PHILIP A. MUNZ 43 



4 (9). Basal space crossed. Arculus usually distinctly angled and not markedly 

 oblique 5 



5 (6). Eight or more cells across the anal area along Cu-ia- More than two sectors 

 from Cu-2a run toward the anal angle, but they are irregular. Anal margin of 

 hind wing convex. Space between Cui and Cuo in hind wing reticulate just be- 

 yond MA. China. (Fig. 8.) Archineura Kirby, 1894 



6 (5). Not more than four to five cells along Cu2a between Cuo and the wing-margin. 

 In the fore wing there is one sector from Cuoa toward the anal angle; anal margin 

 not convex. One row of cells between Cui and Cu2 at their origin 7 



7 (8). Nodus less than one-half of the distance from the base of the wing to the 

 stigma. Southern and south-eastern Asia. (Fig. 7.) Echo Selys. 1853 



8 (7). Nodus more than one-half the distance from the base of the wing to the stigma. 

 Southeastern Asia. (Fig. 6.) Climacobasis" Laidlaw, 1902 



9 (4). Basal space free. Tendenc}' for arculus to be less angled and more 

 oblique 10 



10 (11). Cu-2,i in the hind wing running almost toward the margin, so that it does 

 not reach the length of the quadrangle before sending off a branch toward the 

 anal angle. Western and Central Africa. (Fig. 9.) Umma Kirb}-, 1890 



{Cleis Selys, 1853) 



11 (10). Cuja in the hind wing running toward the base of the wing, almost the 

 length of the quadrangle before sending a branch toward the anal angle. West 

 Africa. (Fig. 10) Sapho Selys, 1853 



12 (3). Sectors in that area of the hind wing posterior to Cua and distad to Cu2a, 

 usually (sometimes not in Agrion) attached directly to Cu2a. Stigma false or 

 lacking 13 



13 (14). Basal space free. Almost cosmopolitan, except for most of Africa and 

 Australia. (Fig. 11.) Agrion Fabricius, 1775 



{Calopteryx Leach, 18 15) 



14 (13). Basal space crossed 15 



15 (16). Broad area in hind wing posterior to Cuo, with five rows of cells between end 

 of Cu2a and the wing margin which is ver>' convex; in the hind wing the length is 

 less than three and one-half times the breadth. R^ very strongly waved in the 

 hind wing, cutting ofT a sector anterior to it. All four wings of the male opaque; 

 only one or two cells of the basal space divided. Borneo. (Fig. 12.) 



Matronoides Foerster, 1897 



" I am not sure that Climacobasis is generically distinct from Echo. Laidlaw (1903) 

 says of Climacobasis lugens and Echo modesta, "There can be no doubt that the two spe- 

 cies which I founded on a single specimen in each case, are merely male and female of 

 the same species. The generic name may be retained as that of a section of the genus 

 Echo, distinguished by the great relative length of the pterostigma in the male, in which 

 it is about three times as long as in the female." Williamson (1904) says, "Echo is 

 known to me only from descriptions and figures, but such differences between it and 

 Climacobasis appear to exist in the anal region and in the stigmas of the males that, in 

 so far as the two names have been published, their separation seems to me desirable, at 

 least till more critical study can be made." 



Since I have had no access to specimens of Echo, I shall here follow tiie precedent made 

 by Williamson. The stigmatic differences in figures six and seven are due to sex rather 

 than genus. 



MEM. AM. ENT. SOC, 3. 



