SYNOPSIS OF NORTH AMERICAN SYRPHID^. 205 



large brown spot, exteiidiu"' from the furcation of the second and third 

 veins to the anterior cross- vein and from the costa to the base of the 

 third posterior cell. Marginal cell closed in the costa. 



One specimen. 



It is not impossible that more material will render these characters 

 of less value in separating this species from the foregoing. 



Four males from Waco, Texas, in the Kational Museum, since ex- 

 amined, all agree in the dichoptic character, and the brownish spot on 

 the wings. The marginal cell is open. The body is more elongate, and 

 the pile of the thorax more fulvous than in M. cimbiciformis. 



Mallota bipartita. 



Merodoti Mpartitus Walker, List, etc., iii, 599. 

 Mallota Inpartita Osten Sacken, Cat. Dipt., 135. 



Habitat. — Georgia (Walk.). 



"(? . Niger., antennis piceis setis fulvis, pedibus nigris tibiis basi pedi- 

 busque siihfus ferriigineis., aliis subcinereis fusco ad costam unimaculatis. 



" Body black, head shining, clothed with tawny and bhick hairs, 

 prominent about the mouth, which is black; feelers pitchy; bristle 

 tawny ; eyes black ; all the facets very small ; chest thickly clothed 

 with yellowish-white hair ; abdomen linear, shining, a little longer and 

 broader than the chest, thinly clothed with short tawny hairs, covered 

 more thickly toward the tip with black hairs; legs black, clothed with 

 short black hairs; shanks ferruginous towards the base ; feet ferru- 

 ginous beneath; claws and foot-cushions tawny: tips of feet black; 

 wings slightly gray with a small brown spot under the middle of the 

 fore-border; wing-ribs and veins pitchy; veins tawny toward the base 

 and along the fore-borders ; poisers tawny. Length of the body, 4^ 

 lines; of the wings, 10 lines." Walker, 1. c. 



'■'■ Merodon Bautias Walker is represented in the British Museum by a 

 single male specimen ; M. Mpartitus by four specimens, two of which 

 seem to be females of M. Bautias; the two others may be a different 

 species." Osten Sacken, 1. c. 



TRIODONTA.* 



Polydonta Macquart (non Fischer), Dipt., Exot. 4« Suppl., 144, 1850. 

 Triodonta Williston, Bull. Brookl. Entom. Soc, vii, 13G, 1885. 



Differs from Mallota in the eyes of the male being broadly separated, 

 bare ; in the male hind coxae, hind femora, and tip of hind tibise being 

 provided with spurs or protuberances ; in the abdomen of the male be- 

 ing narrowed posteriorly, and in the general pilosity being much less. 

 In our single species the color of the abdomen in the two sexes is strik- 

 ingly different. 



* Tpiodovi, with three teeth. 



