^02 



INSECTS OF SAMOA. 



Trypaneoides Tonnoir and Malloch. 



In a recently published revision of the Oriental Sapromyzidae,* I have 

 dealt with the species of this genus, with the exception of one which occurs in 

 Australia, and another which is found in New Zealand. None of the three 

 Pijian species assigned by Bezzi to Drosomyia agree with any of those in my 

 key. All three of them run to No. 7 in that key, and all have but one clear 

 spot on the costa between the ends of the second and third veins, being thus 

 distinguished from T. hyalipuncta Malloch. In Sapro?yiyza leucostica Bezzi 

 there is but one spot, or two connected spots, in the apex of the first posterior 

 cell, a character which readily distinguishes this species from all the others, in 

 which there are eight or more such spots in that cell ; in S. cirrhicauda Bezzi 

 there are about twelve clear spots in the first posterior cell, owing to those in 

 the apical half of the cell being divided by a dark line ; and in S. caniventris 

 Bezzi the spots in the same cell are all more or less connected by pale lines 

 extending between them on the central line of the cell. 



In the material from Samoa I find examples of one of the species described 

 by Bezzi, and of two others which are distinct from his. Below I present a 

 key for their differentiation. 



Key to the Species. 



1. Face densely covered with pale grey, with two complete, rather broad, dark 

 brown transverse bands, one a little above lower margin, the other 

 below bases of antennae ; longest hairs on arista about five times as 

 long as its basal diameter ; cheek without a dark mark near vibrissal 

 angle ; ultimate section of fourth wing vein very distinctly less than 

 twice as long as penultimate section ; large species, averaging over 

 4 mm. in length . . . . . . . . ... caniventris Bezzi. 



Face covered with grey dust, with at most a narrow, dark, transverse 

 band near lower margin, sometimes reduced to three dark spots, one 

 on each side, the other in centre ; hairs on arista not, or very slightly, 

 longer than its basal diameter ; ultimate section of fourth vein 

 twice as long as penultimate section ; smaller species, not over 3 mm. 

 in length . . . . . . . , . . . . ,, . .2 



* Cf. Malloch, J. R., " Notes on Some Oriental Sapromyzid Flies (Diptera), with Particular 

 Eeference to the Philippine Species " : No. 2751, Proc. U.S. Nat. Mus., Vol. 74, Art. 6, pp. 1-97, 

 Pis. 1-6, 1929. 



