 



Syrphiis f/tminatus Wiedemann, Aiiss. Zw. Ins., ii, 145, 50, 



Syrjjlias interrogans Walker, Dipt. Saund., 238. 



Eumerus jyrivtrnun Walker, I.e. 225. 



Toxomerui notataa Macquart, Dipt. Exot. 5® Suppl., 93, pi. v, fig. 4. 



Mesigramma fjeminaia Scliiner, Novara Exped., 347, note. 



Menof/rapfa qeminaia O. Satken, Bull. Bnfl". Soc. N. Sci.; Cat. Dipt., 125. 



Toxomerns geminatua Willi.stou, Proc. Am. Phil. Soc, xx, 310. 



Habitat. — Atlantic and Pacific States!, South America (Scliiner). 



$ , 9 . Length, 5 to 6™"". Face, frontal triangle, and anteunffi, light 

 yellow, the face with white pollen on the sides, the antennae sometimes a 

 little brownish. Front in female much narrowed above, shining black, 

 narrowly yellow on the sides on the lower half. Posterior orbits thickly 

 whitish dusted. Dorsum of thorax shining black, with opaqne linear 

 stripes, the lateral stripes entire, the median cinereous strii)e only mod- 

 erately distinct. Pleurse shining greenish black ; an oval yellow spot 

 on the meso-pleurae, and a smaller more whitish one below it, narrowly 

 separated. Scutellum with an entire yellow margin. Abdomen broad- 

 est at the tip of the third segment; broadly flattened oval in the female; 

 shining black, variable, usually with yellow markings as follows: first 

 segment at the base ; second segment with a narrow median cross- 

 band, attenuated in the middle and interrupted; third and fourth seg- 

 ments with a slender median stripe, broader toward the front, and a 

 pair of large spots on the anterior margin, on the third dilated behind 

 on the ends ; on the fourth rather deeply marginate on each side be- 

 hind, the ends rounded and extending backward; fifth segment with 

 the anterior angles yellow and sometimes two projections from the an- 

 terior margin near the middle ; hypopygium reddish yellow, on the half 

 above shining black. In other specimens the yellow cross-band of the 

 «econd segment may be confined to a small spot on each side or wholly 

 wanting, the median stripe of the third and fourth segment wholly 

 wanting, on the fourth only four small anterior spots, those on the an- 

 terior angles of the fifth very small, and the hypopygium almost wholly 

 black. Front and middle legs yellow; hind femora black, except the 

 base, in the female less extensive, often only a brown ring; hind tibiae 

 mdistinctly biannulate with brown; and the hind tnrsi brownish. 

 Wings nearly hyaline, veins mostly black. 



Twelve specimens from California, Washington Territory, and Con- 

 necticut. 



Mesograpta aurulenta, n. sp. 

 Habitat. — San I>oniingo ! 



$. Length, 5.5'""'. Face and frontal triangle light translucent yel- 

 low ; cheeks narrowly shining black, behind and on the posterior orbits 

 with a greenish tinge, covered with light yellowish pollen. Eyes briefly 

 contiguous; vertical triangle black, elongate; ocelli remote from the ver- 

 tex. Antennte yellow; somewhat blackish above. Lateral stripes of tho- 



