PIPIZA.— CHBYSOGASTER. 



7 



as long as wide, shorter than the first two joints together. Mesonotum and scutellum shining bronze- 

 hlack, with light-eoloured pile ; scutellum with a slender groove before its tip. Abdomen shining 

 bronze, rather thickly yellow-pilose ; second segment, except the sides, and a large spot on the third, 

 opaque black. Legs black, all the femora more or less shining metalfic above ; pile white ; the articula- 

 tions of the tarsi somewhat reddish. Wings broadly clouded distally ; a large, diffuse, brownish spot in 

 the middle ; posterior cross-vein and the last section of the fourth vein oblique, nearly straight. 

 Length 8 millim. 



Hab. Mexico, Xucumanatlan in Guerrero 7000 feet (H H Smith). 

 Three specimens. 



This species is a Pipizella in its narrowest sense, that is, it has the auxiliary vein 

 terminating before the anterior cross-vein. 



CHRYSOGASTER. 



Chrysogaster, Meigen, in Illiger J s Magazin, ii. p. 274 (1803). 



Orthonevra, Macquart, Hist. Nat. Ins., Dipt. (Suites a Buffon), i. p. 563 (1834). 



Campeneura, Rondani, Dipt. Ital. Prodr. ii. p. 163 (1857). 



Cryptineura, Bigot, Rev. et Mag. Zool. 1859, p. 308. 



1. Chrysogaster nitida. 



Chrysogaster nitidus, Wiedem. Aussereur. zweifl. Ins. ii. p. 116 \ 



Orthoneura nitida, Schiner, Reise der Novaraj Dipt. p. 368 \ 



Chrysogaster nitida, Willist. Synopsis N.-Am. Syrphidse, p. 35, t. 2. figg. 7, 7a\ 



Cryptineura hieroglyphica, Bigot, Rev. et Mag. Zool. 1859, p. 308 *. 



Orthoneura hieroglyphica, Loew, Centur. iv. uo. 58, nota, iu Berl. ent. Zeitschr. 1863, p. 306 5 . 



Hab. Noeth America \ New England 3 , Pennsylvania 3 , Virginia 3 , South Carolina 3 , 

 Kansas 3 , New Orleans 4 . — Mexico, Amula, Vera Cruz (H. H. Smith). — South 

 Ameeica 2 . 



Two specimens from Mexico, agreeing in all respects with others from the eastern 

 United States. 



2. Chrysogaster bellula. 



Chrysogaster bellulus, Willist. Trans. Am. Phil. Soc. xx. p. 304 \ 



Chrysogaster bellula, Willist. Synopsis N.-Am. Syrphid^e, p. 36, t. 2. figg. 6, 6 a\ 



Hab. United States, Washington 2 , California 1 % Colorado 1 2 .— Mexico, Ciudad in 

 Durango 8100 feet (Forrer), Patzcuaro (F. B. Godman). 



This species may be easily confounded with C. nitida. In addition to the differences 

 in the length of the second antennal joint, and in the facial profile, there is a distinctive 

 character to be found in the markings of the eye. In G. nitida the lines are laby- 

 rinthine above as well as below the subhorizontal line ; in C. bellula, on the contrary, 

 the two lines running to the orbital margin are parallel and only gently curved. 



