244 April, 



I have only to say in addition of these typical larvse, that the green is 

 more lively and full, and the pink along the lateral region is dai'ker, 

 inclining to purplish. 



It only remains for me to state that my experiments have proved 

 to me the truth of what Zeller long ago suspected, and since then 

 Newman and others have believed, that Artaxerxes, Salmacis, and 

 Medon {Agestis), are but one species. 

 Einswortli : February 4-th, 1879. 



DESCEIPTION OF a NEW SPECIES of BETJERINA from COSTA EICA. 

 BY R. McLACHLAN, F.R.S., &c. 



HETiEETNA MAXIMA. 



? immature. Bronzy -brown. Head black above ; the base of anternise yellow : 

 front green, clothed with blackish hairs: nasus metallic-blue, green at its base: 

 labrum chalybeous. Thorax apparently with a yellow median carina and four yellow 

 lines on either side (damaged). Legs blackish, distinctly yellowish internally. 

 Abdomen bronzy ; without markings. 



Wings hyaline, slightly tinged, no pterostigma : the base of the wing (especially 

 in the anterior) occupied hy a very dense reddish netivork (as is usual in the $ of 

 Setcerina), giving the wings the appearance of being reddish at that part. 27 

 ante-cubital, and 32 post-cubital nervules in the anterior-wings. 



Length of abdomen, 38 mm. Length of posterior-wing, 40 mm. Expanse, 

 83 mm. 



Mount Irazu, 6000-7000 ft. (Eogers). 



It is much to be regretted that only the $ (and that immature) 

 of this species has been received. No known species has, in this sex, 

 the same dense reticulation at the base of the wing (the nearest 

 approach to it being found in S. iasalis), and it appears to me 

 possible that the adult $ may have the base of the wings red, as is 

 usual in the ^ of nearly all the species. It is the largest yet known, 

 the size being only occasionally attained by the ^ of the anomalous 

 a. Borchgravi. 



This insect was received by Messrs. Godman and Salvin from 

 Mr. Eogers, their collector. I believe it to represent the ? of an 

 undescribed species allied to S. basalts, or rather to the condition of 

 that species known as S. californica. 



With the exception of K. cruentata which occurs, in the collection 

 sent by Mr. Eogers, in great numbers, the only other Hetcerina from 

 the same locality is apparently a form of S. majuscula, but the general 

 aspect of H. maxima precludes the probability of the type being a 

 dimorphic condition of that species ; the colour of the legs, and other 

 characters, point to a connection with hasalis and californica. 

 Lcwisham, London : 1878. 



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