THE CANADIAN ENTOMOLOGIST. 23 



Odontomyia. 

 The puzzling key to the species of Odontomyia, given in the Transac- 

 tions of the American Entomolo^^ical Society, 1895, pp. 250-251, was 

 printed without Mr. Johnson's supervision, and contains numerous mis- 

 takes in typography. The student attempting to use the key is misled to 

 a blind ending in four places. The dichotomy is given corrected here- 

 with. In addition to the species listed by Mr. Johnson, the Supplement 

 of the Biologia Centrali-Americana contains three recent species from 

 Mexico. 



Third longitudinal vein branched 2. 



Third longitudinal vein simple 13. 



2. Abdomen largely green or yellow 3. 



Abdomen largely black, the markings comparatively narrow 10. 



3. Sides of dorsulum of thorax yellow or green 4. 



Dorsum of thorax wholly black 8. 



4. Abdominal markings ^ ? dissimilar ; markings of $ confluent 



laterally 5- 



Abdominal markings $ 9 similar, separated 7. 



5. Disc of thorax usually with two irregular marks bittotata, Lw, 



Disc of thorax without marks 6. 



6. Spines of scutellum blunt varipes, Lw. 



Spines of scutellum sharp viridis, Bell. 



7. Abdominal markings triangular, attenuated and reaching the lateral 



margins cincta, Oliv. 



Abdominal markings triangular, not reaching the lateral 



margins dorsalis, Fabr. 



8. Abdomen ^ with transverse bands ; $ with only lateral markings at 



posterior angles inceqtialis, Lw. 



Abdomen $ with transverse bands ; male with dorsal line 9. 



Abdomen ^j ? similar, with basal triangular spot and transverse 



bands rujipes, Lw. 



9. Scutellum and spines yellow arcuata, Lw. 



Scutellum and spines black flava. Say. 



10. Scutellum more or less yellowish, without spines i j. 



Scutellum black, with spines 12. 



11. Scutellum wholly black; black of the vertex does not extend over the 



vertical angle .fallax, Johns. 



Scutellum, base black ; black of the vertex extends over the vertical 

 angle : proboscis longer nignrostris, Lw. 



