DIPTEKA. 



19. Volucella chsetophora. (Tab. I. figg. 15, J ; 15 a, head ; 15 b, antenna.) 



Volucella chatophora, Willist. Synopsis N.-Am. Syrphidae, p. 149 \ 



Hab. Mexico, Acapulco in Guerrero (H. H. Smith), Isthmus of Tehuantepec {coll. 

 Riley 1 ), Temax in Northern Yucatan (Gaumer). 



Two specimens. The front is black-pilose, not "black, pilose." There is some 

 shorter whitish pile on the mesonotum, and the legs may be deep red or reddish-black, 

 and the abdomen deep blue. There are violaceous reflections on the mesonotum. 



20. Volucella comastes, sp. m, $ . 



Front brown, yellow at the vertex and on the sides helow ; pile black. Face light yellow, with a broad brown 

 stripe ; in profile nearly perpendicular, with an obtuse tubercle. Cheeks with a broad blackish stripe. 

 Antennje at least a third of the length of the face, dark brown, the basal joints more reddish ; third joint 

 gently widened at the base ; arista not thinly plumose. Mesonotum shining blue-black, the sides yeUow 

 and reddish, and with a light yellow ge minate spot in the middle behind. Pleurae brownish-black ; a light 

 yellow spot on the mesopleurse. Margin of scutellum, postalar callosities, and lateral margins of meso- 

 notum with black bristles ; a transverse row of bristles in front of the scutellum. Scutellum translucent 

 brownish-yellow, yellow at the base and margin. Abdomen : first segment more or less brown ; second 

 segment very light translucent-yellow, with a narrow posterior dark brown or black band ; third segment 

 black, with an interrupted yellow band in front. Legs brownish-black ; the distal end of the femora, 

 basal part of the tibise, and basal joints of the tarsi reddish. Wings nearly hyaline, clouded on the 

 anterior part, the clouds forming two darker spots — one near the tip, the other, the larger, at the middle. 



Length 9 millim. 



Hab. Mexico, Orizaba (H. H Smith and F. H. Godman). 



Two specimens. One might suspect this to be V. variegata, Bigot, save for the 

 abdominal markings and the size. 



21. Volucella amethystina, 



Volucella amethistina (sic), Bigot, Ann. Soc. Ent. Fr. 1875, p. 479 \ 

 Hab. Mexico \ Presidio (Forrer). 



This striking species is easily recognizable from Bigot's description. The head is 

 rather broad, the face produced acutely downward ; the third antennal joint of the 

 female is not at all coarctate; the scutellum is not impressed before its apex, the 

 bristles at the tip are remote, and there is an inconspicuous row of them before the 

 scutellum. 



22. Volucella tympanitis. 



Syrphus tympanitis, Fabr. Syst. Antl. p. 226 \ 



Volucella tympanitis, Wiedem. Aussereur. zweifl. Ins. ii. p. 200 3 ; Willist. Trans. Am. Ent. Soc. xv. 

 p. 275 3 . 



Hab. Mexico, Atoyac in Vera Cruz, Teapa in Tabasco (H. H. Smith) ; Panama, 

 Bugaba (Champion). — South Amekica 1 2 , Brazil 3 . 



Eight specimens, agreeing closely with others from South America. 



