MESOTHEMIS. 171 



2. M. collocata! 



Alesothemis collocata Hagen ! 



Yellowish-green; ruouth and front yellowish, a narrow black 

 band before the eyes; thorax yellowish-green, dorsum with a black 

 spot each side, the sides with three oblique lines, the middle one 

 interrupted, a spot behind, and some streaks at the feet, black; 

 feet black, anterior femora yellowish beneath ; abdomen compressed 

 at base, vesiculose, triquetral, the apex almost equal, yellowish- 

 green, the sutures and margins all banded with black; appendages 

 black ; wings hyaline ; pterostigma oblong, yellow ; menabranule 

 black. Teneral male. 



11 12 antecubitals ; nine postcubitals ; three discoidal areo- 

 lets. 



Length 43 millim. Alar expanse 61 millim. Pterostigma 3 

 millim. 



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



3. M. corrupta ! 



Mesothemis corrupta Hagen ! 



Luteous; mouth, front and vertex yellowish; head robust; tho- 

 rax luteo-fuscous, clothed with white hairs; dorsum with a white 

 stripe each side ; sides each with two oblique white stripes, and at 

 the feet a sulphureous spot, which is bounded inferiorly with fus- 

 cous; feet black, yellow above, tarsi black; abdomen stoutish, the 

 base a little more robust, luteous (with the teneral ones, whitish- 

 yellow) ; each side an arcuated fuscous stripe, dorsum with an 

 interrupted stripe, two points upon the apical segments, and a 

 larger spot upon the middle of segments 8 and 9, fuscous ; an 

 interrupted, whitish, ventral stripe ; appendages yellow ; vulvar 

 lamina flat, the apex emarginated; wings hyaline, with yellow 

 veins; pterostigma oblong^, yellow, fuscous in the middle; mem- 

 branule white ; seven antecubitals ; 6 7 postcubitals ; three dis- 

 coidal areolets. 



Length 37 43 millim. Alar expanse 58 64 millim. Ptero- 

 stigma 3 millim. 



Hal. Pecos River, Western Texas (Capt. Pope); Illinois (Ken- 

 nicott) ; Matamoras, Mexico ; Ajan, Sea of Ochotsk. 



The adult male from Matamoras is obscurer, the pterostigmata 

 are uni-colored, luteo-fuscous. 



