by frederick a. a. skuse. 57 



Synopsis op Genera.* 



I. Antennfe 13-jointed ; male forcepa of a complex structure. 

 No nasus to rostrum. No discal cell. Anterior branch of second 

 longitudinal vein obsolete. 



Prsef urea very short ; great cross-vein 



before the proximal end of fourth 



posterior cell Dolichopeza, Curtis. 



Prsef urea wanting ; great cross- vein 



beyond the proximal end of fourth 



posterior cell Scamhoneii^ra, O.-Sack. 



II. Antennae less than 13-jointed; male foi'ceps small, of 

 simple structure. Distinct nasus to rostrum. Discal cell present. 

 Anterior branch of second longitudinal vein present. 



a. Wings crystalline ; fifth posterior 



cell not in contact with the discal 



cell il/ie^z'stocera, Wied. 



b. Wings not crystalline; fifth pos- 



terior cell in contact with the 



discal cell 

 Head on a neck-like prolongation of 



the thorax ; seventh longitudinal 



vein short, running into the anal 



angle , Brachypremna, O.-Sack. 



Head more closely applied to the 



thorax ; seventh longitudinal 



vein reaching the posterior 



border some distance from the 



anal angle Tanypremna, O.-Sack. 



Genus 1. Dolichopeza, Curtis. 



Dolichopeza, Curtis, Brit. Entom. II. p. 62, 1825; Meigen, 

 Syst. Beschr. VI. p. 283, pi. 65, figs. 10-11, 1830; Macquart, 



* Based on that by Baron Osten-Sacken (Studies I. p. 156, 1886). 



