1921] NATURAL SCIENCES OF PHILADELPHIA. 293 



veinlets. Wings with width much greater than half their length; 

 costal veins clubbed distad, ulnar vein unbranched, intercalated 

 triangle moderately large, radiate field folding fan-wise. Dorsal 

 surface of abdomen with median segment specialized mesad. Sub- 

 genital plate asymmetrical, but not as strongly so as in CeuthobieUa 

 and of a distinct general type. Ventro-cephalic margin of cephalic 

 femora armed with (1 or 2) moderately heavy, elongate spines^'" 

 succeeded by a row of minute spiniform hairs, terminated by two 

 slender, elongate spines, elongate in increasing ratio distad ; ventro- 

 caudal margin unarmed. Median and caudal femora with a few hairs 

 on the ventral margins, the more distal of which are replaced by spines 

 in lepta, but not in fulveUa. Pulvilli absent. Moderately well-de- 

 veloped arolia present between the simple, symmetrical tarsal claws, 



Ceuthobia lepta>-< new species. Plate XIII, figures 5 and 6. 



Males of the present species are recognizable by their slender form, 

 weak pilosity of head, pronotum and tegmina, elongate tegmina 

 with numerous costal veins, armed caudal femora and specialization 

 of the subgenital plate. 



The general type of the latter feature is much as in C. fulvella 

 (Rehn), though distinctive specific difference is shown. The color- 

 ation of these two species is similar. 



Type: cf ; Cordoba, Cordoba, Argentina. (E. Schulz.) [Hebard 

 Collection, Type no. 674.] 



Size very small, form very slender, surface polished and very 

 Aveakly supplied with minute, erect hairs. Head projecting, sur- 

 face smooth and polished, supplied with scattered, minute, erect 

 hairs; space between antennal sockets three-quarters as wide as 

 interocular space, the latter slightly over twice the occipital depth 

 of the large eyes. Ocellar areas large, their flattened surfaces form- 

 ing a sharp angle with the intervening area. Distal joint of maxil- 

 lary palpi as long as combined length of second and third joints, 

 expanding evenly to beyond median point, thence with ventral mar- 

 gin oblique to the acute apex; third joint very slightly longer than 

 fourth. Pronotum rounded symmetrically trapezoidal in form, 

 surface weakly convex, latero-caudal sulci of disk represented by 

 broad and weakly concave areas diverging cephalad much as in 

 fulveUa, surface supplied with a few minute, erect, scattered hairs. 

 Tegmina delicate, very elongate, with pilosity subobsolete, apex 

 broadly rounded; costal veins numerons (13 to 14) and weakly 

 oblique as in fulveUa, anal field elongate pyriform, anal sulcus dis- 

 tinct; discoidal sectors (6) broken beyond apex of anal field, con- 

 nected by moderately well developed cross-veinlets which form 



1^' In fulvella decided reduction is shown, these proximal spines being absent 

 and but one distal spine being developed. 

 ^^* From Xzz'ZT, = slender. 



