322 VltOCEEDINaS OF THE NATIONAL MUSEUM. voi-.xxi. 



SYRPHUS BALTEATUS De Geer. 



Mmcu buUealu. Die (Jeer, JM('iii. iScrv. Hist. lus., 177(), VI, ji. IIU. 

 Miisca alleriiata ScniUAXK, Enum. Ins. Aust. Inclig., 1781, j). 418. 

 Scacva neciarea FAisiacius, Mant. Ins., 1787, II, p. 331. 

 Syrphus nectar'mns Wieuemaxn, Aus. Zweif. Ins., 1830, II, i>. 128. 



Five males and five females (No. 675), which are indistinguishable 

 from I^^nropeau specimens in the V. S. National Museum. Of the 

 synonymy j^iven above the liist two were first i)ublished by Meigen, 

 the third is by the writer. Wiedemann's specimens were collected in 

 China. 



SYRPHUS LATUS, new species. 



Female: Occiput and upper i)art of the front black, the lower part 

 of the front, antennae, face, and cheeks yellow ; front projecting forward 

 as far as the facial tubercle, except on the vertex densely yellowish- 

 gray pruinose, its short hairs and those of the antennae black, remain- 

 ing hairs of the head pale yellow; eyes densely hairy, proboscis brown, 

 very robust; third JoiiH of anteniuie oval, viewed from the inner side 

 slightly longer than the lirst two taken together, the latter subequal 

 in length ; arista bare. Thorax olive-green, somewhat polished, marked 

 with three bhuik vittae, the sides aiul scutelluiu yellow; hairs of thorax 

 and of base of scuitellum pale yellow, those at apex of scutellum black. 

 Abdomen suboi)a([ue, black, the first segment, anterior two-thirds of 

 the second except on the posterior two-thirds of the lateral margins, 

 also an arcuate fascia in front of the middle of the third, fourth, and 

 tilth segments, yellow, the lateral margins of the abdomen black or 

 brown; hind margins of the second and following segments yellowish- 

 brown, of the fifth yellow; second segment marked in front of the 

 middle with two arcuate lines which unite in the middle of the dorsum 

 and are prolonged to the black on the jwsterior margin; hairs of abdo- 

 men concolorons with the ground color. Legs yellow, hind tarsi largely 

 brown. Wings hyaline, strongly tinged with yellow, most distinct in 

 the costal cell; stigma i)ale yellow. Ilalteres, yellow. Length, 10 mm. 

 Two females (No. 080). A broad, robust species resembling Didea 

 faaciata. 



Type— No. 3991, U.S.N.M. 



SYRPHUS PORCINUS, new species. 



Male and female: Of the same form as latus, but dittering as follows: 

 Front wholly black, on its lower end marked with a polished black 

 spot; facial tubercle projecting much farther forward than the front, 

 hairs of face chiefly black, eyes bare, proboscis slender, third joint of 

 antennae slightly shorter than the first two, its ui»per edge and the 

 arista brown. Thorax not marked with black vittae. Abdomen of 

 male somewhat i)olished, yellow, a median vitta and the middle of the 

 hind margin of the first two segments, also the hind niargius of the 



