182 Mr. H. Scott on 



imagines was, however, in vain. For this reason the larvae 

 and pnpse were never critically examined till 1914, when 

 I received from Mr. Urich two ? imagines which he had 

 collected in another locality, some miles from the one which 

 I visited in his company. Tiiese two imagines were studied 

 hy Mr. C. G. Lamb, who found them to bek)ng to the genus 

 Paltostoina, and who suggested to me that I should investi- 

 gate the larvse and pupse, with a view to discovering whether 

 or not they belong to the same species or genus as the 

 imagines. 



I have succeeded in dissecting a ^ fly, well advanced in 

 development, out of one of the pupai collected in 1912, and 

 find that it also belongs to the genus Paltostoma. On com- 

 paring it with one of the four S S ^ found in St. Vincent, 

 which Williston [op. cit.) described as Paltostoma schineri, 

 I have no hesitation in referring it to that species, the 

 genitalia and other structural characters agreeing exactly. 

 The identity of the pupae is thus settled, and it is also beyond 

 any reasonable doubt that the two ? imagines obtained by 

 Urich are the ? sex of the same species, since they closely 

 agree wdth Williston's co-types in all points excepting those 

 subject to sexual difference. They are therefore described 

 by Lamb in Section VI. of this paper (p. 195) as the ? of 

 Paltostoma scJiineri, hitherto known only in the (J sex. 



Moreover, the early stages of Paltostoma schineri are 

 hitherto undescribed, and, so far as tlie writer can discover, 

 no description has been published of the larva or pupa of 

 any of its congeners f. As stated above, there is positive 

 proof that the pupae collected in 1912 belong to P. schineri, 

 and there is the strongest presumption for supposing that 

 the larvae also belong to that species, since they are all of 

 one kind, and they and the pupae were all taken within an 

 area of a few square feet. I have .examined every larva 

 singly, hoping to find in one or more specimens some trace 

 of the pupal integument forming under the last larval skin, 

 and thus to gain visual proof of their belonging to the same 

 species as the pupae. This has been denied me ; nevertheless, 



* This specimen was kindly lent from the British Museum by Mr. F. 

 W. Edwards. 



t Unless, possibly, part of the larval material described by F. Midler 

 {np. cit.) belonged to the genus Paltostoma. Miiller is known to have 

 had more than one species before him, witness his PL 4. tigs. 2 & 3, 

 which show two very ditierent kinds of larvae. The imagines of one of 

 his species were referred by Brauer to the genus Paltostoma, but it was 

 subsequently shown that none of Miiller's iaiar/inal forms bek>nged to tliat 

 genus (see Osten-Saeken, oj). cit. p. 167), though it is not impossible 

 that some of his larccc may have belonge:! to it. 



