tHE ENTOMOLOGlSt. 24^ 



From this time they scarcely took any more food, and 

 descended to the ground; shortly after they spun up, some 

 just below the surface and some above, among leaves. The 

 cocoons were of two different sorts (figs. 8 and 9), — one of a 

 chestnut-brown colour and very shining, as though varnished ; 

 the other straw-coloured, and less shining. With regard to 

 this difference among the cocoons I simply attribute it to the 

 greater or less vigour and healthy condition of the larvae, the 

 strongest larvae producing the darkest-coloured cocoons. 



Dahlbom mentions in his 'Conspectus' a Nemalus Gros- 

 sularite (the same as our N. ventricosus) and a Nemalus 

 grossulariatus ; the latter was ideutical with his Grossulariae, 

 but constructed a single yellow cocoon on a twig, and not, 

 as the other, a double cocoon of a black or brown colour in, 

 or just on the surface of, tlie ground. It is evident that 

 Grossulariatus was only a sickly example of Grossulariae. 



The cocoons spun by my larvae were all single; both the 

 brown and the yellow. One would have thought that larvae 

 which had become pupae at the end of May would have 

 produced imagos by June, and a second generation in July 

 and August; however, this was not the case; and I found 

 afterwards that the larvae which I had got to spin up 

 belonged to the second generation of that year. I never 

 succeeded in rearing the perfect insect, except in March, 

 1871, from larvae which had spun up at the end of May, 

 1870; and the imagos of that month paired and laid eggs, 

 whence larvae Were produced, which would again have been 

 full grown in May. From this it appears that the species in 

 question has two early broods, and no summer or autumn 

 brood. Between the 18th and the 22nd of March I obtained 

 ten females and one male. They «// differed from Ventricosus 

 in the coloration of thorax, abdomen, and coxae. The 

 following is a description of the female, taken from a 

 living specimen (see figs. 10 and 11): — Head dark brown, 

 approaching black; the margins of the eyes, however, being 

 yellowish. Eyes black. Trophi sordid white, with the 

 exception of the tips of the mandibles, which are black. 

 Antennae entirely black. Dorsum of the thorax black, 

 with a brown reflection ; the pronotum, however, being 

 yellow. Pectus black ; only on the pleurae, which are very 

 shining, is an oval space of a red-brown colour, gradually 



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