78 



Transactions. — Zoology. 



Ccenosia algivora, sp. nov. 



Female. — Vertex tawny ; face yellowish-white, with yellow 

 reflections. Antennse piceous. Thorax pale yellowish-grey, 

 with indistinct longitudinal dark bands. Abdomen pale 

 yellowish-grey. A large rather darker triangular mark 

 covers the centres of the second and third segments, its 

 broad base being on the posterior border of the latter 

 segment. The fourth segment has three indistinct dark 

 spots ; the fifth segment is irregularly marked. Legs dark- 

 grey. Halteres brown. Squamae white. Wings pellucid, 

 the veins piceous. Length, 6 mm. 



Hab. Christchurch (F. W. H.) ; on the sea-shore. 



The distance between the cross-veins is about one and a 

 quarter times the length of the posterior cross-vein. The 

 distance of the latter from the margin is less than half its 

 length. The chief cross-vein is just beyond the end of the 

 first longitudinal. 



Division II. MUSCIDEA ACALYPTBAT^. 

 Squamae absent. 



Key to the New Zealand Families. 



First joint of the posterior tarsi longer than the seoond. 



Auxiliary vein more or less separated from the first 



longitudinal. 



Oral vibrissas present. 



Costa with distant long bristles 

 Costa without distant long bristles. 

 Third joint of the antennas oblong 

 Third joint of the antennae round 

 Oral vibrissas absent. 

 Basal cells large. 



Tibias with a preapical bristle 

 Basal cells small. 



Tibias with a preapical bristle 

 Tibias without a preapical bristle 

 Auxiliary vein completely united to the first longi- 

 tudinal. 

 Basal cells complete, large .. 

 Basal oells omplete, small 

 Basal cells incomplete. 

 Mouth large 

 Mouth of ordinary size. 



Oral vibrissas present; claws very small 

 Oral vibrissas absent; claws of ordinary 

 size 

 First joint of the posterior tarsi shorter than the second 



Helomyzidci'. 



CordyluridcE. 

 Phycodromidce . 



Sciomyzidce. 



Sapromyzida:. 

 Opomyzidce. 



Piophilidw. 

 Agromyzidce. 



EpliydrinidcE. 



Drosophilidce. 



Oscinidcs. 

 Borboridce. 



Family CORDYLUEID^. 



" Neuration of the wings complete; both posterior basal 

 cells of considerable size ; auxiliary vein well separated from 

 the first longitudinal ; first longitudinal bare. Whole lateral 



