GOMPHUS. 99 



1. G. compositus ! 



Erpetogomphxis compositus Hag.! Monog. Gompli. 400, 16 bis ; pi. xx, fig. 

 2. Selys, Addit. Synops. 10, 21. 



Pale yellow ; head pale, between the eyes black ; thorax pale, 

 dorsum with two broad, approximated stripes, and another exter- 

 nal one each side, a little incurved, black ; the sides bright yellow, 

 each side with oblique, black lines ; the space between the second 

 and third line pale; feet yellow, having a black line exteriorly, the 

 tarsi black ; abdomen black, the second segment at sides, and a 

 dorsal, elongated spot, segments 3 to 7 with a large, hastiform 

 spot, the eighth each side of base, and the following ones entirely, 

 pale yellow, appendages yellow; vulvar scale short, divided; wings 

 hyaline, subflavescent at base, pterostigma large, black. Female. 

 Thirteen antecubital cross-nervules. 8 — 9 postcubital cross-nerv- 

 ules. 



Length 46 millim. Alar expanse 62 millim. Pterostigma 31 

 milliui. 



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



2. G. designatus ! 



Erpetogomplius designatus Hag.! Monog. Gomph. 401, 16 ter; pi. xx, fig. 1. 

 Selys, Addit. Synops. 10, 26 bis. 



Yellow ; head pale yellow ; thorax yellow, the dorsum with two 

 subcontiguous stripes, which are broader in front, and another 

 shorter, oblique one each side, fuscous ; the sides pale, with three 

 very narrow fuscous lines, the middle one interrupted ; feet yellow, 

 femora and tibise with an external streak, and the tarsi entirely 

 black; abdomen cylindrical, slender, the dorsum blackish-fuscous, 

 segments 2 to T with a large, dorsal, hastiform yellow spot; in the 

 females the sides are interrupted with pale ; the males have the 

 four last segments subdilated, yellow, obsoletely varied with fus- 

 cous; the superior appendages contiguous, straight, the apical half 

 narrowed, acute, the inferior one narrow, bifid, hardly shorter than 

 the superiors, the apex recurved, obtuse ; vulvar lamina with a 

 small triangle each side; wings hyaline, their extreme bases flaves- 



cent, pterostigma large, dilated, black; thirteen antecubitals ; 8 



10 postcubitals; two discoidal areolets. 



Length 49 — 51 millim. Alar expanse 66 — 68 millim. Ptero- 

 stigm.a 3 2 millim. 



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



