2oG Dr. Schleiden 07i the Anatomico-physiological 



aris ; 2"« basi ad apicem latescens; 8"* et sequentes lineares ; 4"* S^brevior, 

 5° longior ; clava fasiformis, articulo 5" paullo ktior et duplo longior : tho- 

 rax ovatus : prothorax transversus, brevissimus : mesothoracis scutum uni- 

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

 mots, optime determinatae ; scutellum subrotuudum, bisulcatum : meta- 

 thorax transversus, brevis : petiolus brevissimus : abdomen ovatum, supra 

 planum, subtus carinatum, apice acuminatum^ thorace paullo longius et la- 

 tius : pedes graciles, simplices, subaequales : alae latse ; nervus ulnaris hvi- 

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

 Sp. 1. Cirr. Teridce, Fem. Nigro-cupreusj antennes picea, pedes fusco- 



fulvi, femora nigro-cuprea, ales Umpidce. 

 Nigro-cupreus : oculi et ocelli rufi : antennse picese ; articuli l"®et2"*ni- 

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

 fulva; mesotibijE fulvse, fusco cinctee ; propedum tibise fulvae, tarsi fusci; 

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

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

 Found by Dr. Greville, near Edinburgh. 



Fem. C. Sotadi affinis ? 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 P* sublinearis ; 2"' longicyathi- 

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

 nata, articulo 5*> plus duplo longior : thorax ovatus : prothorax transversus, 

 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- 

 gustius et multo longius ; latera subcompressa : pedes simplices, subaequales : 

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

 bitalis brevis. 



Sp. 2. Cirr. Brunchus, Fem. Aler, abdomen nigro-cupreum, antenncB 



picecBf pedes ^avi, femora nigra, alee limpid(B. 

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

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

 tarsi apice fusci : alae limpidae ; squamulaj picese ; nervi proalis fusci, me- 

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

 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, 1839. 



