DIPTERA 795 



Series I.— NEMOCERA* 



The Long-horned Orthorrhapha 



This series of families is termed the Nemocera from the fact that 

 in the more typical forms the antennae are elongate and slender ; but 

 in some families placed at the end of the series, the Anomalous Nemo- 

 cera, the antennse are shorter and less thread-like than in the more 

 typical forms. The antennae are composed of from six to thirty-nine 

 segments, usually from eight to sixteen. The palpi are pendulous 

 and consist of from one to five segments, usually of four. Except in 

 a few genera, cell ist A is not narrowed towards the margin of the 

 wing. In those cases where the radial sector is three-branched, it is 

 veins R4 and R5 that have coalesced ; in the Brachycera veins R2 and 

 R3 are the first to coalesce. 



SUBSERIES A. — THE TRUE NEMOCERA 



In this subseries the antennae are usually long and frequently bear 

 whorls of long hairs, especially in the males. The legs are long and 

 slender, and the abdomen is 

 usually long and slender. 



SUPERFAMILY TIPULOIDEA 



The Crane-flies 



The crane-flies are mosquito- 

 like in form ; but they are usually 

 very much larger than mosqui- 

 toes. The body is long and 

 slender, the wings narrow, and 

 the legs very long (Fig. 1004). 

 This family includes the larger 

 members of that series of families 

 in which the antennae are thread- 

 like, the Nemocera; but it also 

 includes some species that are not 

 larger than certain mosquitoes. 



Most crane-flies differ from all other Nemocera in that the trans- 

 verse suture of the mesonotum is V-shaped; but one small family 

 the Anisopidas, lack the V-shaped suture. 



This superfamily includes the four following families; these can 

 be separated by the characters indicated in the table of families 

 page 78 7. 



*Nem6cera: nema {vijfjLa), thread; ceras (Kipas), horn. 



Fig. 1004. — A crane-fly. 



