168 INSECUTOR INSClTl.^i MENSTRUUS 



pair narrower. Last four abdominal segments with a large 

 silvery spot on each side near base ; a well-marked median 

 abdominal vitta of brown. Tegulse watery, faintly fuscous. 

 Costa and wing veins well clouded. 



Phyllolabella, new genus. 



Genotype, Phyllolabella robusta, new species. 



This is a Paraporia group form with the abdomen shortened 

 and stout, the clypeus sunken, the facialia widened and ciliate. 

 The labella are unusually large, even for this group, and leaf- 

 like. Epistoma warped, full width, short. Eyes thickly pilose. 

 Proboscis short. Palpi wide, sticklike, heavy, bare below and 

 on outer basal half or more of upper side. Abdomen broadly 

 oval in both sexes, subrounded anally. 



Phyllolabella robusta, new^ species. 



Length, 10.5 to 13 mm. One male and one female, Chapada, 

 Brazil (H. H. Smith). 



Brownish to chestnut, silvery pollinose, with faint golden 

 tinge. Palpi fulvous. Third antennal joint largely rufous. 

 Frontalia dark brown. The outer heavy and inner narrow 

 dark brown or blackish thoracic vittse of each side are closely 

 approximated. First abdominal segment and a large irregular 

 triangle on each side of second and third segments dark brown ; 

 irregular lateral vitta on anal segment shading from brown or 

 light brown to rufous behind. Legs brown, tarsi a Httle darker. 

 Tegulae nearly white. Wings nearly clear, the veins faintly 

 and narrowly smoky in male. 



Pelecotheca, new genus. 



Genotype, Pelecotheca panamensis, new species. 



Differs from Buthelaira as follows: Eyes thinly hairy. 

 Arista practically bare, only microscopically short-pubescent. 

 Third antennal joint of female very slender. Anal segment 

 with a marginal row of heavy erect macrochaet?e and without 

 discals. Female theca heavy, corneous, axlike in shape, its 

 plane in the vertical. 



