2.)6 Dr. Schleiden on the Anatomico-pfiytiological 



aris ; 2" s basi ad apicem latcsccns ; 3 U * ct sequentcs lineares ; 4 U8 3° brevior, 

 5° longior ; clava ftuiformif, articulo '>" paullo latior et duplo longior : tho- 

 rax ovatus : prothorax transvcrsus, brcvissimus : mcsothoracis scutum uni- 

 sulcatum, fere planum, longitudine paullo latius ; parapsidum suturae re- 

 motae, optiine determinate; Bcutellum nibrotundum, biiulcatum: meta- 

 thorax transvcrsus, brevis : j)ctiolus brcvissimus : abdomen ovatum, supra 

 planum, lubtus carinatum, apice acuminatum, thorace paullo longius et la- 

 tius : pedet graciles, simplices, subaequales : alae latae ; nervus ulnaris hu- 

 meral] duplo longior, radialis nullus, cubitalis sat longus ; stigma minutum. 



Sp. 1. Cirr. Teridae, Fern. Nigro-cupreus, antennee piceee, pedes fusco- 

 fulci, femora nigro-cuprea, alee limpidee. 



Nigro-cupreus: oculi et ocelli run" : antennae piceae ; articuli l us et2 us ni- 

 gri ; pedes nigro-cuprei ; trochanteres picei ; genua flava; metatibiae apice 

 fulvae ; mesotibiae fulvae, fusco cinctae ; propedum tibiae fulvae, tarsi fusci ; 

 meso- et metatarsi fusci, basi fulvi : alae limpidee ; squamulae piceae ; nervi 

 proalis fulvi, metalis flavi. (Corp. long. lin. 1 ; alar. lin. 2-J-.) 



Found by Dr. Greville, near Edinburgh. 



Fern. C. Sotadi afiinis? corpus angustum, convexum, obscurum, scitissime 

 squameum parce hirtum : caput transversum, breve, thorace paullo latius ; 

 vertex latus; frons abrupte declivis : antennae graciles, extrorsum cras- 

 siores, thorace paullo longiores ; articulus l" s sublinearis ; 2 US longicyathi- 

 formis ; 3 US , 4"", et 5 US lineares, subaequales ; clava longifusiformis, acumi- 

 nata, articulo 5° plus duplo longior : thorax ovatus : prothorax trans versus, 

 brevis : mesothoracis scutum longitudine paullo latius ; parapsidum suturae 

 optime determinatae ; scutellum subrotundum : metathorax transversus, 

 mediocris : petiolus brevissimus : abdomen fusiforme, laeve, nitens, supra 

 depressum, subtus carinatum, apice attenuatum et acuminatum, thorace an- 

 gustiuset multo longius ; latera subcompressa : pedes simplices, subaequales : 

 alae mediocres; nervus ulnaris humerali multo longior, radialis nullus, cu- 

 bitalis brevis. 



Sp. 2. Cirr. Brunchus, Fern. Ater, abdomen nigro-cupreum, antennee 

 piceee, pedes flavi, femora nigra, alee limpidee. 



Ater : oculi et ocelli run" : antennae piceae, basi nigrae : abdomen nigro- 

 cupreum : pedes flavi; coxae nigrae ; trochanteres picei; femora nigra; 

 tarsi apice fusci : alae limpidae ; squamulae piceae ; nervi proalis fusci, me- 

 talis flavi. (Corp. long. lin. ^ ; alar. lin. 1-J-.) 



Found by Dr. Greville, near Edinburgh. 



XXVI. — Hints on the Anatomico-Physiological Differences in 

 the Organization of Stems. By Dr. M. J. Schleiden.* 



I have been constantly surprised in reading the numerous 

 controversies on the differences between monocotyledonous 

 and dicotyledonous stems, to find that, in general, they con- 



* Translated from Wiegmann's Archiv, part 3, 1 839. 



