42 



DIPTEKA. 



3. Phalacromyia bellula, sp. n., & . 



In structure like Volucella vesiculosa, Fabr., or V.paXlem, Wiedem., except that the marginal cell is narrowly 

 open. Eyes pilose, with enlarged facets above. Faee and front obscure yellowish-red ; cheeks wrth a 

 narrow brownish stripe. Antennaa luteous or reddish-yellow. Mesonotum deep brown, with metalhc 

 purple and bluish reflections and a yellowish translucency ; pile black. Abdomen small, flat, deep 

 brownish-black, the base somewhat yellowish-translucent. Legs brown or brownish-black ; hind meta- 

 tarsi yellow. Wings tinged with brownish-yellow. 



Length 6-7 millim. 



Hab. Mexico, Temax in North Yucatan (Gaumer). 

 Two specimens. 



A female from Teapa (H. H. Smith) has narrow clouds in the central cross-veins of 

 the wings, the face and antennse rather darker-coloured, and the bristles of the thorax 

 and scutellum more strongly developed. 



4. Phalacromyia vaga. 



Volucella vaga, Wiedem. Aussereur. zweifl. Ins. ii. p. 205 \ 

 Phalacromyia vaga, Schiner, Reise der Novara, Diptera, p. 355. 



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

 Brazil 1 , 



A female specimen from Xucnmanatlan I believe to be of this species, though there 

 are certain differences from the description. The front is green rather than yellow ; 

 the tip of the scutellum is only a little blackish, and has no impression (as one would 

 infer is the case from Schiner's remarks) ; the femora are not " griinlich ; " and there 

 are narrow brown clouds on the cross-veins at the middle of the wing. Another female 

 specimen, while agreeing closely with the foregoing in other respects, has the front and 

 median facial stripe deep black ; it is from Irazu, Costa Rica {Rogers). 



5. Phalacromyia virescens, sp. n., $ . 



Face and front light yellowish-green ; cheeks more yellow, with a narrow brown stripe. Front narrow ; 

 the crescentic spaces very narrow. Antennee more than a third of the length of the face, light reddish- 

 yellow ; third joint not excised ; arista well plumose, more than twice the length of the third joint. 

 Face projecting downward and forward, resembling that of Volucella pfillens, Wiedem. ; strongly 

 concave below the antenna3, with a rounded prominent tubercle. Thorax yellow ; the mesonotum tinged 

 with grassy-green ; pile of mesonotum short, black ; scutellum more strongly green, grooved before its 

 apex ; sides of the scutellum and postalar callosities with black bristles ; the bristles of the thorax 

 elsewhere light-coloured. Tegula? with black cilia. Abdomen short, flat, in colour strongly grass-green, 

 the basal segments more translucent yellowish. Legs : femora, except their brownish tip, light greenish- 

 yellow ; tibiae and tarsi brown or brownish-yellow, the terminal joints of the tarsi blackish. Wings tinged 

 with greenish-yellow, more strongly so in front ; a small brown stigmatic spot ; cross-vein near the base 

 of the discal cell. 



Length 9 millim. 



Hab. Guatemala, El Tumbador, 2500 feet (Champion). 

 One specimen. 



