PSILOPUS. 241 



description is found in the Diptercs exotiqites II, 2, 122, only in the 

 latter it is said "jambes POSTEKIEUKES <t intermediaires jaitndtres," in- 

 stead of "jambes AKTERIEUKES et intermediaires jaundtres." That this 

 is merely a misprint, is ^evident from what Mr. Macquart says in 

 Dipt. exot. II, 2, 123, at the top of the page. All the characters 

 stated by Mr. Macquart are also those of P. longicornis Fabr., so 

 that Macquart's species cannot be distinguished from it. 



14. portoricensis Macq. A very incomplete description of a female first 



given in the " Suites & Buff on" and then repeated in the Dipteres 

 exotiques, II, 2, 121. Mr. Macquart again mentions this species in 

 Dipt. exot. Suppl. I, 120, and furnishes there a figure of the wing 

 (tab. xi, fig. 17). The only character contained in the description 

 and which may lead at once to the recognition of this species, is the 

 pubescence at the basis of the arista ; another character of this kind 

 may perhaps be found in Macquart's figure of the wing, where the 

 anterior branch of the fourth longitudinal vein is closely approxi- 

 mated to the margin of the wing. I know of no species possessing 

 these characters. 



15. sipho Macq. I have already remarked that the species, which Mr. 



Macquart has described under this name, is quite different from the 

 genuine sipho Say, and probably identical with P. jucundus, with 

 which it will have to be united as a synonym. 



16. incisuralis Macq. The description (Dipt. exot. Suppl. I, 120) has 



been drawn from a female ; in an observation, however, Mr. Mac- 

 quart declares that he possesses a male belonging to this female; 

 the characters, however, which he furnishes render it very doubtful 

 that they belong together. I therefore take into account the de- 

 scription of the female only. It belongs to the group of species 

 which resemble by the picture of their wings P. diffusus, superln 

 &c., but does not seem to be identical with any of these species ; it 

 has also some resemblance with a female in my collection, from 

 Brazil, which Wiedemann himself had determined as P. guttula, 

 but which, nevertheless, does not belong to this species ; however 

 the band on the wing is much broader and connected with the spot 

 near the tip of the wing not only at the anterior margin, as it is in 

 the other species, but also upon the fourth longitudinal vein. 

 Therefore incisuralis seems to be an unknown, but independent 

 species. 



17. delicatus Walk. A female, evidently belonging to the species 4 with 



pale cilia of the tegulae. None of the species, known to me, com- 

 bines pale-colored two first joints of the antenna with a green-colored 

 abdomen, except P.Jilipes Lw. ; this species, however, has a whitish 

 and therefore very striking pubescence of the abdomen. Hence 

 delicatus Walk, is not among the species known to me. 



18. gemmifer Walk. The specimen described is a male. In the descrip- 



tion no difference can be discovered between it and sipho Say, so 

 16 



