Notes on the Genus Erythemis 7 



as wide or wider than the other lobes, sHghtly or scarcely indentate in the' 

 middle posteriorly, the posterior and lateral margins with long hairs. Thdrax '■ 

 moderately robust. Abdomen variable, stout to slender, inflated or not at the' 

 base, never distinctly dilated apically, segments 2 and 3, but not 4, each with 

 a distinct median transverse carina. Legs stout, third femur of the male' 

 with an antero-ventral row of 15-30 small, regular teeth, and a postero-ven- 

 tral row of similar but less numerous teeth, which rows reach from the base 

 to about two-thirds the length of the femur, the apical third with three 

 stout equal spines in the antero-ventral row and two of the same size in 

 the postero-ventral row ; second femur similarly formed with the basal 

 rows of teeth shorter, reaching only about half the length of the femur, 

 the number of teeth reduced and the apical spines variable in number, three 

 or four in each row; third femur of female similar to second femur of 

 male, ten or fewer teeth in the basal rows which reach from the base < 

 to, or not as far as, the middle of the femur, each row followed by 3 or 4 

 spines of unequal size ; second femur of female similar to the third, but the 

 apical spines reduced in number; spines on third tibia in both sexes stout, 

 about 8 in each row, slightly weaker and less numerous on the other tibiae;) 

 claws of tarsi toothed before the tip. Accessory genitalia of male small, 

 hamule two-branched. Abdominal appendages of male simple, superiors: 

 slightly constricted postbasally, then enlarging to beyond mid-length and then 

 more rapidly reduced to a superior acute apex, a ventral row of small black 

 teeth; inferior appendage triangular, shorter than the superiors, apex blunt 

 or truncate, not deeply emarginate. Lateral margins of segments 8 of female 

 not expanded. Vulvar lamina a more or less erect plate or trough. Wings 

 long, moderately broad, the triangles at about the same level in front and 

 hind wings, triangle of front wing narrow, the anterior side much shorter 

 than the proximal, once crossed, triangle of hind wing and supertriangle of 

 both wings free, subtriangle of front wing three-celled, sectors of arculus 

 joined in a long stalk, arculus between first and second antenodal, base of 

 triangle of hind wing at the arculus, 11-15 antenodals in the front wing, the. 

 last not continuous, one bridge cross-vein, one cubito-anal cross-vein in each 

 wing, normally two cross-veins under the stigma, space between the last post- 

 nodal and stigma normal, not distinctly longer than adjacent spaces between 

 postnodals, basal and apical parts of stigma about the same color, not dis- ' 

 tinctly bicolored, Cu^ and Cu. in hind wing separate at origin, Rs and Rspl 

 separated by one row of cells, Mg with a single slight curve, not distinctly 

 waved, Cu^ in front wing strongly curved, the area between it and M^ near 

 their terminations in the wing margin wide, in front wing two (rarely three 

 for one row's length ) rows of cells between A and the hind margin of wing 

 at level of arculus, anal field of hind wing broad, usually three (sometimes 

 four and always two in crcdula) rows of cells between A3 (Ao of Laidlaw) 

 and hind margin at level of base of triangle, two postanal cells in front wing, 

 Ao (Cuspl of Laidlaw) in hind wing slightly angled, the angle at about the 

 level of distal angle of triangle, less rather than more distal, in hind wing 

 three to five cells between Cu^ and Cu. from triangle to distal angle of anal 

 loop, one cell only between posterior angle of triangle and A. (Cuspl of 



