6 University of Michigan 



Archaeogomphus among them, and about 5 o'clock I gave up 

 the search and started home. Passing from the coffee planting 

 near the river, I looked back for the last time and saw, resting 

 on a dead twig tip about three feet from the ground, a small 

 dragonfly whose wings were horizontal instead of slightly 

 drooping in the almost invariable small libelluline position. I 

 retraced my steps, and as I approached I saw the separated 

 eyes of a gomphine, which, after a few literally breathless sec- 

 onds, was safely fluttering in my cyanide bottle. This speci- 

 men is the type of the species. I worked over the coffee plant- 

 ing several times in the next hour till the setting sun ended 

 the day's collecting, but not another Archaeogomphus was seen. 



The Genus Archaeogomphus and its Species 



In view of the characters shown by the new species 

 described above, the genus Archaeogomphus may now be 

 defined as follows : Small, short-legged gomphines with the 

 third femora reaching backward slightly beyond the base of 

 abdominal segment 2. Venation simple; triangles, supratri- 

 angles and subtriangles free, crossveinsi between Mi_3 and M4 

 not specialized, triangle four-sided, stigma without brace-vein, 

 basal antenodal of second series wanting, one cubito-anal 

 crossvein in addition to the inner side of the subtriangle, one 

 row of postrigonal ^cells in both front and hind wings, anal 

 area of the front wing one cell wide, two postanal cells in the 

 hind wing, cells posterior to Cu, and distal to the postanal 

 cells in the hind wing, which do not reach the posterior wing 

 margin, none to four in the male and one to six in the female, 

 anal triangle wanting in the male, but posterior margin strongly 

 angled. Male with the abdominal appendages reduced and 

 functionless as grasping organs, the dorsum of segment 10 



