419 

 Wirth and Stone: Diptera 





Fig. 14:30. Clunioninae. a-h, Tethymyia aptena Wirth: a, male, lateral view; b, male head, 

 anterior view; c, larva, lateral view; e, larval torma; f, larval antenna; fi, larval labial plate; 

 d, male pupa in lateral view; g, last segment of pupa in dorsal view. /', Paraclunio trilobatus K., 

 front femur and tibia; j,k, Telmafogeton mocswaini Wirth: ;', female; lateral view; k, front tarsus 

 of male, fifth segment (Wirth, 1949). 





Tribe TENDIPEDINI (=CHIR0N0MINI) 



In striking contrast to the unorganized state of our 

 knowledge of the bulk of the North American tendi- 

 pedids, the Tendipedini have been thoroughly revised 

 in a recent publication by Townes (1945). Because 

 of their larger size and economic importance in 

 stream and lake biology, the members of the genus 

 Tendipes (=Chironomus) have become much better 

 known than the numerous species of smaller greenish 

 tendipedines, but the great variability of characters 

 of both adult and immature stages makes their classi- 

 fication extremely difficult. Members of this tribe 

 are most numerous in the weedy coves of larger 

 rivers and bays of lakes, although smaller streams 

 and ponds also produce numerous species. Most of 

 the species breed in beds of aquatic vegetation or in 

 bottom mud of water less than ten feet deep, and 

 comparatively few species occur in the great pro- 

 fundal depths. 



Genus P 'seudochironomus Malloch 



(Figs. U:21d,h\ 14:32i-Z,o,p) 



This and following genera through Stenochironomus 

 form a natural group which is well set off from the 

 remaining "Chironomus" of authors, and has been 

 termed the "Chironomariae connectentes" by Euro- 

 pean workers. They share in the larva, with few 

 exceptions, the characters of six-segmented antennae 

 (figs. 14:32^7rc; 14:33a,;') and an even number of labial 

 teeth (figs. 14:32r, s; 14:33c, i); in the pupa, the pro- 

 thoracic respiratory organs usually with two to twelve 

 branches (fig. 14:32J; 14:336,A); the adults with one 

 long spur on the hind tibia, or if with two short spurs, 

 the wings are banded or the tarsi lack pulvilli (fig. 

 14:212); the male with fourteen antennal segments. 

 The genus P seudochironomus is set off in an anom- 

 alous position from the other members of this group; 

 the larva by the nearly contiguous paralabial plates 



