472 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



obviously present; a slender mesal process dorsally on aedeagus; 

 aedeagus with a pair of short rods basally, and 2 pau-s of processes 

 near midlength, ventral pair a straight pointed process, lateral pair 

 spiraling dorsally. 



Holotype, pharate cf: Ecuador: Napo-Pastaza Province, Rio 

 Chingual, 8 miles east of El Pun, 8000 ft., May 4, 1958, R. W. Hodges 

 (USNM Type 66021). Paratype d": Peru: Chosica, 2800 ft., June 9, 

 Parish (MCZ). 



Larva. — None fully grown. Structure generally the same as in 

 Mortoniella apiculata, differing as follows: Tarsal claws with basal 

 projection large, seta small arising near its base (fig. 7,1); posterior 

 margin of ninth tergiun concave; anal claw with 3 pairs of accessory 

 teeth. 



Pupa. — Mandibles with distal tooth small near apex of inner mar- 

 gin; inner serrate margin proportionately longer than in Mortoniella 

 (fig. 7,^). Remainder of pupal structures lacking on specimen 

 available. 



Case. — Basically the same as in Mortoniella, differing as follows: 

 More slender; anterior and posterior openings not projecting ventrad 

 and formed loosely of silk and sand (fig. 7,/); dorsal respiratory 

 opening cylindrical and rimmed with silk (fig. 7,g). 



Material. — Larvae and pupa from type locality in Ecuador. 



Mexitrichia aequalis, new species 



Figure S,d 



The male genitalia of this species are unlike those of any other in the 

 genus; indeed the genitalia approach those of the type of Mortoniella 

 in several respects. The shape of the tenth tergum, the dorsal and 

 lateral processes of the aedeagus, and the 2 pairs of ventral processes 

 are indicative of this relationship, although the shape of the ventral 

 processes is different. However, the venation of aequalis, although not 

 entu'ely clear, is definitely not Mortoniella. 



Adult. — Length of forewing 2 mm. Color of specimen in alcohol 

 pale brown, with membrane pale at anastomosis. Venation about as 

 figured for M. atenuata. Abdomen with a pointed process apically 

 on sixth sternum. Male genitaha (fig. 8,c?): Ninth segment oblique, 

 anterior margin rounded, posterior straight; tenth tergum composed 

 of dorsal and ventral lobes extending posteriorly for the same distance, 

 with a ventral rodlike thickening and posterior margin scalloped; 

 dorsal process of aedeagus of uniform thickness, sharply upcurved 

 before apex, lateral process slender extending as far posteriorly as 

 dorsal process; aedeagus ventrally with a pair of rounded processes 

 basally and 2 pairs of elongate processes near midlength, one pair 



