OK NEW ZEALAND. 353 



642. S. tuber CUliCOStatum, White (Opatntm) : Voy.Er.Tcn:, 

 Ins., p. II. Ficcous, covered with minute obscure-testaceous scales. 

 Head sub-quadrate, coarsely punctured and squamose. Prothorax with 

 indistinct sculpture, which is rendered quite obsolete by its covering of 

 scales and sponge-like matter. The elytra bear six more or less distinct 

 longitudinal costaj, all of which, except the two sutural, have five or six 

 rounded tubercles, and many minute granular elevations. 



As the species does not belong to Opatnnn, I have placed it with 

 Mr. Pascoe's Syrphetodes, to which it is nearly allied. Mr. F. Bates 

 having stated that he left this species to be dealt with by M. Miedel, of 

 Liege, who may probably have given it a new generic name, I shall 

 merely add such a description of its form and chief structural characters 

 as will enable it to be identified. 



Antcnnce about as long as head and thorax, inserted in front of but 

 quite distinct from the eyes ; they are eleven-jointed, their basal joint 

 stout, partially concealed by the antennal orbits ; second short ; third 

 elongate, rather longer than fourth and fifth conjointly ; joints four to 

 six sub-cylindric, each a little longer than the immediately preceding 

 one; joints seven to ten are submoniliform, and each a little larger than 

 its predecessor; eleventh large, rounded. Palpi (maxillary) with a large 

 subtriangular terminal joint. Eyes transverse, somewhat encroached 

 upon by the antennary orbits, which are large, dilated, and curvedly 

 prolonged anteriorly. Tibiae nearly straight, armed at apex with two 

 minute spines ; the anterior tarsi moderately slender, the fifth joint 

 about as long as the three basal ones together, the penultimate small, 

 sub-bilobed ; the posterior are four-jointed, and sub-filiform. Coxce 

 nearly equidistant, the front pair separated by a raised prosternal lamina. 

 Epipleurcc very broad, coarsely sculptured, each near the base nearly as 

 wide as the mesosternum, but narrowed posteriorly. 



The prothorax is transverse, nearly as wide as the elytra, its sides 

 explanated and reflexed, slightly rounded behind, and curvedly nar- 

 rowed anteriorly ; the apex is deeply emarginated, so that the front 

 angles become prominent and acute ; the disc is transversely convex, 

 and, owing to the reflexed margins, the space between is very concave. 

 The elytra are sub-oblong, the sides being nearly parallel to beyond the 

 middle and from thence rounded to the apex. 



Length, 6 lines. 



The above description corresponds with a specimen which had been 

 sent to me by Mr. C. M. Wakefield. 



643. S. decoratus, u.s. Piceous, opaque, clothed with fine fer- 

 ruginous scales; these latter are very dense along the clytral suture near 

 the apex, but leave quite nude a large concave conspicuous space on 

 each side of the posterior declivity ; antennre red, setose, their three 

 terminal joints covered with very fine yellow pubescence ; labrum, 

 palpi, and tarsi red ; legs squamose. 



Prothorax transverse, tri-sinuate in front, the anterior angles pro- 

 longed to the eyes ; its sides are obtusely dilated in the middle, 

 scarcely curvedly narrowed anteriorly and somewhat sinuously behind, 

 with rectangular posterior angles resting on the base of the elytra ; its 



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