112 WALKEll ON DIPTEEA OF A.UV ISLANDS. 



purple, base and fore part of the disk tawny ; legs blackish ; femora 

 testaceous, with black tips ; wings nearly limpid, with a slight lurid 

 tinge in the discal areolet, blackish along the costa, and with a 

 blackish oblique streak which extends from the costa along the pra;- 

 brachial transverse vein ; a blackish dot on the hind end of the discal 

 transverse vein ; veins black, discal transverse vein parted by about 

 one-fourth of its length from the border, and by a little more than 

 its length from the prsebrachial transverse which is very oblique; alulae 

 white ; halteres testaceous, with black knobs. Length of the body 

 5 lines ; of the wings 9 lines. 



124. Lamprogaster scuTELLARis, n. s. Mas. Subcinereo-nigra ; 

 oculis albido submarginatis ; thorace vittis tribus cinereis, vittis duabus 

 lateralibus, scutelli subquadrati margine, tibiis interraediis tarsisque 

 albidis ; alis nigricantibus, fasciis duabus integris duabusque maculari- 

 bus incompletis albidis. 



Male. Black, with a slight cinereous tinge ; eyes partly bordered 

 with whitish ; third joint of the antennae elongate-conical ; arista 

 plumose, the bristles few; thorax with three indistinct cinereous 

 stripes, and with two whitish lateral stripes ; scutellum nearly qua- 

 drate, with a whitish border ; middle tibiae, knees and tarsi whitish, 

 the latter with black tips ; wings blackish, whitish at the base, and 

 with four whitish bands, first and third bands entire, second and 

 fourth macular, very irregular and incomplete ; veins black ; discal 

 transverse vein straight, parted by about one-fourth of its length 

 from the border, and by hardly more than its length from the prae- 

 brachial transverse. Length of the body 2 lines; of the wings 

 4 lines. 



This species has some resemblance to the genus Platy stoma, and differs 

 rather from the characters of Lamprogaster ; it and the two following 

 species, which are still more aberrant, will probably be considered as 

 three new genera. 



125. Lamprogaster CELYPHOiDES, n. s. Mas et Foem. Atra,nitens, 

 brevis, lata ; capite, antennis pedibusque testaceis ; abdomine nigro- 

 cyaneo ; alis limpidis, strigis transversis subcostalibus fuscescentibus. 



Male and Female. Deep black, shining, short, broad. Head testaceous, 

 face transverse ; antennae testaceous, third joint elongate-conical ; 

 arista bare ; abdomen blackish blue, second segment very large, third 

 and following not visible; legs testaceous; wings limpid, with four 

 transverse pale brown subcostal streaks ; discal transverse vein parted 

 by less than half its length from the border, and by less than its 

 length from the flexure of the praebrachial ; halteres testaceous. 

 Length of the body 2-2^ lines ; of the wings 4^ lines. 



126. Lamprogaster tetyroides, n. s. Mas. Atra, nitens, bre- 

 vissima, latissima ; capite transverso, subruguloso ; thorace scitissime 

 punctato ; abdomine cyaneo ; tarsis flavis ; alis nigris albido punctatis 

 apud marginem posticum obscure cinereis. 



