Diptera 287 



hh. Antennae of six to fifteen segments, those of the male usually 

 plumose; legs frequently slender and wings narrow 



CHIRONOMID.S; 



i. Media forked (except in the European genus Brachypogori) ; 

 thorax without longitudinal fissure and not produced over 

 the head (except in four exotic genera) ; antennae usually 

 fourteen-jointed in both sexes; fore tibia with a simple 

 comb of setulae, hind tibia with two unequal combs, 



middle tibia without comb CERATOPOGONIN^: 



j. Thorax produced cap-like over the head, wing narrow 

 and very long. Jenkinsia, Macroptilum and Caly- 

 ptopogon, eastern hemisphere; Paryphoconus, Brazil, 

 jj. Thorax not produced over the head. 



k. Eyes pubescent, empodium well developed, or if short 

 then R 2 +3 distinct and crossvein-like or the 

 branches of R coalescent; r-m crossvein present; 

 fore femora not thickened; wing either with ap- 

 pressed hairs or with microscopic erect setulae 



Dasyhelea Kieff. 



kk. Eyes bare, or otherwise differing from the foregoing. 



I. Empodium well developed, nearly as long as the 



claws and with long hairs at the base; femora and 



fifth tarsal segments unarmed, i.e. without spines 



or stout setae; fourth tarsal segment cylindrical. 



m. Wing with erect and microscopic setuke. Widely 



distributed 



(=Atrichopogon) Ceratopogon Meig. 



mm. Wing with long and depressed hairs. Widely 



distributed Forcipomyia 



n. Hind metatarsus shorter or not longer than the 

 following (i.e. the second tarsal) segment 



Subgenus Prohelea Kieff 



nn. Hind metatarsus longer than the following 

 segment .... Subgenus Forcipomyia Meig. 



II. Empodium short, scarcely reaching the middle of 



the claws, or vestigial, 

 m. R-m crossvein wanting. 



n. Palpi four segmented; inferior fork of the media 



obliterated at the base. Australia 



Leptoconops Skuse 



nn. Palpi three-segmented. 



o. Legs spinulose, tarsal claws of the female 

 with a basal tooth or strong bristle, those 

 of the male unequal, the anterior with a 

 long sinuous tooth, the posterior with a 



short arcuate tooth. Italy 



Mycterotypus Noe* 



