The Mouth-parfc of the Ncmocera, etc. By W. Wesche. 21) 



Group 1. — All parts distinguishable, except the labial palpi, 

 which are aborted. 



Simulidae. (Type S. reptans L.) 

 Culicidae, the females only. 

 Tabanidae, „ „ „ 



Asilidae. 



Group 2. — The mandibles are fused into the labium, and the 

 labial palpi are aborted. 



(a) Raptorial, or bloodsucking. 



Empidae, with exceptions. 



Leptidae. (Type L. scolopacca L.) 



The genus Ceratopogon of the Chironomida3. 



(I) Suctorial. 



Mycetophilidae. 



Psychodidse. 



Culicidae, the males only and the genus Corethra. 



Ehyphidse. (Type R. fencstralis Scop.) 



Bombylidae. 



Syrphidoe. 



Group 3. — The mandibles are fused into the labium, the 

 laciniae and galas of the maxillae and the labial palpi are aborted. 



Cecidomyidae. 



Chironomidae, except the genus Ceratopogon. (Type Ch. 



pilumosus L.) 

 Tipulidae. 

 Stratiomidae. 

 Conopodae. 



Group 4. — The mandibles are fused into the labium ; all parts 

 of the maxillae except the stipites and cardines are aborted ; the 

 palpi present are labial, the trachea? of the paraglossae (labella) are 

 only moderately developed. 



Bibionidae. (Type B. hortulanus L.) 



Dolichopidae. 



Phoridae. 



Group 5. — The mandibles and other parts as in Group 4, but 

 having the tracheae well developed. 



(a) With remnants of maxillary palpi. 

 «• Some Tachinidae. 



Some Muscida?. (Type M. domestica L.) 



Some Anthomyidae. 



