XII. ANNALES MUSEI NATION ALIS HUNGAEICL 1914. 



FORMOSAN AGROMYZID^. 



By J. E. Malloch. 



(Plates IX -X.) 



The material upon which the present paper is leased was collected in 

 Formosa l;)y Mr. Sauter and is now de])osited in the Hungarian National 

 Museum in Budapest. 



The most striking feature about the material is the very large number of 

 species included in it, which belong to the group with black halteres, and 

 the comparative scarcity of other forms. The species belonging to the group 

 most numerously represented in this material are very similar in general 

 appearance to those which occur in America as gall makers, or as root 

 or stem miners. The absence of any species in the genus Agromijza, with the 

 costa carried only to the end of the third vein, is also a feature, though 

 this is probably due to the fact, that this group is, as elsewhere, rather less 

 numerously represented than the others. 



While many of the Agromyza species included in this paper have 

 much the habitus of some of those occurring in America and Europe, I have 

 failed to identify satisfactorily any form but fusilla Meigbn, which is 

 possibly cosmopolitan and longij)ennis Loew. In the species variiJiaUerafa, 

 we find a parallel to maculosa Malloch in the peculiar bicolored halteres, 

 but there are many good characters Ijy means of which they may l)e se- 

 parated. 



There is no indication on any of the material as to the habits of the 

 species. 



MILICHINAE. 



Pseudorhicnoessa, nov. gen. 



This genus maj^ be separated from Blticnoessa by the following cha- 

 racters. The orbits have one strong backwardly-directed bristle at about 

 the transverse line of the anterior ocellus, one strong outwardlj'-directed 

 bristle much below this one, and one or two, much shorter bristles, between 

 this point and the base of the antenng^ ; the cruciate bristles on the center 

 of the frons are represented by 2 or 3 pairs ; the post-vertical bristles are 

 strong and cruciate, otherwise the head is much as in JRhicnoessa. Thorax 



