236 Transactions. 



darker than tte preceding, bearing a shorter terminal style {d) ; face covered 

 with silvery tomentum, oral margin sm-rounded by long silvery hairs which 

 extend posteriorly toward the occiput ; proboscis {a) rigid, tapering to a 

 point which is bifid, directed downwards, about one and three-quarters 

 the length of the head, dark brown, shiny ; palpi (6) about as long as the 

 proboscis, club-shaped, silvery grey, bearing long silvery hairs. 



Thorax : pleurae brown, covered with silvery tomentum ; metapleurse with 

 a tuft of hair, dorsum brown, with two darker longitudinal stripes ; bristles 

 short anteriorly, but longer posteriorly ; a medium-sized bristle on each of 

 the alar frena near the wing-bases ; humeri silvery, as also are the hairs and 

 the margin of the dorsum ; scutellum silvery grey, with several medium- 

 sized marginal bristles ; halteres Ught brown. Wings tinged with gxey, 

 veins brown and faintly margined with brown, main vein grey toward the 

 base, a brown elongate spot at the junction of the first longitudinal with 

 the costa (fig. 1), fork of third longitudinal vein curved forward before meet- 

 ing the costa ; auxihary vein evanescent at the tip so as not to meet the 

 costa. Legs covered with weak bristles and silvery hairs, the posterior 

 pair being the longest ; coxae same colour as the pleurae, not elongate ; 

 femora, tibiae, and tarsi very dark, almost black in certain fights, covered 

 with grey tomentum and with silvery reflections, the posterior metatarsi 

 (a, fig. 4) and distal extremity of the femora [h) swollen ; pulvilli and ungues 

 distinct. 



Abdomen finear, grey, margins of segments with silvery hairs, longer 

 in the male, a system of black spots on each segment, a row existing 

 along the anterior margin together with two median pairs, one on each 

 side toward the margin (fig. 6). Genitalia of male (fig. 3) much swollen, 

 recurved dorsally, covered with long hairs, bearing two sets of shiny reddish- 

 brown claws (6) ; abdomen of female tapering to a dark point bearing a 

 clump of short bristles directed forward (fig. 5). 



Length of g and ? , 8 mm. ; of wing, 1\ mm. 



Hah. — Common during the summer on the sandhills of the sea-beach, 

 having been captured on Murdering Beach during January, and also on 

 Ocean Beach in the following month (1909). 



EXPLANATION OF PLATE XXX. 



Fig. L Plan of venation of the wing (magnified). 



Fig. 2. Side view of head : a, proboscis ; h, palpi ; e, f, 1st, 2nd antennal joints ; 



c, 3rd joint ; d, terminal style (magnified). 

 Fig. 3. Dorsal view of male genitalia, showing the claws (6) and abdominal segments (o) 



(magnified). 

 Fig. 4. Posterior leg of male, showing portion of femora (b) and swollen metatarsus (a) 



(magnified). 

 Fig. 5. Side view of the posterior abdominal segments of a female (magnified). 

 Fig. 6. Dorsal view of 6th abdominal segment, showing the arrangement of the spots 



(magnified). 



