THE CANADIAN ENTOMOLOGIST. 23 



Odontomyia. 

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

 tions of the American Entomoloijical Society, 1S95, 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 binotata, Lw. 



Disc of thorax without marks 6. 



6. Spines of scutellum blunt varices, Lw. 



Spines of scutellum sharp viridis, Bell. 



7. Abdominal markings triangular, attenuated and reaching the lateral 



margins ciricta, Oliv. 



Abdominal markings triangular, not reaching the lateral 



margins dorsaiis, Fabr. 



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



posterior angles imequalis, Lw. 



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



Abdomen ^ $ similar, with basal triangular spot and transverse 



bands rufipes, Lw. 



9. Scutellum and spines yellow araiata, Lw. 



Scutellum and spines black flava, Say. 



10. Scutellum more or less yellowish, without spines 11. 



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 nigrirostris, Lw, 



