BY FRAXK H. TAYLOR. 45 



Hah. Q.: Stradbroke Island (H. Hacker). 



A very distinct species on account of the frontal callus alone. 

 It is most nearly related to S. niger Ricardo, but is markedly 

 distinct. 



Type in the Queensland Museum. 



8ILVIUS HACKERI, Sp.u. 



9. Length, 155: width of head, 5 - 5; length of wing, 13; pro- 

 boscis, 4 mm. 



A large, blackish- brown species: antennae and palpi brownish: 

 legs reddish brown: abdomen with median grey, apical Hecks, 

 segmentations grey. 



Head: face and cheeks black, tomentum grey, pubescence 

 mainly black: grooves between face and cheeks deep; subcallus 

 shining chestnut-brown; front broad, parallel, tomentum dull 

 golden, tinged with brown, brighter anteriorly, pubescence 

 Wlack; frontal callus kite-shaped, constricted near the base of 

 middle third, dull reddish-brown, about half the width of front 

 at widest part; first two joints of antennae dark reddish-brown, 

 third black, base broad, concave laterally, pubescence black, 

 scanty ; palpi conspicuously long, second joint greyish-black, 

 apex black, truncate, base concave laterally ; proboscis long, 

 black; beard grey; eyes bare. 



Thorax chocolate -brown, with three brownish stripes, the 

 median one broad and half the length of thorax: tomentum grey; 

 shoulders pale reddish, pubescence black, long laterally, with grey 

 hairs beneath; scutellum dark reddish-brown, posterior pubes- 

 cence grey; pleurae pale reddish-brown, tomentum and pubescence 

 grey. 



Abdomen blackish-brown; second segment reddish-brown, grey 

 in profile, segmentations grey, median grey-haired, apical, tri- 

 angular Hecks on the first six segments, lateral borders of seg- 

 ments pale with pale hairs, more pronounced posteriorly; venter 

 pale on the sides, black in the middle, tomentum grey, pubescence 

 grey and black. 



Legs reddish-brown, tarsi darker, pubescence black, grey on 

 coxae. 



