GOMPIITJS. 109 



riorly, tibiae interiorly, and the tarsi, brownish-black ; abdomen 

 with the apex a little dilated, the dorsum blackish-fuscous, with a 

 medial yellow stripe; appendages yellow, superior ones trigonal, 

 dilated and toothed beneath ; the inferior one broadly bifid ; vulvar 

 lamina oval, short, bifid ; wings hyaline, pterostigma yellow ; nine 

 antecubitals ; eight postcubitals ; two discoidal areolets. 



Length 42 millim. Alar expanse 50 millim. Pterostigma 2 

 millim. 



Hob. Maryland (Uhler); Massachusetts (Scudder). 



24. G. parvulus. 



Gomphus parvulus Selys ! Monog. Gomph. 157, 53 ; pi. xxii, fig. 1. Se- 

 lys ! Synops. 37, 47. 



Black ; head black, a fascia in front, and two spots, yellow ; 

 thorax black, dorsum each side, with a small, yellow line ; sides 

 yellow, with two contiguous stripes and a third posteriorly, black ; 

 feet black ; abdomen equal, black, the dorsum with a basal, ma- 

 culose, yellow stripe ; appendages fuscous, superior ones nearly 

 straight, cylindrical, the apex narrower, acute, beneath with a 

 basal tooth ; the inferior one-half shorter, broadly bifid ; wings 

 hyaline, pterostigma blackish-fuscous. (Male.) 



Thirteen antecubitals ; eleven postcubitals ; two discoidal areo- 

 lets. 



Length 40 millim.' Alar expanse 54 millim. Pterostigma 3 

 millim. 



Hob. Nova Scotia (British Museum). 



25. G. plagiatus. 



Gomphus plagiatus Selys.! Monog. Gomph. 159, 54. Selys ! Synops. 38, 48. 



Yellow, spotted with black ; head yellow ; dorsum of the thorax 

 black, each side with a yellow stripe ; sides yellow, with two black 

 limes ; femora yellow, the basal half exteriorly black, tibiae and 

 tarsi black; abdomen long, the apex subdilated, luteous ; segments 

 7 9 yellow, with a red apex ; appendages yellow, like those of 

 G. villosipes; wings hyaline, pterostigma yellow. (From the de- 

 scription of De Selys Longchamps.) 



Fourteen antecubitals ; eight postcubitals; two discoidal areolets. 



Length 54 millim. Alar expanse 64 millim. Pterostigma ? 

 millim. 



Hob. North America (British Museum). 



