IV] ORTHORRHAPHA NEMATOCERA 33 



Synopsis of the Families of Orthorrhapha Nematocera}. 



rBody and wings thickly covered with hairs; flies resembling moths 



1 ■{ (Fig. 20) =PSYCHODID^. 



L Flies not resembling moths = 2 . 



r Wings with a network of fine vein-like creases besides the ordinary 



2 < veins (Fig. 10) =BlepharoceridcB^. 



I Wings without any additional network of vein-like creases =3. 



r Scutum usually with a V-shaped transverse suture (Fig. 11); wings 



3 <. usually with a discal cell = Tipulida. 



L Scutum without a transverse suture =4. 



/Wings with a discal ceil (Fig. 12) =RhyphidcB. 



\ Wings without a discal cell =5. 



r Antennae abnormal, apparently consisting of two segments and a 

 5 < terminal arista (Fig. 14) =OrphnephilidfB, 



I Antennae normally nematocerous =6. 



r Posterior edge of wing fringed with scales (Fig 25) =Culicid^. 

 \ Posterior edge of wing not fringed with scales =7. 



r Minute fragile midges; wings commonly v«rith only three longitudmal 

 J veins (Fig. 13) —CecidomyidcB. 



^ j Not abnormally delicate and fragile ; wings usually with numerous 

 L veins. =8. 



o r Ocelli present (Fig. 16, oc) =9. 



\ Ocelli absent =10. 



r Coxae elongate ; antennae usually elongate ; all the tibiae end in spurs 

 9 \ (Fig. 15) = Mycetophilidce . 



L Coxae short; antennae usually shorter than thorax =BihinnidcB. 



/The costal vein extends all round the wing =Dixid<s. 



^° iThe costal vein stops at or near the tip of the wing (Fig. 17) =11. 



^Gnat-like flies with long slender legs; antennae filiform, often with 

 whorls of hairs = Chironomido!^ . 



II J Thick-set flies with stout legs ; antennae stout and stiff, hardly longer 

 I than the head, and never having whorls of hairs ; wings remarkably 



I broad = Simtiliiddi^ . 



1 From Alcock's Entomology for Medical Officers, p. 46. 



■^ Some of the females belonging to Curupira have been suspected of blood- 

 sucking habits. 



3 Signifies that some of the members of these families are known to suck 

 blood. 



H. B. F. 



