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to pursue these interesting investigations much further. In 

 the meantime his conchisions received support from Mr. 

 Donisthorpe's account of fungus in the carton made by Lasius 

 tunhratus (Ent. Eecord, xxv (1913), p. 92, and xxvi (1914), 

 p. 39), and of the observations which were brought before 

 this Society in March of the present year. 



W. A. Lamborn's account of the larvae of two species 

 OF the Geometrid genus Aletis in the Lagos District. — 

 The following interesting observations were made at Oni 

 Camp, 70 miles east of Lagos, and were sent to Prof. Poulton 

 with the date Feb. 18, 1911. The genus Aletis, formerly 

 included in the Boarmiinae, was now provisionally placed by 

 Mr. L. B. Prout in the Oenochrominae. 



" I was much exercised in mind about these Geometer 

 moths [Aletis erici, Kirby, and A. helcita, Clerck], until, on 

 looking at your photograph of kindred species, I saw two 

 Aletis helcita among the others, and then remembered your 

 reason for putting them in, viz. that you suspected them of 

 being different species, though at present often mixed in 

 collections. I think there can be no question about it now, 

 for the larvae are so very different and there are also other 

 considerations which favour the conclusion. 



" The commoner larva [that of Aletis erici] is characterised 

 by broad transverse bands of a bluish-black colour, alternating 

 with white bands (with a trace of blue in them). The bands, 

 both dark and light, in the tiny thread-like caterpillar (as far 

 as I remember), and throughout the whole of larval existence 

 are of the same ^qual breadth. The less common larva 

 [that of A. helcita] is coloured the same as the other, but 

 when it is tiny the bluish-black bands are very much narrower 

 than the white bands. Furthermore, the early moults are 

 followed by the appearance of a bluish-black linear and then 

 diamond-shaped patch in the white band, and at each subse- 

 quent moult this patch changes its shape. The head and 

 claspers are yellowish in both species. I just mention these 

 facts hastily and without looking over specimens. 



" The caterpillars feed on very different food-plants. The 

 commoner larvae [erici] are gregarious [as shown in the follow- 

 ing reproduction of a photograph taken by Mr. Lamborn]. 



