THE CANADIAN ENTOMOLOGIST. 207 



Antennae and palpi black ; femora and tibiae not black at 



tip canariensis Bergr.^ 



4. Thoracic dorsum with two dark stripes bivittata Becker.^ 



Thoracic dorsum with more than two dark stripes 5. 



5. Costal margin of wings with six large equidistant brown 



spots . . • • caloptera Mik.* 



Costal margin of wings with four spots 6. 



6. General colour yellowish brown ; proboscis unicolorous. .imicolorY^.zM' 

 General colour light yellow ; proboscis light yellow, with a dark sub- 

 apical band hezzii, sp, n. 



This key is based entirely on the published description of the species 

 hitherto proposed. Some of these descriptions are very insufficient, for 

 example, those of athmtica Wollaston and tinicolor Haliday. One, 

 maculipe7inis Curtis,^ is so brief and unsatisfactory that we have not 

 attempted to include it in the above key. The complete description reads 

 as follows : "Rather larger than G. unicolor, and is of a lurid ochre, the 

 wings tinged with the same colour. It may be merely a variety, differing 

 principally in colour, arising possibly from age. 



Whether or not Aporosa Macq. (1838), in which Enderlein has placed 

 maculipefinis Macq. { = canariensis Berg.) and vidua Macq., is distinct 

 from Geranomyia is uncertain. The character of a radial cross-vein 

 should be sufficient to distinguish this group of species from the typical 

 Gerajiomyia group. Enderlein^ states that vidua has but one marginal 

 cell; however, Macquart (Diptères Exotiques, V, i, pt. i, p. 70), states 

 clearly that there are two marginal cells. It is doubtful whether vidua 

 is a Geranomyia ; the statement of "rostre un peu alongé" being quite 

 insufficient to give it a position in the genus Geranomyia. 



Acknowledgements are made to Mr. Frederick Knab for his kindness 

 in supplying a reference not otherwise obtainable. 



The drawing of the wing was made by means of the projection 

 microscope in the Entomological Laboratory. 



2. Macquart — Diptères Exotiques, Vol. I, pt. I, p.63 {as Aporosa maadtpennisj 

 (1838) ; changeai to caiiariensis by Berg-rolh, Wiener Entomol. Z.itung-, Vol. 8, 

 p. 118 (1889). 



3. Becker— Berlin Mitt. Zool. Mus., Vol. 4, p. 187 (1908). 



4. Mik— Verhandlungen Zool. -Bet. Gesellschaft Wien., Vol. 14, p. 791 

 (1864), as mact(lipe?i7iis^ n. sp. ; chang-ed to caloptera Mik, Verh. Zjol.-Bot. 

 Gesellschaft Wien., Vo'. 17, p 423 (1867). 



5. Halidiy — Entomological Magazine, Vol. i, p. 155(1833); Curtis, Brit. 

 Entomol,, Vol. i?, p. 573 (excellen coloured figure); Macquait, Suit, à Buffon, 

 Vol. 2, p. 652 (1835). 



6. Curtis — Brit. Entomol., Vol. 12, p. 573 {1835). 



7. Enderlein, G. — Zoologische Jahrbiicher, Vol. 32. pait i,p. 79, 80(1912). 



