NEOTROPICAL CADDIS FLIES I — FLINT 



473 



arising on midline curving laterally and then posteriorly, the other 

 pair contiguous mesally and extending straight posteriorly, 



Holotype cf : Peru: Rio Pichis, Puerto Bermudez, July 17, 1920, 

 Cornell University Expedition lot 569, sub 261 (CU Tj-pe 3892). 



Mexitrichia atenuata, new species 



Figure 8,c-& 



^ This species seems quite isolated within the genus, but may perhaps 

 be^closest to M. aries. The pair of slender processes rising laterally 

 onUhe aedeagus is distinctive. 



! Adult. — Length of forewing 3 mm. Color of specimen in alcohol 

 pale brown. Venation as in figure 8,a. Sixth sternum with an 



Figure 8. — a, b, Mexitrichia atenuata: a, venation; b, male genitalia, lateral; c, Mexitrichia 

 aries, lateral view of male genitalia; d, Mexitrichia aegualis, lateral view of male genitalia; 

 e, Mexitrichia elongata, lateral view of male genitalia;/, Protoptila bicornuta, lateral view 

 of male genitalia. 



