18 NOTES ON SOME AUSTRALIAN SYRPHIDAE (DIPTERA), 



ther obscure stripe at about the end of the transverse suture, reaching the apex of the 

 thorax. The whole dorsal surface of the thorax is uniformly covered with a 

 vestiture of rather long thin yellowish hairs, and the anterior border, together 

 with the whole area between the obscure stripes, have in addition to the hairs 

 a yellowish tomentuni. Ventrally the thorax is brownish, but somewhat stained 

 with reddish, and is without conspicuous hairs. The scutellum is shining brown, 

 with a similar vestiture to that of the thorax. 



The abdomen is somewhat elongate and widest on the third segment. Its 

 length is less than three times the width. There are five conspicuous dorsal seg- 

 ments, the fifth of which is rounded, curving to the underside, and contains the 

 genitalia situated close to the last, apparently the third, ventral segment. The 

 colour of the abdomen is shining brown, covered with pubescence which is longer 

 on the under side; the fifth segment is dull and has the pubescence denser. 



The anterior and middle legs are simple; the posterior femora are swollen 

 and the posterior tibiae are bowed. The legs carry soft short hairs, and are with- 

 out bristles. The coxae and femora are reddish brown, the tibiae and tarsi are 

 yellowish. The hairs on the legs are mostly of the same colour as that part ou 

 which they are situated but the femora bear some conspicuous black pubescencs 

 on the under side. 



The wings are brown along the anterior border, otherwise they are more or 

 less hyaline, and yellow at the base. The halteres are yellow. 

 Length. — Male, 15 mm. 



Hnb. — Tasmania; Hobart. 1st December, 1917. The holotype male is unique. 



Genus Deineches Walker. 



Deineches Walker, Ins. Saund. Dipt., 1852, p. 228. 



Note. — This gei.us was created by Walker for a large Australian species that 

 comes dose to the genus Criorrhina, from which it differs apparently only in the 

 veins (hat run parallel to the apical border of the wing; these veins merge into 

 each other in a more or less unbroken line in Deineches, whilst in Criorrhina 

 (hey are separated by a space, thus breaking the line. It is doubtful if this 

 character is sufficient to justify generic separation. 



Deineches nigrofulva Walker. 



PI. 1, fig. 3. 



Deineches nigrofulva Walker, Ins. Saund. Dipt., 1852, p. 228, PI. vi, fig. 7. 



Hab. — New South Kales; two specimens in the Macleay Museum and one 

 in the Australian Museum. 



Explanation op Plate I. 



Pig. 1. Chrysotoxum elongatum sp. now, male. 



2- n ,, , the head, seen laterally. 



3. The head of Deineches nigrofulva Walker, male, seen laterally. 



4. The head of Orthoprosopa grisem Walker, male, seen laterally. 



5. The head of Criorrhina spadix sp. now, male, seen laterally. 



6. The antennae of the same. 



7. The wing of the same. 



