BY FREDERICK A. A. SKUSE. 219 



Genus 1. Corethra. 



BB. Anterior legs inserted a distance from the others j pectus 

 very prominent. 

 C. Terminal joint of the antennas very long in $. 



Genus 2. Chironomus. 

 CC. Penultimate joint of the antennse very long in (J. 



Genus 3. Tanypus. 



AA. Antennae plumose at their base only, or bare. 

 D. Antennse plumose in (J. 



Genus 4. Ceratopogon. 



DD. Antennge without plumes. Posterior legs very 

 long. 



Genus 5. Macropeza. 



The genus Corethra should properly have been placed among 

 the Culicidee, a position it now occupies; the others are 

 typical genera of the Chironomidse. Since Macquart's work 

 numerous genera have been established, and many have been 

 erected upon such slender grounds as to be quite worthless. 

 Forcipomyia, Palpomyia, and Serromyia, Megerle (in litt.), Priono- 

 irnyia, Sphceromias, SiiidLahidomyia. Stephens, Culicoides, Latr.,and 

 Eeteromyia, Say., might be considered sub-genera of Ceratopogon, 

 but I agree with Loew that this division has not been executed in 

 a sufficiently satisfactory manner. By it, some very subordinate 

 characters would be raised to sub-generic rank. Rondani's genera 

 Apogon^ Serromyia, and Alasion are insufficiently characterised. 

 Philippi's genera Podonomics, Psychophcena, Spaniotoma, Penta- 

 neura, Tetrapliora, and Heptagyia, of which he referred only the 

 first-named to its correct family, are poorly described, and another 

 examination of the types may prove some of them unwarrantable 



