96 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



lueut concealed; posterior margins of third and fourth segments yel- 

 low, fifth segment with a yellow triangle. Venter black, with three 

 narrow fasciic, and the hind margin of the fifth segment yellow. An 

 terior femora luscous, on their i)osterior sides fuscous black, on the 

 apical third yellow; hind femora fuscous black, base luteous, tip yel- 

 low ; tibiiu yellow, distal half of the hind ones fuscous ochraceous; 

 anterior tarsi luteous, hind ones ochraceous fuscous. Wings very 

 dilutely subinfuscate, costa broadly and of equal width, clouded with 

 fuscous. — Translation from Loew., 1. c. 



A single female from Virginia, for which I am indebted to the kind- 

 ness of Mr. Theo. Pergande, belongs, I believe, to this species, notwith- 

 standing the differences from Loew's description in the markings of the 

 abdomen and legs. It is a very striking species, and may perhaps be a 

 true Doros. 



An examination of the type specimen assures me that the male and 

 female here described belong together. 



ALLOGRAPTA. 



Allograpicf Osi&n Sacken, Bull. Buff. Soc. Nat. Sci. iii, 49, 1876. 



Elongate, small, bare species, thorax with yellow lateral stripes, the 

 abdomen with yellow bands, and on the fourth and fifth segments with 

 two slender median stripes and oblique side spot. Eyes in the male with 

 an area of distinctly enlarged facets on upper part. ^ celli as in Syrjjims. 

 Thorax without median cinereous dorsal stripe. In this latter and in 

 other respects as in Syrphus. Type of genus, A. obliqua S)St,y. 



TABLE OF SPECIES. 



Face w holly yellow, or in the middle only faintly brownish obliqua. 



"Face with a bluish black stripe, extending from the oral margin to the antennae." 



fracta. 

 Allograpta obliqua. 



Scaeva obliqua Say, J. Acad. Phil, iii, 89, 2; Compl. Wr, ii, 78. 



Syrphus obliquus Say, Amer. Ent., pi. xi ; Compl. Wr. i, 23 ; Wiedemann, Auss. 



Zw. Ins., ii, 138, 39 (translation from Say); Schiner, Novara Exped., 353, 43. 

 Syrphus securiferus Macquart, Dipt. Exot., ii, 2, 100, 22 ; id., ibid., ler Suppl., 139. 



(female). (Type compared by Osten Sacken.) 

 Sphocrophoria Bacchides Walker, List, etc. 594. (Type compared by Osten 



Sacken.) 

 Syrp}iu8 dimeiinus Walker, Dipt. Saunders., 235. (Type compared by Osten 



Sacken.) 

 Sipphus signatus v. d. Wnlp, Ti.jds. v. Eut.,x, 144, 15 ; pi. iv, fig. 12. 

 Allograpta obliqua Osten Sacken, Bull. Buff. Soc. Nat. Sci., iii, 49; Cat. Dipt., 



126 and note 214 ; v. d. Wulp, Tijds. v. Eut.,xxvi, 1, 33; pi. i, fig. 1. 



Habitat, — Atlantic and Pacific States! Argentine Eepublic (v. d. 

 Wulp). 



5,9. Length, G to 7'"'". Face yellow, often with a bluish reflection, 

 slightly brownish on the tubercle. Frontal triangle yellow ; front in the 



