62 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



Leucozona lucorum. (Plate III, figs. 6, Ga. ) 



Mnnca lucorum Liuu6, Fauna Suec, 1803, 1761. 



Conops praednclus Scopoli, Entoiii. Cam., 908. 



Syrphus lucorum Fabricius, Spec. lus., ii, 426, 25 ; Eutom. Syst., iv, 291, 46 ; Mei- 



gen. Syst. Besclir., iii, 313, 58 ; pi. xxx, fig. 27; Macqnart, Hist. Nat. Dipt, i, 



537, 8. 

 EristaUs lucorum Fabricius, Autl. 241,37; Falleu, Syrpb.,50, 1; Zetteretedt, 



Dipt. Scand., ii, 778, and A-iii, 316G, 1. 

 CheiJosia lucorum Walker, Ins. Brit., i, 281, 1; Curtis, Brit. Ent. , 753. 

 Leucozona lucorum Scbiner, Wieu. Ent. Monatschr., vi, 214 ; Fauna Austr., i, 299. 



Habitat. — Washington Territory! Canada (O. S.), Northern and Cen- 

 tral Europe. 



5,9. Length, 12™™. Antennae black, third joint oval; arista black. 

 Face gently concave below the antennae, the tubercle large, obtuse, 

 nearly as low down as the lower border of the eyes ; color concealed on 

 the sides beneath very dense white pollen, and yellowish white pile, the 

 middle part and the cheeks bright shining blue black, frontal triangle 

 less dusted. " Front in female yellowish anteriorly, gradually becom- 

 ing darker behind." Thorax opsique black, thickly covered with red- 

 dish yellow pile, ])eneath Avhich the dark greenish brown pollen leaves 

 three slender black stripes. Pile on the pleurae white, on the scutellum 

 bushy yellow or orange. Abdomen black, shining, the second segment 

 either wholly light yellow or wholly sub-opaque bluish gray, or light 

 yellow in the middle part and bluish gray on the sides, with a slender 

 black stripe on the middle not reaching the posterior margin; pile long, 

 abundant, yellow and black. Legs black ; tip of femora and base of 

 tibisB whitish yellow, sometimes almost wholly yellow. Wings hyaline 

 with a blackish brown spot, reaching from the base of third posterior 

 cell to the stigma; stigma darker. 



Two $ specimens, Washington Territory, Colorado. 



CATABOMBA. 



Lasiophiicus Rondani, Prodrome, ii, 137, 1857 (ex parte). 

 Catdbomba Osten Sackeu, West. Dipt., .325, 1877. 



Kather large species, closely resembling in appearance and structure 

 the genus Syrphus, except that in the male the eyes have an area of 

 enlarged facets above, the front in both sexes remarkably convex, and 

 the hypopygium of the male is very small, concealed entirely beneath 

 the fifth segment of the abdomen. Type of genus, C. pyrnstri Linn*^. 



In response to a request in regard to the claims of Lasiophticus Rond,, 

 for priority over Catabomba, as put forward by Bigot, Baron Osten 

 Sacken has kindly given me his views on the retention of Catabomba, 

 which I take the liberty of reproducing here nearly entire. 



"The genus Lasiophticus was characterized by llondani (Prod, ii, 

 137), thus: 'It shares the' characters of Syrj^hus and Platychirus, but 

 differs from the former in not having dilated front tibite and tarsi, from 

 both by more or less pubescent eyes.' Eleven sj)ecies were enumerated 



