254 ox THE JIALE GENITALIA OF SOJIE ROBBER-FLIES, 



containing black hairs on the two basal segments. The palpi are blaok with 

 lilack hairs and the proboscis is black. 



The thorax has a pair of black median stripes and between them there is a 

 slightly obscure yellowish line ; on each side a lateral stripe, interrupted anteriorly, 

 is separated from the median stripe by a bright yellow stripe; the lateral border 

 is bright yellow merging into the light greyish on the postalar callus. 



The thoracic bristles consist of a row of three presutural with one anterior 

 to these, three or four superalar, three or four postalar and about six dorso- 

 central. The scutellum is greyish, with about four, black, marginal bristles and 

 black pubescence. Ventrally the thorax is light yellowish, with the hairs and 

 bristles, including the metapleural and hypopleural, yellow or white. 



The abdomen, dorsally, is yellowish brown in colour and obscurely black 

 along the median line forming a broad obsolete stripe. The pubescence is mostly 

 black but yellowish laterally, with yellowish hairs and bristles. 



The forceps of the genitalia are black and large, set wide apart, and expo-se 

 the other parts of the genital organs; each branch of the upper forceps contains 

 a process issuing from the upper half at the apex and curves upwards ; the 

 whole surface is covered with l)lack pubescence and some conspicuous white pub- 

 escence; the lower forceps are black, with long whitish hairs which become bristly 

 at the apex; the black lamella is conspicuous and broad. 



The legs have their coxae unicoloured with the under side of the thorax. ;ind 

 contain long whitish hairs and bristles; the femora are red with a black stripe 

 on the anterior side; the tibiae are red with black at the apices; the tarsi are 

 black; the claws are red at the base and black at the apes; the pulvilli are yel- 

 low. The pubescence is mostly yellowish on the femora and tibiae, and black on 

 the tarsi. There are some long, black, bristly hairs on the anterior femora which 

 are spineless; the intermediate femora contain two rows of spines on the anterior 

 side, one ventral row and one row on the posterior side ; the posterior femora con- 

 tain two rows of spines on the anterior side and a few subapical spines. 



Length of male, 30 mm. 



Hab. — New South Wales : Hampton, near Rydal — one male specimen col- 

 lected by Dr. R. J. Tillyard during January, 1918. There is also a male speci- 

 men in the Macleay Museum, with the genitalia distorted, from Walcha; the label 

 indicates the month "November," but the year of ca^iture is not specified. 



AsiLUS FERRUGiXEiVENTRis Macquart. (Text-fig. 4.) 



Asilus ferrugineiventris, Macquart, Dipt. Exot., suppl. 4, 1850, p. O'J, PI. ix. fig. 1. 

 Asihis hyagnis. Walker, Ins. Saund. Dipt., 1851. p. 139; Walker, List Dipt. Brit. 

 Mus., vii., suppl. 3, 1855, pp. 730 and 739; Ricardo, Aim. ^fag. Nat. 

 Hist, (8), xi., 1913, p. 445. 



Sgnongmy. — The description of A. ferrugineiaextris Macquart conforms to 

 specimens of A. hyagnis Walker in all essential points. 



Stattis. — Although the synonymy is given here with the writer's convictions, 

 the identity of the species with A. hyagnis Walker is accepted upon the evidence 

 that Mr. Taylor sent to Miss Ricardo some specimens from a long series col- 

 lected in Queensland and these were identified as A. hyag)ii!i Walker. In conse- 

 quence, the specimens retained were labelled as such and were subse(]uently ex- 

 amined by the writer. The retained specimens belong to only one species and a 

 mah' was selected for inclusion in the collection of the Australian ^Museum. A 



