416 



Key to Species 

 GROUP A 



Species u'itJi wings spotted or handed 



1. ]\resonotum glossy black, sometimes slightly brownish ; fore tibia3 



blackish brown ; fore tarsi blackened from base of apical third of 

 ])asal joint to apex of tarsi; wings with an ill-defined dark cen- 

 tral blotch (PI. XXXV, Fig. 2) 1. hracliialis. 



— Mesonotum and fore legs not colored as above; wing-markings 



either in the form of spots or bands which are well defined 2 



2. Wings each with about 11 dark spots located between the veins. . . . 



2. varipennis. 



— "Wings either banded or with 3 or 4 dark spots 3 



3. Wings each with 4 dark spots, one at cross vein, one at middle of 



second posterior cell, one on posterior branch of cubitus, and one 

 in anal cell 3. octopunctatus. 



— Wings either with 3 spots — none in second posterior cell — or with 



distinct fascia? 4 



4. Wings with 3 dark spots, 2 beyond the cross vein (one in the sec- 



ond posterior cell and the other in the fourth) , and one in the anal 

 cell, which is sometimes indistinct . 5 



— Wings with at least one complete fascia 6 



5. Halteres yellow ; spot in second posterior cell distinctly separated 



from cross vein; spot in anal cell distinct (PL XXXV, Fig. 3) . . 

 4. needliami. 



— Halteres blackened apieally ; spot in second posterior cell touching 



the veins forming base of cell ; all the spots very pale, the one in 

 anal cell indistinct 5. griseopunctatus. 



6. Wings with the markings deep black, forming 2 broad fasciae, the 



outer one before apex of wing and enclosing 2 small clear spots 

 (PI. XXXV, Fig. 4) ; apical third of fore femora thickened, 

 black, densely black-haired on blackened portion; basal three- 

 fifths of fore tibiee snow-white, apical two-fifths black, fore tarsi 

 white, a black band over bases and apices of basal 3 joints, apical 

 2 joints entirely blackened; basal joint twice as long as fore 

 tibia? 6. perpulclier. 



— Wing-markings grayish, outer fascia occupying apex of wing, with 



out clear spots; legs without sharply contrasted colors, generally 

 yellow with brownish markings 7 



7. Fascia at apex of wing faint and very narrow, the one at middle 



very broad, extending as far beyond cross vein as the distance 

 from its outer margin, in second posterior cell, to apex of wing. . . 

 7. pidcliripennis. 



— Fascia at apex of wing broader than the one at middle 8 



