DESCRIPTION OF THE SPECIES. 267 



on the sides of the middle and of the last segments are black. 

 Ovipositor very short, about once and a half the length of the 

 last abdominal segment, very conspicuously broad, not much 

 attenuated towards the end, very broadly truncate and somewhat 

 convex; its coloring is a shining brownish-black or black; the 

 pubescence is black. In agreement with the unusual breadth of 

 the ovipositor, the last abdominal segment is also very broad, 

 which causes the whole abdomen to have a peculiar shape. The 

 second coxal joint yellowish ; posterior femora black with a clay- 

 yellow tip ; front femora clay -yellow, with a large, broad, brown- 

 ish-black stripe upon the hind side; tibiae and tarsi clay-yellowish, 

 the tip of the latter dark brown. Hind tibiae on the upper side 

 beset with rather long bristles. 



Bab. Illinois (Walsh) ; the larva, originally feeding upon the 

 fruit of a Crataegus, is now frequently found upon the fruits of 

 the apple-tree, which it damages. 



Observation. — The next relatives of T. pomonella are found in 

 a series of South American species, only a single one of which, 

 as far as I know, has been previously described ; it is to be found 

 in Macquart's Dipteres Exotiques, Suppl. IV, p. 288, Tab. 

 XXVI, f. 15, under the name of Urophora scutellaris. It is not 

 an Urophora however, and moreover, the name of scutellaris 

 cannot be maintained, as Wiedemann has previously used it for 

 another species. The species may, therefore, be called Trypeta 

 Macquartii. Macquart's figure shows, that this Brazilian species 

 differs in the picture of its wings from the species of Bhagoletis 

 previously described, and that, in this respect, it is more like the 

 species of Acidia. The structure of its body shows a corre- 

 sponding approach to the species of this latter genus, while, on 

 the other hand, coloring and picture of the body are most strik- 

 ingly like those of Bhagoletis. As this species is also very like 

 the North American Bhagoletis in the structure of its body, the 

 question arises whether it is better to place it in the genus Acidia 

 or in Bhagoletis. I prefer the latter course, because we thus 

 facilitate the generic determination of the allied species. Trypeta 

 pomonella, as has already been mentioned above, is among the 

 number of such species, the picture of its wings being very like 

 that of T. Macquartii. It is true that it differs not inconsiderably 

 from T. Macquartii in the greater length of the third antenna! 

 joint, the considerable size and breadth of the oral opening, and 



