DESCRIPTION OF THE SPECIES. 319 



rior corner likewise there are several drops. The third longitu- 

 dinal vein is without bristles and the small crossvein corresponds 

 to the second third of the discal cell. 



Hab. Mexico (Berlin Museum) ; Texas (Belfrage). 



Observation. — The above description, as well as the figure, are 

 prepared after the specimen in the Berlin Museum, which is the 

 original type of Wiedemann's description. Two males, sent by 

 Mr. Belfrage from Texas, agree in all respects, with the only 

 exception that, in one of them, the basis of the abdomen is dingy 

 yellowish. I am in doubt whether T. mexicana is not the male 

 of the Cuban species, which I described as T. melanogastra, and 

 of which I possess a very imperfect soiled and faded specimen, not 

 sufficient to enable me to form an opinion. A part of the appa- 

 rent differences may be due to this condition of the specimen. 

 The description of T. melanogastra in the first volume of the 

 Monographs says that there is sometimes a clear drop immedi- 

 ately before the end of the second vein ; I must complete this 

 statement by saying that this drop exists in the two females of 

 my collection, but not in the male; whether this difference in the 

 picture of the wings is a constant, or at least an ordinary, sexual 

 distinction, I am not prepared to say. The development of the 

 rays ending in the posterior margin in the female of T. melano- 

 gastra is not even always as complete as Tab. X, f. 24 (drawn 

 after a female specimen) represents it ; and the male of my col- 

 lection approaches very much in this respect the typical male of 

 T. mexicana. The differences which fig. 24 and 28 show in the 

 development of the drops in the vicinity of the posterior margin, 

 are of not much importance for specific distinction, as the 

 reticulation in that vicinity is very variable in many species. All 

 these circumstances seem to militate very strongly in favor of 

 specific identity. The only notable difference which I can 

 perceive in the typical male of T. mexicana (in the Berlin 

 Museum) as well as in the two males from Texas in my collection, 

 when compared to my single male specimen and my two females 

 of T. melanogastra, consists in the position of the hyaline drop 

 in the submarginal cell, which in T. mexicana is placed under 

 the first of the two hyaline indentations situated in front of it, 

 while in T. melanogastra it is under the brown line which sepa- 

 rates the two indentations. This difference is not important and 

 not equally distinct in all specimens, and it is probable that the 



