Makshall. — Oa New Zealand Diptera. 249 



however, is very marked, though not constant enough to 

 constitute distuict species. In all other particulars but size 

 all my specimens are exactly identical ; the antennce, veins of 

 the wings, and other organs show no variation. I have not 

 been able to examine the palpi in any but a very few speci- 

 mens, but, so far as I have been able to ascertain, the structure 

 is constant. 



AH measurements given above are in inches. 



EXPLANATION OF PLATES. 

 Plate V. 

 Fig. 1. Miastor agricolcc, female. 

 Fig. 2. Cecidomyia destructor, male. The only object of this diagram is 



to illustrate the difference between this genus and Diplosis. 

 Fig. 3. Diplobis dubia, female. 

 Fig. 4. Epidosis magna, male. 

 Fig. 5. Campylomyza ordinaria, female. 



These figures were all drawn from dried specimens. Their chief 

 object is to illustrate the difference between the various genera to which 

 they belong. They should not be relied on for specific characters. 



Plate VI. 



Fig. 1. Lestremia nova-zealatidice, female. 

 Fig. 2. „ „ male. 



Fig. 3. Side view of Epidosis aurca (antennae broken). 

 Fig. 4. Head of Lestremia nov a; -zealandice: o, occiput ; e, compound eye; 

 /, frons ; g, ocelli ; a, antennee ; p, palpi. 



Plate VII. 



Fig. 1. Portion of antenna of Campylomyza. 



Fig. 2. Portion of antenna of male of Diplosis ivanganuiensis. 



Fig. 3. ^I-aXq ol Diplosis fragilis. 



Fig. 4. Diagram of ideal dipterous wing. 



Cells. 



A. First costal cell. 



B. Second costal cell. 



C. Third costal cell. 



D. Marginal cell. 



E. Submarginal cell. 



F. First posterior cell. 



G. Second posterior cell. 

 H. Third posterior cell. 



I. Discal cell. 

 K. First or large basal cell. 



L. Second basal cell, or anterior of the small basal cells. 

 M. Third basal cell, or posterior of the small basal cells. 

 N. Anal or axillary corner of the wing. 

 0. Alar appendage (alula). 



Veins. 



a. Transverse shoulder-vein. 



6. Auxiliary vein. 



e. First longitudinal vein. 



