TROIS LEP1DOPTERES NOUVEAUX DE LA RIOJA, REP. ARGENTINE. 225 



The figures will largely explain themselves, so that a detailed 

 description is unnecessary. In the pupal wing the tracheae of the 

 future veins are shown as black lines. The pale vein cavities, 

 visible in the pupal wing but lacking a trachea, are shown as 

 dotted lines. These, of course, should appear in the imaginal 

 wing as veins, though sometimes difficult to see. The figures 

 ■of pupal wings are drawn to a larger scale than the imaginal 

 wings. 



Comparison of the fore wings of pupa and imago shows that 

 the apparent cross-vein between Sc and R x is really >SV 3 , and 

 the terminal portion of apparent R x is also Sc.,. The trachea of 

 jRj ends by bending anteriorly along the cross-vein, and does not 

 continue to the outer margin. No other cross-veins in the wings 

 are preceded by tracheae. Another interesting point in the 

 venation of the fore wings, in all Coniopterygids, is the apparent 

 crossing of radius and media in the basal fourth of the wing. 

 From the pupal venation this is seen to be only an approximation 

 of the two veins, which then diverge. 



The hind wings are very peculiar, and in the pupa appear to 

 promise a more complex venation than actually matures. Sc and 

 R x apparently coalesce at their extremities. This is not truly so. 

 jRj often does not exist in the pupal wing, its place here being 

 taken by the recurrent Sc z . More usually, however, R x has been 

 found present, though short and weak. The radial sector is well 

 developed, and its trachea is bent slightly at the future point of 

 junction with the cross-vein to media. The media is unbranched. 

 Cu-l and Ch 3 are both present, but although the pupal wing shows 

 a pale channel for an anal vein, there is no trachea to be seen 

 within it. 



The main interest of the venation is the bifurcation of the 



subeosta. The presence of Sc x and Sc 2 is generally regarded as 



primitive, and since the Coniopterygidae are admittedly archaic 



in many respects, though highly specialised in others, this 



additional primitive character is of interest. 



Walthamstow ; 



August 26th, 1922. 



TROIS LEPIDOPTERES NOUVEAUX. DE LA RIOJA, 

 REP. ARGENTINE. 



Par E. Giacomiclli. 



1. Psectrotarsia tamsi, sp. nov. 



Port et taille de Psectrotarsia fuscirena, Bamps. Cote superieur: 



Primaires d'une couleur verte ochracee claire tendre, tout uniforme. 



Les secondares blanches, avec une bande brune au bord, suivante 



_parallelement a toute la frange ; cette bande disparaft dans quelquea 



