NOTES ON FLIES OF THE GENUS PELECORHYNCHUS 



(TABANID^). 



15 V 



G. H. Hakdy, latu i)f the Tasmauian Museiun, Ilobait. 



(Plate ix.) 



This paper coiitaius a complete catalo<rue of refereuces to the 

 Australiau species of Pelecorhyiichus, the description of a uew species 

 and a key to those described. Thoracic markings are illustrated from 

 such type specimens as are available for stud3\ 



Over one hundred specimens have been examined, representing all 

 the known species, four of which, P. distinctus, Taylor, Z'. lillyardi, Taylor, 

 F. clai-ipeniiis, Ricardo, and 1'. deuqneti, sp. nov., ai'e only known from 

 the female. 



PelecorhijHchidi personalas, Walker (= P. iiKiciiJlpeiiiiix. Macquart), 

 seems to have been unrecognised in Australian collections and confused 

 with P. nitjripeyiuis, Ricardo, from Avhich it is distinguished by doubtful 

 chai^acters. Futui'e investigation will probably show tliese to be 

 variations of the same species. 



Key to the species of Pd.ecorliijticlnix. 



1. Abflomt'U with tomentiun covering the whole surface, not shiniu"^; 2. 



Abdomen bare, or almost bare, shining 12. 



2. Abdomen with transverse bands ; longitudinal stripes are sometimes also 



present 3. 



Abdomen with at least one longitudinal stripe and without transvei'se 

 bands 10. 



3. The lighter coloured bands are entire, without interruptions in the centre, and 



are sometimes obscure 4. 



The lighter coloured bands are interrupted, sometimes forming spots on each 

 side of the dorsal stripe G. 



4. Bands obscure, with tendencies to being interrupted on either side of centre, 



never centrally. Thorax with a pair of white stripes on anterior half. 

 Eyes separate in cf igiiiculus. 



Bands conspicuous 5. 



5. Spots on wings pale brown, pubescence on anterior part of sides of thorax 



blackish, hairs on base of cheeks yellow personatas. 



Spots on wings deep blackish brown and larger, pubescence on anterior part 

 of sides of thorax and hairs on base of cheeks reddish nigripeHuis. 



(). Eyes widely separated in cT, alidomen with a pair of spots on each segment 

 caused by one median and a ])air of lateral stripes confining the 

 interrupted lighter bands to more or less triangular areas — ynirabilis d . 



Eyes contiguous in S , abdomen with conspicuous bands interrupted in tin; 

 centre 7 . 



7. A white stripe on the black stripe of the thorax, wings spotted, abdomen 



without red hairs albolineatas. 



A white spot, sometimes absent, on the black stripe of the thorax 8. 



8. AVjdomen with red hairs, wings spotted eristaloides. 



Abdomen without red hairs, wings not spotted 9- 



