76 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



4. Tibia of anterior leg black except for minute yellow basal ring, all clothed 



with black hairs ; apical fourth of ventral surface of Sc with at least 2 or 3 



rows of hairs, the basal three-fourths with a single row smarti Vargas 



Tibia of anterior leg with basal half yellow, this part clothed with appressed 

 silvery-white hairs ; apical sixth of ventral surface of Sc with at most 2 

 rows of hairs, the basal five-sixths with a single row. . . .mexicanum Bellardi 



5. Base color of mesonotum light brown, almost orange 6 



Base color darker, approaching copper red 8 



6. Scalelike hairs on mesonotum silvery white ; femur of anterior leg with three 



transverse dark bands ; average length of fly 2.5 mm pulverulentum Knab 



Scalelike hairs on mesonotum golden yellow; femur of anterior leg without 

 these dark bands ; average length 3.1 to 4.0 mm 7 



7. Hairs on clypeus black; Sc pilose on basal three-fourths; average length 4.0 



mm rubicimdulum Knab 



Hairs on clypeus yellowish white ; Sc pilose only on basal half ; average length 

 3.1 mm yepocapense Dalmat 



8. Sc pilose at least along basal half, often with additional hair near apex; Ri 



pilose from point of origin of R2+3 ; height of fronto-ocular triangle 2.2 times 



base acatenangocnsis Dalmat 



Sc pilose only along basal fourth ; Ri pilose from a point beyond origin of 

 R2+3; height of fronto-ocular triangle 1.6 times base mathesoni Vargas 



SPECIES OF THE SUBGENUS HEARLEA, BASED ON FEMALE CHARACTERS 



1. Postnotum with several long, narrow, appressed, yellow, scalelike hairs. 



ethelac Dalmat 

 Postnotum bare, without scalelike hairs 2 



2. Buccopharyngeal apparatus with pronounced indentation on median space. . . .3 

 Buccopharyngeal apparatus with median space evenly concave, without any 



pronounced indentation at its midregion 5 



3. Median space of buccopharyngeal apparatus serrated burchi Dalmat 



Median space of buccopharyngeal apparatus not serrated 4 



4. Cornuae of buccopharyngeal apparatus simple, pointed, not expanded ; base of 



fronto-ocular triangle 1.5 times its height nigricornis Dalmat 



Cornuae of buccopharyngeal apparatus expanded; base of fronto-ocular tri- 

 angle equal to its height capricornis De Leon 



5. Femora of all legs dark brown to black larvispinostim De Leon 



Femora of legs either yellow, or yellow with small dark areas 6 



6. Median space of buccopharyngeal apparatus serrated ; scalelike hairs on meso- 



notum long, bronze to copper in color ; length of ovipositor i\ times the base. 



microbranchium Dalmat 

 Median space of buccopharyngeal apparatus smooth ; scalelike hairs on meso- 

 notum very short, pale yellow in color ; base of ovipositor equal to, or 

 greater than, its length 7 



7. Cornuae of buccopharyngeal apparatus broad, spatulate ; base of ovipositor 



greater than its length delatorrei Dalmat 



Cornuae of buccopharyngeal apparatus sharply pointed; ovipositor dome- 

 shaped, its base equal to its length carolinae De Leon 



