KELLICOTT. 53 



10; vulvar lamina covering one-fourth of 9, black, 

 apex excavated, angles sharp. 



OPHIOGOMPHUS, Selys. 



There are several closely related forms of this 

 group of elegant species. One only has been captured 

 within our limits. It occurs in early summer about 

 swift water of larger streams, usually flying with and 

 in a similar manner to Gomphus fraternus and G. ex- 

 ternus in parts where these occur. 



Ophiogotnphus rupinsulensis, Walsh. 



Length : of abdomen d 40, ? 38 ; of hind wing cf 

 30, 9 32 mm. 



Bright yellowish green and pale brown. Face and 

 occiput green, the latter slightly sinuous each side, 

 cilia long and black, vertex blackish, vesicle straight, 

 slighth'- swollen at the ends, antennas black; thorax 

 with a narrow pale antehumeral not reaching the 

 shoulder, humeral complete and similar in width and 

 color, sides uniformaly yellowish-green, also the legs 

 except the knees, inner surface of tibiie and tarsi which 

 are blackish; wings hyaline, costa green, veins black, 

 pterostigma brown, covering four or five cells. Ab- 

 domen slender, 8-9 strongly dilated; brown with 

 elongated yellow spots on dorsum of 1—10, conspicuous 

 on 2 and 10, ears on 2 yellow, large yellow spots on 

 sides of 7-9. 



Abdominal appendages 3'ellow ; superiors longer 

 than 10, stout hairy, obtuse, somewhat divaricate 

 curving towards the mid-line, under surface with black 

 tubercles; inferior not so wide, a little shorter, obliquely 

 truncated ; in profile strongly excavated before the 

 apex, a stout process directed upward at outer angle 

 of the truncation. 



Female similar in color, but differing as follows: 

 vertex lighter, humerals fainter and the dorsal spots 



