12 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



genitalia. It differs strikingly from the type-species, C. lodora 

 Mosely, in having a dorsal process from the clasper. 



Adult. Length of forewing 2.5 mm. Color in alcohol blackish 

 brown. Male genitalia: Eighth sternum produced beneath ninth 

 segment. Ninth segment with a rectangular dorsomesal emargina- 

 tion, and a short lateral process bearing several long setae. Clasper 

 divided into an elongate, quadrate ventral lobe, and a long tapering 

 dorsal process whose tip meets mesally the tip of the other process. 

 A pair of ovoid plates covering the aedeagus laterally. Aedeagus 

 apically sclerotized and slightly decurved, beneath this a single 

 spine, a pair of plates lateroventrally slightly beyond midlength, 

 a mid-dorsal dome, basal loop large and complete. 



Holotype, male: Panama, Canal Zone, Rio Agua Salud, Mar. 30, 

 1965, Duckworth. 



Ochrotrichia cruces, new species 



Figures 46, 47 



This species shows some relationship to 0. mono Ross, from which 

 it is distinguished by the proportionately broader clasper and different 

 structure of the tenth tergum. 



Adult. Length of forewing 3.5 mm. Color fuscous, wings mostly 

 denuded, but apparently with some patches of white hair. Male 

 genitalia : Ninth segment rather quadrate laterally, deeply emarginate 

 dorsally. Clasper broadly triangular in lateral aspect, with a ventral 

 row and apical patch of black pegs on mesal face. Tenth tergum 

 complex, with an elongate spine arising dorsomesally curving to 

 right side, a short, black-tipped spine arising slightly beyond, apically 

 with another longer spine, whose tip is directed ventrally, on right 

 side a broad thin plate bearing a short spine mesally. 



Holotype, male: Mexico (Mexico), Las Cruces National Park, 

 La Marquesa, 3000 m elevation, July 5-9, 1965, Flint and Ortiz. 



Metrichia mexicana, new species 



Figures 48-51 



I am tentatively placing this species in the genus Metrichia, to 

 which it will key, although the genital pattern seems quite different. 

 From M. nigritta (Banks) it differs in the large lobate tenth tergum 

 and the lack of heavy spines from the aedeagus. 



Adult. Length of forewing 2.5 mm. Head and appendages cream 

 colored, tarsi annulate, forewings with large cream-colored patches 

 of hair mixed with fuscous spots. Male genitalia : No processes from 

 sterna. Ninth segment rounded anteriorly. Tenth tergites emerging 

 imperceptibly from ninth segment, cleft mid-dorsally, apices rounded 



