PANTALA. 141 



the base of the feet, blackish fuscous ; feet black, base of the femora 

 luteous; abdomen short, stout, triquetral, the base subinflated, lu- 

 teous, the incisures and the three apical segments, black ; append- 

 ages luteous ; vulvar lamina short, subemarginate ; wings hyaline, 

 with luteous veins, the base with a fulvous spot, that of the ante- 

 rior wings small, pterostigma yellow; membranule cinereous. (Fe- 

 male.) Six antecubitals ; five postcubitals ; two discoidal areolets. 



Length 31 millim. Alar expanse 68 millim. Pterostigma 2J 

 millim. 



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



Does it belong to this genus ? 



3. T. diffinis. 



Tetragoneuria diffinis Selys' Collection. 



Hab. Nova Scotia. Unknown to me. 



4. T. costalis. 



Tetragoneuria costalis Selys' Collection. 



Hah. Georgia. Unknown to me. 



Sub-Fam. VI. LIBELLULINA. 



Eyes entire behind; beginning of the second series of postcubi- 

 tal spaces with no transverse veins. 



PANTALA Hagen. 



Eyes connected in a long space; posterior lobe of the prothorax 

 small, entire ; abdomen cylindrical, stout, the apex sensibly attenu- 

 ated, basal segments 2 — 4 with two transverse sutures ; feet long, 

 slender; base of the posterior wings triangularly dilated; ptero- 

 stigma small, trapezoidal; first sector of the triangle of the ante- 

 rior wings straight; triangles of the anterior wings narrow, long; 

 caudal appendages elongated; genital organs of the male a little 

 prominent, the anterior lamina bifid; internal branch of the hamule 

 unguiculated ; no unguiculus to the external one; vulva disclosed, 

 the margin recurved, entire ; the following segment carinated be- 

 neath, and bituberculated. 



