MAY FLIES AND MIDGES OF NEW YORK 161 



narrow, very hairy, venation as shown on pl.37, fig.16. Legs 

 hairy, elongate, especially the tarsi; first tarsal joint equal to 

 the two following in length; fourth and fifth together equal to 

 the third. Type, P. grisea Ph. Chile. No North American 

 species. 



Genus 21. Podonomus Philippi 

 Verb. z. b. Ges. 7. 601. 1865 



Thorax strongly produced over the head. Antennae of the 

 female short, subcylindrical, verticillate with long hairs, eight (?) 

 jointed, the last joint equal to the two or three preceding (pl.37, 

 tig.10). Venation as shown on pl.37, fig.ll. Legs elongate, equal, 

 tarsi elongate, the metatarsus a,bout the same length as the tibia, 

 the second about one half as long as the first, the remaining ones 

 short and of equal length. Type, P. stigmaticus. Chile. 



From the wing venation it appears that this genus is related to 

 the group T a n y p u s. No North American species. 



Genus 22. Heptagyia Philippi 



Verb. z. b. Ges. 41. 635. 1865. (Pl.37, figs. 21, 22, 23) 

 Head small. Antennae short, 7- jointed, cylindrical, first joint 

 large and thick, the following subequal, the last one oblong, equal- 

 ing the two preceding ones taken together. Ocelli none. Palpi 

 long, 6-jointed, almost exceeding the antennae, first three joints 

 subcylindrical and equal, the fourth and fifth shorter and sub- 

 globose, the last one slender, oblong, equalling the fifth one in 

 length. Thorax very much swollen, with a deep suture near and 

 parallel to the anterior margin. Wing venation as shown in fig.21. 

 Legs elongate, slender, anterior femora not thickened, not armed, 

 anterior tibiae with unarmed extremities, posterior tibiae with 

 minute apical spines; tarsi elongate, first joint nearly equalling 

 the remaining ones in length. Type, T. annulipes Ph. 

 Chile. No North American species. 



Genus 23. Corynocera Zetterstedt 

 Insect a lapponica 856. 1838 



Head moderately large, transverse; antennae porrect, shorter 

 than the thorax, arcuate, cylindrical, about 12-jointed; the first 

 joint short, thick, bare, the following 10 very small, rounded, 

 closely sessile, delicately haired, the 12th elongate, conical, wider, 



