DESCRIPTION OF THE SPECIES. 219 



Observation 1. — Mr. Macquart, in the above quoted place, sup- 

 poses that his Tephritis fasciventris may be only a variety of the 

 Tephritis major, Dipt. Exot. Suppl. II, p. 93, Tab. VI, f. 6. 

 However, this Tephritis major is identical with Tephritis socialis 

 Wied., a species which is very distinct from fasciventris Macq. 

 (syn. eximia Wied.). 



Observation 2. — I have gone into more detail about the 

 plastic characters of this species than was strictly necessary for 

 its specific identification. I did so on account of the great resem- 

 blance in the plastic characters of T. eximia with T. amabilis, 

 with T. socialis Wied., and with several other South American 

 species. These species form a very well-defined group, for which 

 I choose the name of Hexachseta, and which deserves to be con- 

 sidered as a separate genus. The generic character may be 

 derived from what has been said, in the above description of 

 Trypeta eximia, concerning the shape of the head and of its 

 parts, the shape of the thorax and of the scutellum, the number 

 and position of their inacrochaBtse, the bristles on the feet, as well 

 as concerning the bristles on the wing-veins. The body and the 

 picture of the wings of all the species of Hexachseta are strik- 

 ingly uniform. I know of no other but American species of this 

 group. 



2. T. amabilis n. sp. % . — Lutea, thoracis dorsum sulphureo-vitta- 

 tum, postice nigricans ; pleurae fusco-nigrae, sulfureo-vittatae ; scutellum 

 magnum, planum, setis sex validis instructum, nigrum, late sulfureo- 

 marginatum ; abdomen fasciis tribus interruptis nigris ornatum ; femora 

 intermedia magna ex parte, postica fere tota nigra ; alarum pictura fusco- 

 nigra, praster maculam ingentem, quae in media ala locum habet et totam 

 ejus latitudinem explet, fasciam angustam subperpendicularem, qua 

 vena transversalis posterior includitur, et vittam costalem inde ab bac 

 fascia usque ad summam alae apicem pertinentem ostendit. 



Clay-yellowish, thoracic dorsum with sulphur-yellow longitudinal stripes, 

 blackish along the posterior margin ; pleurae brownish-black with sul- 

 phur-yellow longitudinal stripes ; scutellum large, flat, with six macro- 

 chaetae, black, with a broad yellow border ; abdomen with three inter- 

 rupted black crossbands ; intermediate femora partly, hind femora 

 almost entirely brownish-black ; the brownish-black picture of the 

 wings shows, besides an unusually large spot upon the middle of the 

 wing, occupying its whole breadth, a narrow, almost perpendicular 

 crossband, covering the posterior crossvein, and from which a border 

 extends along the costa as far as the apex of the wings. Long. corp. 

 0.26 ; long. al. 0.26. 



