104 NEUROPTERA OF NORTH AMERICA. 



Length 65 — 12 millim. Alar expanse 84 millim. Pterostigma 

 3^—4 millim. 



Hah. Georgia (Abbot). 



12. G. externus! 



Gomphus externus Hag.! Monog. Gompli. 411, 37 bis; pi. xxl, fig. 2. Se- 

 lys, Addit. Synops. 14, 31 bis. 



Yellow, spotted with black ; head yellow, a narrow black band 

 before the eyes ; thorax yellow, dorsum with a straight middle 

 stripe, and two each side, incurved, black ; sides yellow, each side 

 with two oblique black stripes ; feet black, anterior femora upon 

 the base beneath, yellowish, tibice at the base exteriorly, yellow ; 

 abdomen long, the apex dilated ; yellow, each side with a broad 

 black stripe, which is conjoined upon the dorsum at the apex of 

 the segments ; appendages fuscous, superior ones short, trigonal, 

 acute ; the inferior one broader, bifurcated ; vulvar lamina narrow, 

 the apex bifid ; wings hyaline, pterostigma narrow, fuscous ; 11 — 

 12 antecubitals; 9 — 10 postcubitals; two discoidal areolets. 



Length 52 millim. Alar expanse 66 millim. Pterostigma 3 

 millim. 



Hah. Pecos River, Western Texas (Capt. Pope). 



13. G. adelphus. 



Gomphus adelphus Selysl Monog. Gomph. 413, 38 bis. Selys, Addit. Sy- 

 nops. 15, 34 ter. 



Yellow, spotted with black; head yellow, in front with two con- 

 fluent black bands ; thorax yellow, dorsum each side, with three 

 black stripes, the intermediate ones contiguous ; feet black ; apex 

 of the abdomen dilated, dorsum black, segments 1 — 7 with a macu- 

 lose, median, yellow stripe ; appendages black, superior ones 

 incurved at the apex, acute ; wings hyaline, pterostigma small, 

 fuscous. Male. (From the description of De Selys Longchamps.) 



Length 48 millim. Alar expanse 54 millim. Pterostigma 2 

 millim. 



Hah. iS'ew York (Asa Fitch). 



14. G. fraternus ! 



^schna fraterna Say, Journ. Acad. Philad. VIII, 16, 9. — Gomphus fra- 

 ternus Selys ! Monog. Gomph. 125, 138 ; pi. vii, fig. 4. Selys, Sy- 

 nops. 28, 32. 



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



