NO. I BLACK FLIES OF GUATEMALA — DALMAT J'J 



SPECIES OF THE SUBGENUS LANEA, BASED ON FEMALE CHARACTERS 



1. Mesonotum orange or yellow 2 



Mesonotum gray, dark reddish brown, or black S 



2. Hairs on occipital region long and black, with few, if any, yellow scalelike 



hairs 3 



Hairs on occipital region yellow, scalelike, with few, if any, long black ones. .4 



3. Claw of hind tarsus without teeth ; tergites of abdominal segments 3 and 4 dark 



brown to black ; in fresh or alcoholic specimens, the dorsum of each of these 

 segments divided into 3-5 square to rectangular dark patches separated by 

 yellow ; tergites of segments 7 and 8 not shiny yellow. 



dounui Vargas, Martinez, and Diaz 

 Claw of hind tarsus with one or two teeth ; abdominal tergites 3-8 graduating 

 from brown to black, never divided into square or rectangular patches. 



callidum (Dyar and Shannon) 



4. Claw of posterior tarsus with a single small tooth near base ; longitudinal 



bands on mesonotum not comiected anteriorly, running parallel to each other, 

 approximately of equal width all their length, fusing with white pruinosity 



of prescutellar region ; basal half of Sc pilose colznni Dalmat 



Claw of posterior tarsus without teeth ; longitudinal bands emerging from 

 transverse pruinose band on anterior margin of mesonotum, wider ante- 

 riorly, diverging posteriorly, each passing to the side of the prescutellar 

 depression ; basal two-thirds of Sc pilose samboni Jennings 



5. Mesonotum completely gray-pruinose, except for a single longitudinal, copper- 



colored band which is found on the midline, extending along approximately 

 three-fourths of the length of the mesonotum. 



diigcsi Vargas, Martinez, and Diaz 



Mesonotum dark reddish brown or velvety black with two longitudinal white- 



pruinose bands, one on either side of the midline 6 



6. Mesonotum dark reddish brown, the longitudinal bands not very broad; Sc 



pilose along its basal three-fifths trknttatiim Malloch 



Mesonotum velvety black, the longitudinal bands very broad 7 



7. Longitudinal bands of white pruinosity so situated on either side of midline of 



mesonotum that the distance between them is less than the width of one 



band ; only basal fourth of Sc pilose haematopotnin Malloch 



Longitudinal bands farther apart ; basal two-thirds of Sc pilose. 



veracriisanum Vargas, Martinez, and Diaz 



SPECIES OF THE SUBGENUS SIMULIUM, BASED ON FEMALE CHARACTERS 



1. Buccopharyngeal apparatus with teeth on median space 2 



Buccopharyngeal apparatus without teeth on median space 4 



2. Mesonotum yellow orange, without scalelike hairs; Ri completely pilose, with 



spines also along its distal two-thirds ochraccum Walker 



Mesonotum black, with yellow scalelike hairs ; Ri pilose and with spines along 

 distal half only 3 



3. Median space of buccopharyngeal apparatus with 4 rows of broad, blunt teeth ; 



claw of posterior leg with submedian tooth. 



parrai Vargas, Martinez, and Diaz 



