218 U.S. NATIONAL MUSEUM BULLETIN 261 



lateral aspect moderately produced, with posterior margin broadly 

 rounded, with numerous dispersed microsetae on posterior half of disc, 

 processes slender and elongate but not extending as far posteriorly as 

 posterior pygofer margin; plates each truncate apically and with few 

 dispersed microsetae on posterior half; style longer and more slender 

 than usual in the genus, with a weak preapical lobe; aedeagus sym- 

 metrical, with three pairs of short processes, one pair near mid length 

 of shaft and two pairs at shaft apex ; paraphyses occurring as a single 

 median reduced sclerite. Other structural characters as in tenebrosa. 

 Female unknown. Color of anterior dorsum dull yellow with weak 

 fuscous markings poorly delimiting several areas on crown of head, 

 three spots in a transverse row on disc of pronotum, the basal angles, a 

 median basal spot and a pair of spots behind transverse sulcus of 

 scutellum; face sordid yellow with a transverse area on clypeus and a 

 median longitudinal area on clypeus and clypellus, black. 



Holotype male. Hacienda Maria, Cuzco, Peru, Feb. 26, 1952 

 (F. L. Woytkowski), Rio Cosnipata, 900 m., on indefinite loan to 

 USNM from NCS; sixteen additional topotypic specimens and three 

 specimens, Rio Huallaga Valley, Huanuco, Prov., Peru, February 

 (NCS) ; one male from an unknown Bolivian locality (HNHM) ; and 

 one male, Rio Monzon Valley, Peru, October (CAS). 



This species differs from all others in the genus in the truncate male 

 plates and in the occurrence of an unpaired basal plate between the 

 connective and aedeagus, which must be considered as a homologue of 

 paraphyses, although in consideration of the other species in the genus 

 there seems no doubt that it has arisen secondarily. 



Dichrophleps hamata, new species 

 Figure 203 



Length of male 16.5 mm. Head with ocelli each slightly closer to 

 adjacent anterior eye angle than to median line. Thorax with posterior 

 portion of scutellum very obscurely striate. Forewings suffused with 

 amber, translucent, with the membrane including apical cells and 

 apical portion of inner two anteapical cells, claval vein with posterior 

 fork occurring more basally than in D. tenebrosa, new species, and with 

 a short crossvein extending towards commissural margin opposite 

 scutellar apex. Hindlegs with femoral setal formula 2:1:1:1. Male 

 pygofer with ventral processes slender and elongate, each rounded 

 apically and bearing a number of small microsetae, not extending as 

 far posteriorly as posterior pygofer margin; plates broadly rounded 

 apically, each with a few anteapical very small microsetae; style 

 extending approximately as far posteriorly as apex of connective, with- 



