182 Mr. II. Scott on 



imagines -^as, liowever, in vain. For this reason the larvie 

 and pupnj were never critically examined till 1911-, when 

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

 collected in another locality, some miles from tiie one which 

 I visited in his company. These two imagines were studied 

 by Mr. C. G. Lamb, wiio found them to belong to the genus 

 Paltostoma, and who suggested to me that I shouhl investi- 

 gate the larvae and pup;e, 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 pupae collected in 1912, and 

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

 paring it with one of the four J c? * found in St. Vincent, 

 which Willistnn [op. cil.) described as Pallostoma schhieri, 

 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 tliat the two $ imagines obtained by 

 Urich are tlie 9 j^ex of the same species, since they closely 

 agree with Williston^s co-types in all points excepting those 

 subject to sexual difference. They are therefore described 

 by Lamb in St-ction VI. of this paper (p. 195) as the ? of 

 FaUostoma scliineri, hitherto known only in the J sex. 



^Moreover, the early stages of Paltostuma schineri are 

 liitherto undescribed, and, so far as the 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 piipse 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 Avere 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 pupse. 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. Miiller 

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

 had more than one species before him, witnef^s liis PI. 4. figs. 2 «& 3, 

 which show two verv different kinds of larvae. The imagines of one of 

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

 subsequently shown that none of Miiller's imarfinal forms belonged to that 

 genus (see 0.«ten-Sa(;ken, op. cit. p. 167), though it is not impossible 

 that some of his larva; mav have belonged to it. 



