NO. I BLACK FLIES OF GUATEMALA — DALMAT 8l 



Filaments arising in groups of 2-2-1-1-1-1, the ramifications occurring rather 

 high above basal stem ; the origin of the lowest single filament is quite 

 removed from that of the other filaments ; bases of two uppermost festoons 

 on each side of dorsal aperture somewhat removed from each other; four 

 simple trichomes on each side of midline of thorax mathesoni Vargas 



4. Respiratory apparatus composed of 10 filaments 5 



Respiratory apparatus composed of more than 10 filaments 7 



5. Six trichomes on either side of midline of thorax ; granulosity on abdominal 



segments i and 2 only 6 



No trichomes on thorax; granulosity on abdominal segments 1-4 



piilvendentuni Knab 



6. Entire dorsum of thorax with granulosity ; dorsal surface of abdominal seg- 



ments 1-2 with granulosity, except for midregion of segment i ; filaments 

 arise in groups of 4-4-2, the ramifications originating somewhat removed 

 from the base; filaments smooth, without microscopic spicules 



ardeni Dalmat 

 Granulosity on posterior fourth of dorsum of thorax only ; abdominal seg- 

 ments 1-2 with granulosity on their posterior margins only; filaments arise 

 in groups of 2-1-2-2-1, the branches emerging close to the base; filaments 

 covered with microscopic spicules ycpocapense Dalmat 



7. Respiratory apparatus with 12 filaments; anterior part of cocoon extended 



dorsally in form of two spatulate processes ; dorsal surface of cocoon form- 

 ing straight line in profile ; three long, simple trichomes on either side of 



midline of thorax mexicamim Bellardi 



Respiratory apparatus with more than 12 filaments ; anterior part of cocoon 

 not extended into spatulate processes ; more than 3 trichomes on either side 

 of midline of thorax ; dorsal surface of cocoon curved in profile 8 



8. Respiratory apparatus composed of 16 filaments ; rim of anterior aperture of 



cocoon not thickened, approximately parallel to base ; 2 bifid and 3 trifid 

 trichomes on either side of midline of thorax; single, anteriorly directed 

 spine on each lateral margin of abdominal segments ^-7. 



earlci Vargas, Martinez, and Diaz 



Respiratory apparatus composed of 18 filaments; thickened rim of anterior 



aperture of cocoon at marked angle to base; 6 simple trichomes, not very 



long, on either side of midline of thorax ; no spines on lateral margins of 



abdominal segments 2-7 smarti Vargas 



SPECIES OF THE SUBGENUS HEARLEA, BASED ON PUPAL CHARACTERS 



1. Cocoon without raised collar; respiratory apparatus antlerlike, with several 



branches 2 



Cocoon with raised collar ; respiratory apparatus in other form, at most with 

 dorsal and ventrolateral elements and posteromedially directed extension. . .3 



2. Secondary branches of respiratory apparatus with several further subdivisions 



at their apices, these being very short and close together, often appearing 

 like a crown of small spines, the 4 spines on either side of midline of second 

 abdominal segment equidistant from each other ; 10 short, stout, simple, 



spinelike trichomes on thorax la rv is pin o sum De Leon 



Secondary branches of respiratory apparatus with fewer, longer subdivisions, 

 these more distinctly formed, each with a single spine at its apex; on either 

 side of midline of second abdominal segment, the distance between the outer- 



