20 



three cells at the wing margin. Antenodal cells 14; postnodal cells 10. 

 Abdomen black or dark brown with yellow as follows: on segments 1 to 8 a 

 mid-dorsal stripe never as long as the segment, and becoming shorter and less 

 prominent posteriorly, almost disappearing on 8, and widening on 1 and 2 to a 

 blotch. Laterally blotched on segments 1 and 2, with a latero-proximal spot 

 on 3 to 7, and on 8 and 9 with the lower lateral half yellow, 10 ventrally yellow. 

 Segments 7 to 9 moderately expanded (2.5 mm.). Superior appendages dark 

 brown and black, as long as segment 10, acute apically, and bearing two ven- 

 tral teeth near apex, the anterior one more prominent. Ventrally viewed these 

 teeth are on the inturned inner margin. Inferior appendage dark brown and 

 black, villous, reaching posterior tooth of superior appendages, and with ends 

 upturned at apex. Accessory genitalia of segment 2: anterior hamule black, 

 posterior hamule yellowish, vesicle black. 



Fig. 1:— Accessory genitalia. 



Fig. 2. — Abdominal appendages, lateral view. 



Fig. 3. — Color pattern of thoracic markings. 

 Fig. 4. — Abdominal appendages, dorsal view. 



Type locality: Squam Lake, New Hampshire. 



Type: in the entomological collection of the Boston Society of Natural 

 History, Boston, Massachusetts. 



This species is evidently a near relative of Gomphus abbreviatus. 

 It makes the twenty-second species of this genus known from New 

 England of which all but two are rare. It differs materially from G. 

 cavillaris Need., G. brimleyi Mutt., G. parvidens Currie, G. viridifrons 

 Hine, and G. brevis Hag., in many respects as shown by a comparison 

 of the abdominal appendages. It is also unlike G. abditus Butler 

 described from Chicopee, Massachusetts (Can. Ent., 46 : 347-348, 

 1914). This latter was overlooked in the author's Manual of Odonata 

 of New England; it makes 166 species now known from these States. 



