436 Miss G. Ricardo — A Revision of 



Cerdistus, Loew. 



Linn. Eut. iv. p. 74 (^1849). 



Schiuer lecorded the one species of this genus from 



Australia, and another species of Walker is added here, so 



f^. , , .that two species are recorded from this reeion as follows : — 



f^^^^ /. ^Cerdistus maricus, Walker, Dipt. Saund. i. p. 141 \_Asilus] (1851), et 

 L-^ — List Dipt. vii. Suppl. 3, p. 737 [Asihis] (1855). 



Cerdistus sydneyensis, Scliiuer, ' Novara ' Reise, Dipt. p. 187 (1868). 



Cerdistus maricus, Walker. 



This small species appears to belong to the above genus, 

 but does not answer to the description of Schiner's species. 



Type ( c? ) from Port Philip [Hunter) and another female 

 from Queensland {Dr. T. L. Bancroft). 



Black. Abdomen with grey segmentations. Legs black, 

 the tibiae and first joint of tarsi obscurely reddish yellow, 

 the hind legs more distinctly so. Moustache black above, 

 white below. Wings hyaline. 



Length L2 and 14 mm. 



Face blackish, with white tomentum at sides ; in tl)e 

 fresh female the face is more brownish, the tubercle small, 

 the moustache not reaching beyond it, composed of stout 

 black bristles above and long, soft, white hairs below, in the 

 type the black bristles are not so apparent. Beard white. 

 Antennae black ; the first two joints with black pubescence, 

 the style of the third long. Head deeply excised behind. 

 Thorax black, with white tomentose stripes and sides ; two 

 black bristles situated on side at suture, one above the other, 

 and weak yellowish ones behind ; on dorsum short black hairs 

 and white ones posteriorly. Scutellum black, with wdiitish 

 tomentum and two weak yellow long bristles. Abdomen 

 black, Avith whitish-grey segmentations^ and with white 

 hairs at the sides ; short black hairs on anterior border of 

 segmentations, and at sides of segmentations a few black 

 hairs. Ovipositor about as long as the last two segments^ 

 brown and shining. Legs with black bristles ; on the hind 

 tibise a few white ones intermixed ; femora with short white 

 hairs below. Wings hyaline, the small transverse vein 

 beyond the middle of the discal cell ; the fourth posterior 

 and anal cells closed, the former with a short stalk ; veins 

 black. 



Cerdistus sijdneyensis, Schiner. - ^'crdc^u^/x^iX'*^*^^^^-,^ ,„i«. /f&4*^ 

 Described as black. Abdomen with grey segmentations. 



