Vol. XXVli] ENTOMOLOGICAL NEWS. 1 71 



lem to taxonomists. De Selys in 1873, largely on the size and 

 form of the male abdominal appendages, divided the asso- 

 ciated genera into 2 major groups, the latter 'of which was di- 

 vided into 5 subgroups, one of these being in turn divided into 



2 groups and one of these subdivided on geographical grounds. 

 I believe that these groupings have litt.le basis in fact, but that 

 two groups of real taxonomic value can probably be distin- 

 guished on the basis of the number of cross-veins between Mi- 



3 and M4- In the larger number of genera the number is re- 

 duced in the front wings and in the hind wings there is nor- 

 mally only one, which is strengthened and definitely placed. 

 In the remaining genera the number of these cross-veins is 

 relatively larger (the complexity of venation must be taken 

 into account), and in the hind wing there are always two or 

 more, instead of one definitely placed cross-vein. These 

 genera known to me are Macrogomplnis, Microgomphns, Lep- 

 togoinpluis, Epigomphus, Cyanogomplins and Agriogomphus 



a group of striking and remarkable forms. Microgomphns 

 and Agriogomphus have much in common, including the un- 

 symmetrical forking of Mi-2 and M3, and the single row of 

 cells in the anal area of the front wings ; in Microgomphus 

 there are two rows of postrigonal cells, one row in Agriogom- 

 phus. The remaining genera have a basal antenodal of the 

 second series present in all wings. In only one, Cyanogom- 

 phits, has the stigma a brace vein, at:tl in this genus alone the 

 distal thickened antenodal is the fifth, being more distal in the 

 others. In Epigomphns and Macrogomphiis there are two 

 cubito-anal cross-veins in addition to the inner side of the sub- 

 triangle. 



To summarize, the genus Cyanogomphus, as a member of 

 the legion Gomphus, may be venationally defined briefly as 

 follows: Cross-veins between Mi -3 and M4 numerous; stigma 

 with a brace vein; M4 and Cui divergent; basal subcostal 

 cross-vein of second series present ; one cubito-anal cross-vein 

 in addition to the inner side of the subtriangle; anal area of 

 front wing proximally one cell wide, distally two or three 

 cells wide; three postanal cells in hind wing, distal to postanal 



