Fig. 14:21. Tendipedinoe adults, a, Tendipes plumosus (L.), 

 rsal view of head; b,c, anterior end of thorax, dorsal view, 

 owing shape of pronotum: b, Crypfochironomus; c, Glypto- 

 ndipes. d-f. Apex of left front tibia showing armature: d, 

 ;eudochironomus; e, Tendipes; f, Polypedilum. g, Polypedilum, 

 lie genitalia, dorsal view, with parts labeled; h-j, apex of left 

 id tibia, showing combs and spines: h, Pseudochironomus; i, 

 mytarsus (Stictochironomus); j, Tendipes. k,l. Last tarsal 

 gment, ventral view, showing pulvilli: k, Tendipes; I, Para- 

 idipes (Townes, 1945). 



i. Flagellum of male antenna with 11 segments; middle 

 tibia usually with 2 spines on the combs (1 on each 

 comb) (fig. 14:21A); apex of front tibia on inner side 

 with a low rounded scale which is not distinctly pro- 

 jecting (fig. 14:21/) 34 



Flagellum of male with 13 segments; middle tibia with 

 a single spine on the combs (fig. 14:2 li), or, if 2 spines 

 are present, then the apex of the front tibia with a 

 distinctly projecting subtriangular spine or scale (fig. 

 14:21o-e) 38 



. Pronotum, as seen from above, completely interrupted 

 in the middle, the 2 lateral halves distinctly separated 



(fig. 14:21c) 35 



Pronotum not interrupted in the middle, though usually 

 distinctly notched (fig. 14:216) 36 



. Median notch of pronotum narrow, not so broad as deep; 

 superior appendage of male genitalia broad and with 

 numerous bristles; anal point of genitalia very broad 



X enochironomus Kieffer 



Median notch of pronotum broadly V-shaped, broader 

 than deep, and often about 0.3 times as broad as 

 mesonotum (fig. 14:21c), superior appendage of male 

 genitalia horn-shaped, with not more than 1 bristle 



beyond the base; anal point of genitalia narrow 



Glyptotendipes Kieffer 



. Inferior appendage of male genitalia large, longer than 

 the superior appendage and with many bristles (fig. 



409 

 Wirth and Stone: Diptera 



14:206); basistyle and dististyle not ankylosed; front 

 usually with a pair of tubercles at its center (fig. 

 14:21a) Tendipes Meigen 



— Inferior appendage of male genitalia absent or very 

 small, usually smaller than the superior appendage, 

 with few or no bristles; basistyle and dististyle anky- 

 losed; frons usually without tubercles 37 



37. Inferior appendage of male genitalia with 1 or more 

 apical bristles; frons often with a pair of tubercles 

 near its center Cryptochironomus Kieffe 



— Inferior appendage of male genitalia absent, or, whei 

 present, without bristles (though with numerous micro 

 trichia); frons without tubercles . . . Harnischia Kieffer 



38. Pulvilli vestigial, not visible except in slide mounts 

 (fig. 14:210 39 



— Pulvilli well developed, about 1/2 as long as the claws 

 (fig. 14:2U) 41 



39. Fore tibia with an apical spine which with its broader 

 base is about 1.2 times as long as the tibial diameter; 

 apical segment of male flagellum less than 1/2 as long 

 as the combined length of remaining segments; squama 

 without a fringe of hairs Kribioxenus Kieffer 



— Fore tibia with an apical spine which with its broader 

 base is not more than 0.6 times as long as the tibial 

 diameter, or without a spine; apical segment of malt 

 flagellum longer than 0.7 times the combined length of 

 remaining segments; squama often with a fringe of 

 hairs 40 



40. Fore tibia with an apical spine; middle tibia usually 

 with 2 spines on the combs (one on each comb); squama 

 often with a marginal fringe of hairs; male genitalia 

 with a ventral pair of appendages . J'aratendipes Kieffer 



-=- Fore tibia without an apical spine; middle tibia with a 

 single spine on the combs; squama without a marginal 

 fringe of hairs; male genitalia without a ventral pair of 

 appendages Apedilum Townes 



4 1. Squama without a marginal fringe of hairs 



Lauterb orniella Bause 



— Squama with a marginal fringe of long hairs 42 



42. Both combs of middle and hind tibiae triangular in 

 shape, widely separated at the base, and each with an 

 apical spine (fig. 14:21/i); apex of front tibia with a 

 black ventral triangular spur (fig. 14:2 Id); pronotum 

 wide and with a broad deep notch at its center 



Pseudochironomus Malloch 



— Both combs of middle and hind tibiae neither triangular 

 in shape nor widely separated (fig. 14:21i,7); apex of 

 front tibia without a spur, but usually with a spine or 

 scale on the inner side (fig. 14:21/) 43 



43. Mesonotum without a median longitudinal row of hairs; 

 apex of fore tibia truncate, without a scale or spine; 

 fore femur of male with a patch of backward-directed 

 hairs at its apical 4th on the inner side 



MicTotendipes Kieffer 



— Mesonotum with a double median longitudinal row of 

 hairs; apex of fore tibia with a rounded or mucronate 

 scale (fig. 14:21/); fore femur of male without a patch 

 of backward-directed hairs 44 



44. Mesonotum extending far forward beyond the pronotum; 



middle tibia with a spine on each comb 



Stenochironomus Kieffer 



— Mesonotum extending moderately or not at all beyond 

 the pronotum; middle tibia with a spine on the inner 

 comb but rarely on the outer comb (fig. 14:21t) 45 



45. Pronotum in the middle projecting forward from the most 

 anterior point on the mesonotum, slightly broader at 

 the middle than at the side; hind tibia with a spine on 



the outer comb, the inner comb unarmed 



Omisus Townes 



— Pronotum not or scarcely reaching as far forward as 

 the most anterior point on the mesonotum, distinctly 

 narrower at the middle than at the side 46 



46. Base of 8th tergite and sternite of male triangularly 

 produced; male dististyle with long bristles on the 

 inner side (fig. 14:21tf); fore tibia of both sexes with 

 a pointed scale ending in a conspicuous spine (fig 

 14:21/); outer comb of hind tibia with a spine, the 



