200 Mr. U. Scolt on 



Affinities of Imago. — The writer has no special knowledge 

 of tlie imago flies, and will only remark very briefly under 

 this liead. Paltostoma and Kellogginaoxe considered closely 

 allied : Bezzi, referring [op. cit. 1913, p. 65) to the shortness 

 of the proboscis in the ? of Paltostoma, states that this 

 renders the distinction of the two genera very uncertain. 

 But in the S sex surely the form of the mouth-parts, even 

 of the palpi alone, would distinguish the genus Paltostoma ? 

 The palpi being, as shown above, very short and at most 

 2-jointed in Paltostoma c?, while they are long and 4-jointed 

 in Kelloggina ^. Osten-Sachen {up. cit. p. 167) remarked 

 that Kelloggina ( = Snoivia) appeared to be closely allied to 

 Paltostoma, but that it had a shorter proboscis and fully- 

 developed palpi. 



VIII. Summary. 



1. Paltostoma schineri was described from the ^ sex 

 only, from St. Vincent. ? $ , larvse, and pupae have now 

 been found in Trinidad, and are described here for the first 

 time. 



2. The larva has short 2-jointed antenuse ; dorsal surface 

 spinose ; branchial filaments arranged in tufts ; lateral pro- 

 cesses simple, pediform, ciliate, without long setae ; sixth 

 segment with only one pair of lateral processes. 



3. In the full-grown larva there are ten branchial fila- 

 ments, arising in five pairs, in each tuft. In the half -grown 

 larva the number is much less. A similar increase during 

 growth has been observed in Liponeura. 



4. The larvae and pupae described as those of the South- 

 African Kelloggina barnardi do actually belong to that 

 species, in spite of doubts expressed on this point. The 

 larvae of Kelloggina and Paltostoma have a number of points 

 of resemblance, and both dift'er from Cwupira in the 

 arrangement of the branchial filaments. But in the posses- 

 sion of dorsal spines Paltostoma approaches Curupira. 



5. The pupa of Paltostoma schineri is characterized by the 

 large number of erect spiniform hairs on its dorsal sui'face. 



6. The mouth-parts of (^ Paltostoma conform to the 

 general Blepharocerid type, but are characterized by extreme 

 length and slenderness of labrum, hypopharynx, and labium, 

 and by extreme reduction of the palpi, which are minute 

 and at most 2-jointed. The ? has a much shorter, stouter 

 proboscis, and palpi normally developed. 



