The Zoologist — March, 1868. 1119 



R. Lactucae with cylindrical nectaries, is supposed by Passerini to be 

 Siphonophora Lactucae. 



2. R. Berber idis, Kaltenbach. — It is very remote from R. Lactucae 

 in structure and in habits, and forms a new genus, which may be thus 

 briefly described: — 



Genus Liosomaphis. 



Foemina vivipara aptera. 



Corpus ellipticum, vix convexum. Frons plana. Antennae corporis 

 dimidio vix breviores. Nectaria subclavata, subascendentes, 

 corpore quintuplo breviores. Cauda neclariis plus duplo brevior. 

 Pedes graciles, breviusculi. 



The wingless viviparous female. 



Body rather flat, increasing in breadth from the head to two-thirds 

 of the length, rounded from thence to the tip of the abdomen. Head 

 flat iu front. Antenna? nearly half the length of the body. Nectaries 

 subclavate, slightly curved upward, about one-fifth of the length of the 

 body. Tail distinct, less than half the length of the nectaries. Legs 

 slender, rather short. 



3. R. Persicce, Sulzer. — This species was first noticed by Sulzer in 

 his Abgekurzte Geschichte der Insecten. Passerini has identified it 

 with Aphis Dianthi, Schrank. The reference to Aphis Persicse, 

 Kaltenbach, as a synonym of A. Persicae, Sulzer, in Ann. Nat. Hist. 

 Ser. 2. v. 72, is erroneous. Morren described and illustrated fully the 

 anatomical structure of this species, and named it A. Persicas, 

 supposing that it had not been recorded. His conclusion that it 

 migrated from another country and radiated over Belgium appears to 

 be wrong. The winged female appeared in countless millions through 

 various parts of Belgium from the 28th of September to the 15th of 

 October, in 1834. Morren remarks that the winter of 1833-34, was 

 extremely mild, and that the next summer was excessively hot and 

 dry, there being entire months without rain. These seasons were both 

 very favourable to the increase of Aphides. The first season enabled 

 them to multiply incessantly without the renovation of the egg state. 

 The next season was equally favourable for increase, as wet is very 

 destructive to Aphides: The hot weather was also the means of the 

 appearance of the winged form, so that, while it shrivelled the 

 sustenance of the Aphides, it preserved their lives by enabling them to 



