IV] ORTHORRHAPHA NEMATOCERA 33 



Synopsis of the Families of Orthorrhapha Nematocera 1 . 



Body and wings thickly covered with hairs; flies resembling moths 



(Fig. 20) =PSYCHODID;E. 



L Flies not resembling moths =2. 



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



2 -4 veins (Fig. 10) =Blepharocerida 2 . 



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



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



3 < usually with a discal cell = Tipulidce. 



L Scutum without a transverse suture = 4. 



f Wings with a discal cell (Fig. 12) =Rhyphides. 



X Wings without a discal cell =5. 



r Antennae abnormal, apparently consisting of two segments and a 

 5 ^ terminal arista (Fig. 14) =Orphnephilid(e. 



L 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 with only three longitudinal 

 i veins (Fig. 13) =Cecidomyidce. 



' J Not abnormally delicate and fragile ; wings- usually with numerous 

 L veins. 8. 



g 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) =MycetophilidcB. 



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



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



10 \The costal vein stops at or near the tip of the wing (Fig. 17) = LI. 



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

 whorls of hairs =Chironomid& 3 . 



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



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

 broad =Simuliid(Z 3 . 



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. 



