PHILIP P. CALVERT 329 



Front wings with one row of cells in the anal space (postcostal cells) from 

 base to level of the discoidal triangle 91.67 %, with two rows (two wings) 

 1.39 %, with some double cells but not forming two rows (ten wings) 6.94 

 %; with two rows of cells between Cu2 (second or lower sector of the triangle) 

 and the hind margin 86.81 %, with three or more rows (nineteen wings) 

 13.19 %. 



Arculus of the hind wings distal to the second antenodal, at least of the sub- 

 costal series, 98.61 %; at or proximal to the second antenodal, etc., (two 

 wings) 1.39 %. 



Distal thickened costal antenodal on the front wings the sixth or more 

 remote 96.53 %, the fifth (five wings) 3.47 %; on the hind wings the sixth 

 or more remote 94.45 %, the fifth (eight wings) 5.55 %. 



Cubito-anal cross-veins, including the anal crossing, (submedian cross- 

 veins) on the hind wings two or more 97.22 %, one only (four wingsj 2.78 %. 



Posttriangular rows distad to as far as the level of separation of Ml-|-2 

 and the bridge of Rs (principal and subnodal sectors) on the front wings two 

 95.14 %^\ one (seven wings) 4.86 %; on the hind wings two 99.31 %,i5 one 

 .69 %. 



Inferior angle of the ocellar triangle about 90° 95.83 % (or less?), about 

 100°-105° 4.17 % (or more?). 



De Selys first called attention^^ to the difference in the arma- 

 ture of the femora of the two sexes of Epigomphus: "les femurs 

 des males ne sont pas epineux, mais simplement denticules. 

 Chez les femelles les epines sont nombreuses et courtes." The 

 difference is more marked between the third femora of the two 

 sexes, as first and second femora of the female approach those of 

 the male. 



In 1903'" the difference in the third til)iae of the two sexes was 

 first pubhshed. 



In the present paper the further difference in the first and sec- 

 ond joints of the third tarsi is pointed out and figured. It is 

 curious that it has required forty-seven years to detect these 

 three secondary sexual characters of this pair of legs. 



"Of the one-hundred and thirty-seven wings making up this item, finir (= 

 2.78 % of the total) have a single cell reacliing aross the wliole width of this 

 area. 



'50f the one-hundred and forty-three wings making up lliis item, two ( = 

 1.39 % of the total) have a single cell reaching across the wiiole width of this 

 area. 



i«Bull. Acad. Roy. Belg. (2) xxxv, p. 755, or Troisiemcs Adcht. Syn. Gomph. 



p. 27. 1873. 



I'Entom. News xiv, p. 187. 



TRANS. AM. ENT. SOC, XLVI. 



