298 REVISION OP GENERA BELONGING TO DIPTERA BEACHYCERA OF AUSTRALIA, 



Genitalia: The genital organs do not show many external characters of 

 specific value. The species usually have simple upper and lower forceps in the 

 males, but one species has the upper forceps of the male genitalia bent down- 

 wards considerably at the apex. The females all l>ear the same number of 

 spines at the apex of the abdomen. 



Colour and colour j) a 1 1 e r n : The colour of species forms a very 

 inadequate determining factor but there are a few outstanding species that 

 differ in this respect from the rest. Also a few species appear to have a unique 

 colour pattern. 



Notes. — The above revision of this genus is included in this paper for the 

 purpose of showing that certain characters are of specific value, and it is to be 

 hoped that the remarks may be found useful when the type specimens, all of 

 which are in Europe, are examined. The revision is based upon abundant 

 material, as Osten-Sacken suggested should be done, but without the types it is 

 impossible to carry this revision beyond the point liere attained. 



Family THEREVIDAE. 



Notes. — In the "Thereviden der Indo-Australischen Region" Krober (1912) 

 has left the taxonomy of the genera, as far a.s Australia is concerned, in a con- 

 dition that cannot be considered satisfactory. 



In 1915, White revised the Therevidae of Tasmania, and pointed out that in 

 classifying the genera the form of tlie venation of the wing seemed to him to 

 be of great importance. 



An independent investigation into a large number of species of Therevidae 

 of Australia, including most of tlie known genera, ha-s led me to the same con- 

 clusion as that arrived at by White and, therefore, it is certain that the venation 

 will provide some characters of importance for the proper grouping of the 

 Australian genera. 



It is proposed here to divide the Australian Therevidiie into two groujjs 

 based upon the open and closed fourth posterior cells, a character sometimes 

 ignored in Krober's work. 



Group 1, containing species with the fourth posterior cell open, includes tlie 

 genera Belonalys, Taenogera, Ectinorrhynclius, Anabarrhynchus, Platycarenum, 

 and Psilncephala. 



Group 2, containing species with the fourth posterior cell dosed, includes the 

 genera Agapophytiiti, Phycu.t, Aeatopygia, Acupalpa, Lonchorh'ynchu.f, Oden- 

 hergia, Parapsilocepliala , Pfieudoloxocera. Acraspisa and Clesthentia. 



The genera Spatidipalpa and Eupsilocephala have not been recognised in 

 the collections examined, and from their descriptions the first contains species 

 with the fourth posterior w\\ closed and open, and in the second the character 

 is ignored. 



Genus B E I. N A I, r s Krober. 



Type, V. ohscura Krober. New South Wales. 



Note. — A primary character given by Krolier and upon whieli he has founded 

 the genus will be found at tlie ba.se of the disc.al cell. The two veins which 

 border this cell anteriorly and posteriorly radiate from a point, so that the base 

 of the discal cell forms an acute angle. A species of this genus, which is re- 

 presented by two specimens before me, shows that in one specimen the wing 

 character agrees with the above description, but in the other the venation is more 



