ART. 6 NOTES ON ORIENTAL. SAPROMYZID FLIES MALLOCH 33 



Type.—C^t. No. 40399, U.S.N.M. Tyj)e and one paratype, Shin 

 Kai Si, Mount Omei, Szechuen, China, 4,000 feet, September 10, 1922 

 (D. C.Graham). 



This species is readily distinguished from others which have the 

 wings marked by the bivittate appearance of the dorsum of abdomen. 



Doctor Frey records no species of this genus in his paper but there 

 may be many in the Philippines as they are as a general run much 

 smaller and less conspicuous than the species of the better represented 

 genus Eomoneura, and are not so likely to be found in general 

 collections. 



Genus TRIGONOMETOPUS Meigen 



There have been several species of this genus described from the 

 Orient, or at least they have been placed in this genus, and two of 

 these species described from the Philippines are now before me. 

 Doctor Frey recorded these two species also but did not describe any 

 new species, though he described a new genus, Hendelimyza^ which he 

 placed next to T rig onomet opus. He makes no mention of the pres- 

 ence or absence of the posthumeral bristle so that it is not possible 

 to make absolutely certain of the identity of his genus. In describing 

 Hendelimyza Doctor Frey remarks that it is strange that the genus 

 Sap7'omyza, which is common in the Palearctic and Nearctic regions, 

 and appears to be absent from the Oriental region, should be so well 

 represented in the Australian region, and suggests that some of the 

 numerous species of Sapromyza which I have described from the 

 latter region may belong to Hendelimyza or an allied genus. If his 

 genus Hendelimyza is no closer to Trigonometopus than any one of 

 the species described by me from Australia I can not understand 

 why he placed it in his key next to that genus. In fact I should be 

 inclined to consider it merely a Sapromyza. If one gives too much 

 weight to variations in the shape of the head, and the chaetotaxy of 

 the thorax, in this family there will be no end to the number of 

 genera erected, with the result that the identification of species will 

 be absolutely impossible. 



I present below a key to the species of Trigonometopus known to 

 me from the Orient. 



KEY TO THE SPECIES 



1. Cheek with a series of hairs along middle which extends upward on para- 



facial almost as far as do the marginal hairs (Luzonomyza, new subgenus). 



bakeri Bezzi. 

 Cheek without hairs on middle 2. 



2. Thorax with the dorsocentral bristles arranged 1+2. 



Neotrigonometopus, new subgenus. 

 Thorax with the dorsocentral bristles arranged 0+3 (Subgenus Trigo- 



nemetopus Meigen) 3. 



2609—29 3 



