16 THE CANADIAN ENTOMOLOGIST. 



Non-metallic species Ptecticus, Lw.* 



More or less metallic species. 



Eyes contiguous or subcontiguous, $ ; ocelli equidistant 

 Abdomen long, pedicellate, cylindrical at the 



base Macrosargus, Bigot, 



Abdomen short, broad and 



flattened Spp. e/egans, Lw. , and Texafia, sp. n. 



Eyes, ^ 9 ) separated ; front ocellus further from the other 



two Sargus, s. str. 



The assignment of the species in the following table is based almost 

 entirely on their descriptions, and hence can not be relied upon with 

 absolute certainty. Many species are known from one sex alone, many 

 are poorly described, and as we know that there is great variability in 

 colour in some of the species, it seems certain that the species are less 

 numerous than their descriptions. All the species that have been recorded 

 as from North America are included in the table. To the future student 

 who has a sufficiently large collection is left the task of solving the 

 synonymy. 



Abdomen petiolate ; eyes of male contiguous or nearly so ; ocelli equidis- 

 tant (Macrosargus, Bigot) 2. 



Abdomen not clavate ; eyes generally separated and front ocellus gener- 

 ally further from the others 11. 



2. Thorax reddish, more or less metallic posteriorly 3, 



Thorax completely metallic green 4. 



3. Abdomen dark green ; antennte black linearis, Loew. 



Abdomen reddish, with four black fascise smaragdi/erotis, Bigot. 



4. Abdomen entirely metallic, cupreous 5- 



Abdomen with the second segment yellow coarctdtus, Macquart. 



5. Scutellum margined with red; face more or less black pilose (fili/ormis, 



Gilio Tos) Celsius, Bellardi. 



Scutellum wholly green or gold-green 6. 



6. Wings blackish ciavatus, Walker. 



Wings at most brown 7- 



7. Abdomen black with bronze lustre clavis, Williston. 



Abdomen cupreous with green lustre .8. 



Abdomen golden at base, aeneous at tip aureus, Bellardi. 



*{0f the species in Oaten Sacken's Catalogue, Sargus trivittaius, Say, and S, 

 subintertuptus, Bellardi, belong here.) 



