124 Mr. A. Henfrey on the Progress of Physiological Botany : 



L. Theugenis. Lept. alis omnibus supra laete flavis, anticis macula 

 media costali apiceque nigris, posticis margine externo nigro. ^ . 

 Exp. alar. 2 unc. vel 50 millim. 



Hab. Bolivia. 



Anterior wings elongate, rounded at the apex, the first sub- 

 costal nervule anastomosing with the costal nervure. Above : 

 bright yellow, the apex from the termination of the first sub- 

 costal nervule to that of the third median nervule black ; this 

 black patch united to a spot of the same colour occupying the 

 outer margin as far as the termination of the first median nervule. 

 Posterior wings yellow, the outer margin fuscous from the apex 

 to the first median nervule ; the fuscous margin broadest at the 

 apex. 



Below : anterior wings yellow on the costa and at the apex, the 

 dark markings of the upper surface slightly indicated ; the rest 

 of the wing whitish, the inner margin with a large spot of a 

 chalky appearance. Posterior wings yellow, with two pale brown 

 bands, the first extending along the subcostal nervule to its ter- 

 mination, the second below the cell extending from the sub- 

 median nervure to the second subcostal nervule, which it just 

 crosses. 



Head, thorax and abdomen brovni above, yellow below. An- 

 tennse black. Legs, except the coxse, black, with a pale yellow 

 line on each side. 



In the collection of the British Museum. 



This species is closely allied to Lept. Melite, from which how- 

 ever it may be known by the want of the black vitta on the inner 

 margin and of the yellow spot in the black of the apex, indepen- 

 dent of some less striking differences. 



XV. — Reports on the Progress of Physiological Botany. No. 3. 

 By Arthur Henfrey, F.L.S. &c. 



Anomalous Forms of Dicotyledonous Stems. 

 Prof. Trevira^nus* has published an exceedingly interesting 

 essay on the anomalous forms under which the wood presents 

 itself in certain dicotyledons, in which he endeavours to arrive at 

 some general conclusions as to the regulating causes. The essay 

 is a kind of critical examination of all the observations hitherto 

 published on the subject, interspersed with the results of new 

 investigations undertaken by the author with a view to explain 

 or confirm the views of other writers. 



Our attention is first directed to those remarkable bodies called 



* Botanisclie Zeitung, May 28, 1847. 



