222 C. R. Osten Sachen: Diptera 



in close contact, with the first; ist ending rather indistinct. The first 

 vein ends nearly opposite the posterior crossvein; the second soon after 

 it; the bifurcation of second and third takes place about the middle 

 of the length of the wing; anterior crossvein very short; second basal 



Naupoda platessa. 



cell unusually broad änd long, reaching beyond the middle of the wing; 

 as a consequence, the discal cell is shortened and nearly square; anal 

 cell comparatively long although shorter than the second basal; cut ofF 

 Square at the end; alula large. The wings are not expanded horizon- 

 tally, their distal half being somewhat bent (as in Stegana); the figure, 

 represents the outline of the venation only. 



The name Naupoda means inhabitant of an Island. 

 Nawpoda has many points in common with Gorgopis Gerst. ; 

 (Stett. Ent. Z. 1860, p. 180) only the head of tlie latter is much 

 broader, the antennae distant at the base etc.; otherwise the structure 

 of the head and of the abdomen, as rendered in Dr. Gerstaecker's 

 excellent description, agree remarkably well witli Naupoda. Gor- 

 gopis does not have the enormous second basal cell and small discal 

 cell of Naupoda; but G. hucepliala and N. platessa have nearly 

 the same coloring (black, with yellowish head and legs); the eyes of 

 the former are described by Doleschall (Zygaenula paradoxa, Derde 

 Bijdr. p. 46) as ,,green with nearly concentric red rings"; the eyes of 

 the latter are green with purple stripes. 



Gorgopis, according to Loew's supposition belongs to the Ulidina 

 (Monogr. N. A. Dipt. III, p. 65). But the Ulidina, in Loew's system, 

 have the first longitudinal vein glabrous, while Naupoda and probably 

 also Gorgopis have it pubescent; the Ulidina have the anal cell drawn 

 out in a point; (1. c. p. 64), which Naupoda and Gorgopis have not. 

 Moreover, Gorgopis, as Gerstaecker finds , and apparently with. good 

 reason, is related to Pterogenia Bigot and the latter, it seems to me, 

 may be better placed among the Platystomina. The fauna of the Ar- 

 chipelago seems to abound in forms, related to these, although generi- 

 cally distinct. Thus Gerstaecker himself acknowledges that his second 

 species of Gorgopis, G. cristiventris, is only provisionally united with 

 the first. Mr. Bigot's Pterogenia dayak appears to be generically 

 distinct from P. alhitarsis. Rondani's three genera (Elachigaster, 



