206 



INSECTS OF SAMOA. 



stripes on the scutellum. Legs as in T. samoaensis, but the femora are fuscous 

 except at the tips. Wings as shown in text-fig. 2. 



Upolu : Tuaefu, type and allotype, 16.ix.l923 (Swezey and "Wilder). 

 Type in the Bishop Museum. 



Homoneura van der Wulp. 



This is the predominant genus of the family in the Malayan region, and 

 apparently in Oceania also if one may judge from the material already described. 

 In Australia Sapromyza Fallen is the richest in species ; although many of the 

 forms are rather aberrant, it is not possible to distinguish them generically in a 

 satisfactory manner at this time. I have erected several subgenera of Homoneura 

 in the paper referred to above, and two of the segregates named therein are 

 represented in the Samoan material before me. 



Bezzi has described three Fijian species, which belong to a group in which 

 but one sternopleural and no intra-alar bristle is present, the anterior one of the 

 three pairs of dorsocentrals is presutural, and the mesonotum is metallic bluish 

 or greenish. This group is unrepresented in the Samoan material now before 

 me. All the other Fijian species included in Bezzi's key after the foregoing 

 three are said to have a distinct intra-alar bristle, and would therefore be assign- 

 able to the subgenus Minettioides Malloch, but none of them agrees with any 

 one of the species of this subgenus dealt with below. 



I have before me a male and female from Fiji (Viti Levu), which appear to 

 belong to H. ensifem Bezzi, but they are teneral and it is impossible to be certain 

 as to this. The female possesses a knife-like ovipositor, and in other respects 

 the species agrees very well with the description except that the specimens are 

 darker than described. The particular point, however, that I desire to mention 

 is that the specimens do not possess a well-developed intra-alar bristle as 

 required by Bezzi's key, and it is possible that an error has crept in here. Since 

 the species is not Samoan, I do not care to deal further with it here. 



It must be noted that Bezzi, in considering the length of the hairs on the 

 arista, takes the total extent from the tips of the hairs on the lower side to the 

 tips of those on the upper side, thus making any estimate he gives twice as 

 great as that given by me, since I consider only the length of the individual 

 hairs. 



I present below a key to the Samoan species, only two of which fall within 

 any of the segregates in Bezzi's key. 



