64 Dr. H. Schaum's Notes on Aphides. 



enormous. Kirby and Spence state that they are in England 

 amongst the greatest enemies of vegetation. Tlieir augmentation 

 is favoured by warm weather, sultry air, &c. Means of destruc- 

 tion are hardly applicable. The advice given is to strew powdery 

 substances on low herbs, and this proves generally to be effica- 

 cious ; gypsum, powder of lime, salt, &c. The larvae of Com- 

 nelUdce, Hemerohii, and some Syrphi, are their enemies, and these 

 are to be spared. 



A fen additional Observations from an Article by Kaltenbach, in 

 the Entomol. Zeitung of Stettin, 1844. 



1. Several genera have no apterous females besides the female 

 parent, but only winged females and nymphae. 



2. In some years no winged females appear of some species, 

 which, however, are observed in a more favourable year. For 

 instance, Kaltenbach could not see any winged females of Lachnus 

 quercus in 1844 ; it was only in 1845 that he found one. 



XX. 2\oo Decades of new Cetoniidse. By Dr. H. Schaum, 

 Secretary of the Entomological Society of Stettin. 



[Read 1st November, 1847.] 



Sp. 1. Heterorrhina (Plcesiorrhina) Swanzyana, Parry, MS. 



Supra nigra ; subiridescens, thoracis margine laterali pygi- 

 dioque rufo-testaceis, vitta elytrorum laterali flava, subtus 

 rufo-testacea, tibiis tarsisque nigris. 



Long. 8| lin. 



Habitat in Guinea. Mus. Parrii. 



Caput fere ut in PL mediana, Westw., forraatum, clypeo qua- 

 drate, parum marginato, antice recto, angulis rotundatis, 

 fronte obsolete carinata, nigrum, creberrime punctulatum. 

 Thorax a basi antrorsum angustatus, disco fere laevis, lateri- 

 bus punctulatus, niger, subiridescens, margine laterali ultra 

 medium rufo-testaceo. Scutellum nigrum, nitidum, linea 

 longitudinali obsoleta. Coleoptera oblonga, latitudine du- 

 plo longiora, postice parum angustata, sparsim subtilissime 

 punctata, sutura postice subelevata, nigra, subiridescentia, 

 vitta laterali neque humeros neque angulos posteriores at- 



