by frederick a. a. skuse. 27" 



Key to the Families op Nematocera. 



A. Thorax without any transverse sutui'e. 

 a. Tibise not spurred. 



* Wmgs haired. 



Longitudinal veins few Cecidomyidce. 1. 



Longitudinal veins numerous Psychodidce. 10. 



** Wings naked. 

 § No ocelli. 



\. Legs long ; antennae with more than 12 joints. 

 Costal vein continued round the 



margin of the wing Gulicidce. 7. 



Costal vein terminating near the 



tip of the wing Chironoviidce. 8. 



2. Legs rather short; antennae short. 

 Costal vein continued I'ound the 



posterior border Orphnephilidce. 9. 



3. Legs short ; antennae with less than 



12 joints Simulidce. 4- 



§§ Ocelli. ■ 



No discoidal cell Bibionidce. 5. 



A discoidal cell Rhyphidce. 13. 



b Tibiae spurred, 

 t Ocelli. 



Anterior tibite spurred Blepkaroceridce. 6 



All tihvM spurred Afycetophi/idce. 3. 



With or without spurs Sciaridce. 2. 



ft No ocelli. 



All tibiae spurred Dixidcu. 12. 



B. Thorax with a V'S'i^ped suture Tipulidce. 11. 



Terminology. 



Under this heading I shall include those teclinicalites eui- 

 ployed in the descriptions of Diptera, both exclusively or iu a 

 more or leas modified son.se ; it is very necessary that I should state 



