APPENDIX. 203 



Body rather long and narrow. Epistoma rather prominent; 

 mouth large ; third joint of the antennae long, slender, linear, 

 extending to the epistoma ; arista slender, simple, nearly twice 

 the length of the third joint. Thorax long, compressed on each 

 side. Abdomen long, subfusiform, attenuated towards the tip. 

 Legs stout, moderately long. Wing rather narrow ; veins straight. 



Female. Abdomen attenuated at the tip. Vagina of the 

 oviduct slender, produced. 



Briciiinia flexi vitta Foem. 



Nigra, capite apud oculos albo, vitta antiea albida, antennis 

 ferrugineis basi fulvis, thorace vittis tribus albidis, pectore pur- 

 pureo-eyaneo, abdomine cupreo, femoribus posticis basi flavis, 

 tarsis fulvis, alis sub-cinereis, costa apiceque luridis, vitta discali 

 angulata nigra, vena discali transversa vix arcuata. 



Female. Black: head white about the eyes and with a whitish 

 facial stripe, which is dilated towards the epistoma ; antennae 

 ferruginous, tawny towards the base ; thorax with three whitish 

 stripes ; pectus blue, varied with purple ; abdomen cupreous ; 

 vagina of the oviduct attenuated ; hind femora yellow towards the 

 base; tarsi tawny; wings grayish, lurid along the costa and at 

 the tips, and with a blackish stripe which extends from the base to 

 and along the discal transverse vein; the latter is upright and 

 hardly curved, and is parted by four times its length from the 

 border, and by a little less than its length from the proebrachial 

 transverse vein, which is oblique. 



Length of the body 5 lines ; of the wings 10 lines. 



Mexico. 



