62 ■ Ohio Naturalist. [Vol. 1, No. 4 



The abdominal appendages of the male are different. From 

 dorsal view those of furcifer are rectangular witli tlie inner distal 

 angle very much produced inward and backward; in viUosipes they 

 are wide at base, oblong, with the outer distal part broadly rounded 

 and the corresponding inner part produced directly backward. The 

 hamules are characteristic and may be explained best by reference 

 to the figures. 



The two species are colored mucli alike but furcifer is darker- 

 The tenth abdominal segment may be said to be yellow in both 

 but in furcifer the sides of the segment are dark, oftentimes black. 



They agree in habits, both preferring to fly over stagnant water 

 where the males come to rest on floating objects or on the ground at 

 the water's edge. I iiave observed the female of furcifer ovipositing 

 in stagnant water among lily pads and otlier aquatic plants. Her 

 flight is slow while tlius engaged, and her actions more like a Libel- 

 lula tlian the usual Gomphus. 



EXPLANATION OF PLATE. 



Gomphus villosipes— 1, dorsal view of male appendages ; 3, vul- 

 var scale; 5 hamule; 7, occiput of female; 8, occiput of male. 



Gomi)hus furcifer — 2, dorsal view of male appendages ; 4 hamule ; 

 6, vulvar scale; 9, occiput of male; 10, occiput of female. 



Gomphus viridifrons— 11, 12, 13, dorsal view of male appendages 

 —13 from Pa., 11, 12 from Ohio; 14, 15, 16, hamules; 17,18, vulvar 



scales -18 from Pennsylvania, 17 from Ohio. 



Gomphus brevis — 19, 20, 21, dorsal view of male apiDendages — 

 specimens from Maine and Pennsylvania; 22, 23, 24, hamules; 25, 26,. 

 vulvar scales. 



Gomphus abbreviatus — 27, 28, 29, hamules; 30, 31, vulvar scales;. 

 32, 38, 34, dorsal view of male appendagages — specimens all fronx 

 Maine. 



