WALKER ON DIPTEllA OE ATIUJ ISLANDS. Ill 



Subfam. Ortaltdes, Haliday. 

 Gen. Lamprogaster, Macg^. 



121. Lamprogaster auADRiLiNEA, n. s. Mas et Foem. Cyaneo- 

 viridis; capite pedibusque nigris; antennis piceis, basi rufis ; thorace 

 vittis quatuor albidis ; abdomine purpureo-cyaneo ; alis limpidis, litura 

 basali, fasciis duabiis (prima abbreviata, secuiida interrupta) strigaque 

 costali apicali nigris. 



Male and Female. Bluish green. Head black ; proboscis red at the 

 tip ; antennae piceous, red at the base ; thorax with two whitish stripes 

 on each side; abdomen purpHsh blue; legs black, tarsi with pale 

 tomentum towards the base ; wings hmpid, two black streaks, one 

 basal including a limpid dot, the other apical, first band oblique, 

 extending from the costa to the disk, second widely interrupted in 

 the middle, its hind part occupying the discal transverse vein ; veins 

 black, testaceous along the costa ; prajbrachial vein forming a slight 

 angle at its junction with the discal transverse, the latter parted by 

 not more than one-fourth of its length from the border, and by more 

 than its length from the pra^brachial transverse. Length of the body 

 3^-4^ lines; of the wings 7-9 lines. 



122. Lamprogaster marginifera, n. s. Fosm. Testacea; capite 

 maculis duabus fasciaque nigro-aeneis ; thoracis disco nigro-aeneo, vittis 

 tribus testaceis, vittis duabus lateralibus albidis, scutelli margine tes- 

 taceo; abdominis dorso nigro-aeneo; alis limpidis, fasciis plurimis fuscis. 



Female. Testaceous. Head with tw^o blackish aeneous spots on the 

 vertex, and with a blackish aeneous band in front ; mouth and an- 

 tennae tawny ; disk of the thorax blackish aeneous, with three testa- 

 ceous stripes which are united in front, the middle one slender, the 

 lateral pair united on the border of the scutellum, a whitish stripe on 

 each side ; abdomen blackish aeneous above ; wings limpid, with eight 

 or nine irregular brovna bands; veins black, testaceous along the costa; 

 discal transverse vein parted by much less than its length from the 

 border, and by about its length from the praebrachial transverse. 

 Length of the body 4 lines ; of the wings 9 lines. 



123. Lamprogaster DELECTANS,n. s. Fo2m. Ferruginea; capite tes- 

 taceo, postice albido, vertice luteo fasciis duabus nigris, vittis quatuor 

 anticis antennisque nigris; thorace vittis septem et metathoracis 

 fascia albidis ; abdomine cyaneo-viridi, basi discoque fulvis ; pedibus 

 nigricantibus, femoribus testaceis apice nigris; alis sublimpidis, costa, 

 striga obliqua subcostali guttaque marginali nigricantibus. 



Female. Ferruginous. Head testaceous, whitish behind; vertex lu- 

 teous, blackish in front and behind; fore part with four blackish 

 stripes; antennaj blackish; thorax with seven whitish stripes, the 

 middle one broad, the inner pair very slender, the second pair broad, 

 the third pair lateral ; abdomen bluish green, slightly varied with 



LINN. PROC. — ZOOLOGY. 8 



