164 NETJROPTERA OF NORTH AMERICA. 



4. D. mendaz! 



Dytliemis mendax Hagen ! 



Blackish-fuscous ; inoutb and front pale yellow; thorax fuscous, 

 dorsum each side with a fascia, which is broader at the wings, an- 

 gulose, greenish-white ; sides greenish-white, with two oblique, 

 approximate, fuscous stripes ; feet black ; the anterior femora pale 

 beneath, abdomen slender, a little longer than the wings, the base 

 compressed, more inflated, the apex stouter ; brownish-black, seg- 

 ments 1 — t with a double spot each side upon the dorsum, green- 

 ish-white, upon segments 4 — 6 it is almost linear, upon segment T 

 posteriorly, a large dilated spot, the sides and venter spotted with 

 greenish-white ; appendages black ; wings hyaline, the posterior 

 ones fulvous at the extreme base ; pterostigma small, black ; raem- 

 branule black ; twelve antecubitals ; eight postcubitals ; two dis- 

 coidal areolets. 



Length 55 — 60 millim. Alar expanse 76 — 86 millim. Ptero- 

 stigma 3 to 3^ millim. 



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



I saw a female from Tampico (Saussure) which had the head 

 chalybeous above : is it different ? 



5. D. praecoz! 



Dytliemis praecox Hagen ! 



Fuscous; mouth pale, the front fusco-aeneous above; dorsum 

 of the thorax fuscous, a green stripe each side, which is broader 

 at the wings, angulose ; the sides fuscous, three stripes, the middle 

 one interrupted, green ; feet black, the femora luteous in part ; 

 abdomen slender, a little longer than the wings, the base com- 

 pressed, more inflated, the apex thicker; fuscous, dorsum each 

 side upon segments 1 — 1, with a double, yellowish spot; upon 

 segments 4 — 6 the spots almost linear ; upon segment seven a 

 larger, broader spot posteriorly ; appendages black ; wings fusco- 

 fumose, fulvous at base; pterostigma small, black; membranule 

 black. Female. 



Twelve antecubitals; seven postcubitals; two discoidal areolets. 



Length 48 millim. Alar expanse 10 millim. Pterostigma 2^ 

 millim. 



Hab. Mexico (Collection of Hagen). 



