BY ARTHUR WHITE. 47 



white hindmargins, which are expanded at the sides ; fifth 

 and sixth white ; genitalia large, black. Legs with femora 

 •entirely black ; tibiae yellow, with black bristles, the apex 

 •and tarsi black. Wings with the costa conspicuously 

 inflated from the base to the stigma, which latter is more 

 distinctly marked than in most species of the genus ; the 

 wings are either hyaline, or have the veins slightly suf- 

 fused with brown ; veins brown. 



Female resembles the male very closely, and only dif- 

 fers in the more widely-separated eyes, and the longer 

 abdomen. 



This species may be easily distinguished by the shape 

 of the wings ; most species of Anabarrliynchus have the 

 costa slightly inflated, but in A. passu s the inflation is 

 •conspicuous. This feature is common to both sexes. 

 Another unique feature that this species presents is the 

 absence of the prescutellar bristles, which are present in 

 all the other Tasmanian species. 



A. passus is a spring species. The only other member 

 of the genus on the wing at the same time is> A. calceatus, 

 from which it may be distinguished at once by the black 

 femora, A. calceatus having the anterior femora partly, 

 and the middle and hind femora wholly, yellow. 



A. jiassus occurs somewhat sparingly; it may be found 

 either settled on the ground in sandy places, or else fre- 

 quenting stones in the beds of mountain streams. My 

 dates range from October 25 to November 9. 



In addition to the foregoing species Anaharrhynchus 

 ruf.pes, Macq., is doubtfully Tasmanian. It is described 

 as having the thorax grey, with three bla.ck stripes ; abdo- 

 men black with incisions and sides white ; femora and 

 tibiae yellow ; wings tinged with yellow. If it occurs in 

 'Tasmania it should be easy to recognize by the yellow 

 femora and black-striped thorax. 



25. Psilocephala, Zett. (Fig. 24). 



Slender species, having the front bare;, eyes joined in 

 male, widely separated in female, and wings with the 

 fourth posterior cell — in Australian species — always open. 



Head as broad as, or a little broader than, the thorax ; 

 front bare. Proboscis usually lying close against the face. 

 Antennae short, the first joint about three times the length 

 of the second, but shorter than the third. Eyes joined in 

 the male, but widely separated in the female. Thorax 

 bare, but with the thoracic bristles well developed, the 

 dorso-central being either complete or consisting of from 

 one to three pairs of prescutellar bristles. Abdomen nar- 



