THE SYRPHIDAE OF OHIO 87 



Allograpta Osten Sacken 



42 A. obliqua Say. For description of life-stages see Part II, p. 

 58. Common, Columbus, I.akeville, Sandusky, Put-in-Bay; early July 

 to early September. 



Xanthogramma Schiner {P/iilhelms) 



. I Dorsum of thorax before the scutellum with two, coalescent, light-yellow spots; 



wings with a brown anterior margin *aequalis Loew ( Pa., D. C, N. J.) 



Dorsum of thorax without yellow spots on hind margin; wings not' brown 



in front 



2 



2 Pleurae with distinct brig/U yellow spots of ground color flavipes 



Pleurae without distinct bright yellow spots of ground color - 



3 Yellow band on second abdominal segment attains the lateral margin; 



all three abdominal bands often interrupted; black stripes on front of 

 female thinning out before reaching the antennae; antennae and hind leg 



usually dark ^_, • '. 



■' emarginata 



The yellow band of the second abdominal segment is separated by a distinct 

 black interval from the lateral margin, the abdominal bands usually dis- 

 tincly narrowed at the ends; black stripe on front of female reaches the 

 antennae, slightly expanded below; antennae aiid hind legs usually lighter 

 felix 



43 X. emarginata Say. Two males, Wauseon, and seven females, 

 Ira; August 23 to September 9. 



44 X. felix Osten Sacken. Very near to A", emarginata. Six 

 females, Ira, Wauseon; August 2)^, September 7. (Fig. 223.) 



45 X. flavipes Loew. Four males, Sandusky, Cincinnati, Hinck- 

 le}-; one female Ira; early June to late August. 



Mesogramma I.oew ( Toxouiems) 



1 Hind femora in male thickened and arcuate, the tibiae dilated at tip geminata 

 Hind femora in male simple 2 



2 Scutellum yellow, legs yellow, except the hind tarsi 3 



Scutellum black with yellow margin; front of female much narrowed above 



hind femora in part black *<56>i-m Macq . (Montreal, N. J., Fla., Ga.) 



Scutellum black or brown with a yellow border; front of female above only 

 a little narrowed; hind femora wholly yellow marginata vart 



3 Front of female only a little narrowed above; third to fifth abdominal seg- 



ments with narrow lateral yellow margins. marginata 



Front of female much narrowed above; third to fifth abdominal segments no 

 yellow on the margins polita 



46 M. geminata Say. Five males and one female, Columbus. 

 Medina, Wauseon; early May to mid-September. (Fig. 213.) 



Syrp. 7 



