386 CURRIE 



onymic Cat., p. 2, 1890. — Calvert, Trans. Am. Ent. Soc, xx, p. 

 254, 1893. — Kellicott, Bull. Ohio State Univ. (4), No. 5, p. 93, March, 

 1899. — Williamson, 24th Ann. Rep. Dept. Geol. and Natural Resources, 

 Ind., 1899, Blatchley, p. 315, 1900. 



One female, Charles Island, August 2 (No. 39). 



Distribution. — United States, Mexico, Cuba, Galapagos Islands. 



6. TRAMEA DARWINI Kirby. 



Tramea darwtni Kirby, Trans. Zool. Soc. London, xii, p. 315, PL li, fig. 

 I, August, 1889. — Kirby, Synonymic Cat., p. 3, 1890. 



Two males (Nos. 37 and 38) and one female (No. 46) ; the former 

 were collected on Chatham Island, May 23 and 27; the latter on Al- 

 bemarle Island, March 23. 



Only the female of this species was described by Kirby, and the 

 single female specimen in this collection agrees well with that descrip- 

 tion. The males were thought by me to be a different species until 

 compared with a series of seven males and four females in the U. S. 

 National Museum from Hood, Chatham, Charles and South Albemarle 

 Islands, collected by the U. S. Fish Commission. The females of 

 this series show a remarkable variation in the length of the dark-brown 

 basal spot of posterior wings. In some of them it is hardly longer 

 than wide, in others it reaches one-third of the way, one-half of the 

 way, or even farther, towards the hind margin of the wing. Unfor- 

 tunately the wings are badly torn and the hind margin, in some speci- 

 mens, is entirely absent so that it is impossible to know whether or not 

 the spot does reach this margin in any of them. In the males it reaches 

 the hind margin or to the torn hind edge of the wing. In both sexes 

 the superior surface of the frons and the anterior face of the vertex are 

 more or less extensively, sometimes entirely, metallic purplish, or 

 violet; the labrum has the black portion quite variable in extent, some- 

 times almost completely covering it, sometimes a mere margin. As 

 the two males of the Snodgrass collection are in fairly good condition, 

 it may be well to describe them here. 



TRAMEA DARWINI Kirby. 

 Male. — Similar to the female. Superior appendages about as long 

 as segments 9 4- 10 of abdomen, black, rufous at base; inferior ap- 

 pendage a little more than one-half as long as the superiors, reaching 

 a little beyond the denticulated portion. Hamule not exceeding the 

 genital lobe. Wings very slightly fumose apically; the posterior ones 

 with the basal spot extending outward as far as the median cross-vein 

 and backward to the hind margin, the anal margin hyaline, tinged with 

 rufous. 



