from the Rio Nauila^ State of Vera Cms, 33 



19. Belvosia hicincta^ R. D. 



One female, July 16, San Rafael. On flowers of the 

 Corclia sp. 



Third antennal joint hardly twice as long as second. 

 Facial ridges not ciliate, with some bristles not extending 

 halfway up. 



Length 15 millim. 



20. Belvosia hifasciata^ Fabr. 



One female, June 20, San Rafael. 



Third antennal joint three or more times as long as the 

 second. . Facial ridges ciliate, with strong bristles extending 

 up to a point opposite lowest frontal bristles. 



Length 11^ millim. 



I am aware that Dr. Williston has shown that there is 

 great variation in these two forms of Belvosia, and that inter- 

 gradations of all kinds exist. I think it is well, however, to 

 apply the two names and differentiate the forms when they 

 can be separated. When specimens are encountered which 

 cannot be so separated they should be mentioned individually, 

 with details as to their variation from the typical form. 



21. Phasiopteryx Bilimehij B. & B, 



One male, March 9, San Rafael. 



Length 7 millim. 



This specimen seems to be more robust and bristly than 

 van der Wulp's specimens described in the Biol.-Centr. Am., 

 Dipt. It differs as follows from van der Wulp's description 

 oi Neoptera (Biol. Centr.-Am., Dipt. ii. pp. 165-166) : — The 

 frontal bristles are not hair-like. There is a pair of short 

 decussate vibrissa?. The bristles on third and fourth abdo- 

 minal segments can certainly be properly called macrocheetce. 

 The wings agree well with description, except that the curva- 

 ture of fourth vein does not form a right angle, but is 

 rounded. Apical cross-vein is a little concave. The foot- 

 claws and pulvilli are not short, but rather elongate. Claws 

 black, pulvilli yellow-fuscous. 



Van der AVulp's figures of male wing (Biol. Centr.-Am., 

 Dipt. ii. pi. iv. figs. 11, 11 a) show the third vein altogether 

 too strongly arcuate in 11 a, hardly enough so in 11, and, 

 especially in the latter, with a too much narrowed apical 

 cell, to agree with my specimen. 



Although the vibrissse are so distinct and the bristles all 

 Ann. ds Mag. xV. Hist. Ser. 6. Vol, xix. 3 



