THE CACTUS-FEEDING PHYCITINAE — HEINRICH 335 



color alike in both sexes; 11 veins, 10 from the cell, 4 and 5 stalked, 

 2 and 3 from near lower outer angle of cell, approximate or separate ; 

 no costal fold or other secondary sexual modifications. Hind wing 

 with 7 veins; 7 and 8 approximate or anastomosing beyond cell 

 (never completely fused); 3 and 5 connate or stalked; 4 absent; 2 

 from cell before (but near) lower outer angle ; no sex scaling or other 

 sexual modifications ; structurally alike in both sexes ; color white in 

 the male (except in Cactohlastls hucyrus Dyar), white to fuscous in 

 the female ; cell about one-half the length of wing. Abdomen of male 

 with a pair (rarely two pairs) of ventrolateral hair tufts at base of 

 eighth segment or with eighth segment simple.^ 



Male genitalia with uncus broad, subtriangular, never hook-shaped 

 or otherwise modified ; the lateral edges sometimes slightly sinuate or 

 concave; apex rounded; outer (dorsal) surface densely covered with 

 ■ bristlelike scales. Gnathos terminating in a flanged and hooked 

 apical process, which is normally bifid but sometimes fused. Trans- 

 tilla represented by a pair of separate, more or less elongate, and 

 triangular plates; never forming a bridge or otherwise modified. 

 Harpe simple, without clasper or extensions from sacculus or costa; 

 apex broadly or obliquely rounded, rarely bluntly pointed {Tucii- 

 mania tapiacola Dyar). Anellus U-shaped, either flat or slightly 

 curved, the lateral arms often twisted slightly to rest against the 

 lateral sides of the aedeagiis, but otherwise unmodified. Aedeagus 

 straight or slightly sinuate; usually smooth, but occasionally with 

 a few very small scobinations at apex. Penis smooth, finely scob- 

 inate or with sclerotized wrinklings but not otherwise armed. 

 Vinculum stout and broad, short or long, with terminal margin 

 normally broadly rounded. 



Female genitalia with bursa copulatrix membranous, smooth or 

 with very minute scobinations on inner surface; signum frequently 

 absent, when present consisting of a small ribbed, weakly serrate, 

 finely scobinate or cupped plate; bursa never strongly sclerotized or 

 pigmented. Ductus bursae membranous throughout, never strongly 

 sclerotized; gradually widening into and not sharply differentiated 

 from bursa copulatrix. Genital opening normally simple, sornetimes 

 minutely scobinate, rarely with sclerotized dorsal or ventral plates 

 or a few setae on the inner surfaces of the ductus bursae at the open- 

 ing; otherwise unmodified or unarmed. Ductus seminalis from 

 bursa or, rarely, from ductus bursae near junction with bursa. 



Larvae. — Internal feeders in the fruits and stems of various cacti. 



• The eighth segment is considered to be simple when the sternite and tergite appear 

 merely as flat narrow sclerotized plates (compare figs. 8d, 17d, 21d) and are not developed 

 into sclerotized pockets or projecting processes, and when sensory hair tufts are absent. 



