NO. 2018. SYNOPSIS OF GENERA OF AGROMYZIDM—MALLOCH. 129 



The other terms used in descriptions are such as are used in most 

 works dealing with Diptera and require no further explanation. 



SYNOPTIC TABLE OF SUBFAMILIES IN AGROMYZID^. 



1 . Postvertical bristles distinctly divergent, always distinct ' 2 



Post vertical bristles not divergent, either directed straight backward, or cruciate, 



or indistinguishable 3. 



2. Outer cross vein always present and situated beyond inner cross vein. 



Agromyzin^. 

 Outer cross vein absent, or situated anterior to, or directly under inner. 



Phytomyzin^. 



3. Central stripe of frons with generally two rows of setulae, or if these are absent the 



anterior margin has several distinct setulae in a transverse row; vibrissa generally 



differentiated from marginal mouth bristles MtLiCHiNiE. 



Central stripe of frons l)are except for sometimes scattered short hairs, which are 

 not regularly arranged in two stripes, anterior margin without distinct setulse; 

 ocellar triangle seldom distinct (Cryptochxtum); vibrissa absent or rarely differ- 

 entiated from marginal mouth bristles Ochthiphilin^. 



SYNOPTIC TABLE OF GENERA IN AGKOMYZIN^. 



1. Mesopleura bare 2. 



Mesopleura with at least one strong bristle 3. 



2. Frons Ijuccate, the ocelli situated on a humplike protuberance in vertical line 



above the antennae (pi. 5, fig. 13) Traginops Coquillett. 



Frons normal in shape; ocelli situated well back toward vertex (pi. 5, fig. 15). 



Odinia Robineau-Desvoidy. 



3. Third antennal joint terminating in a thornlike point on upper side. 



Cerodontha Rondani. 

 Third antennal joint not terminating in a sharp point on upper side. 



Agromyza Fallen. 



These four genera are all that I consider belong to this subfamily. 

 The species which stand in the collection as Cacoxenus have cruciate 

 postvertical bristles, which excludes them from this subfamily. 



SYNOPTIC TABLE OF GENERA IN PHYTOMYZINiE. 



1. Outer cross vein absent Phytomyza Fallen. 



Outer cross vein present, but situated anterior to, or directly below, the inner cross 

 vein (pi. 4, fig. 4) Napomyza-7. d. Wulp. 



Some writers do not recognize the validity of Napomyza, but in 

 most cases it is ranked as distinct from Pliijtomijza. Paramyia Willis- 

 ton belongs to the Milichinse. 



SYNOPTIC TABLE OF GENERA IN OCHTHIPHlLtN^. 



1. Orbital bristles present 4. 



Orbital bristles absent 3_ 



2. Arista absent (pi. 4, fig. 5; pi. 6, fig. 29) Cryptochxtum Rondani. 



Arista present 3_ 



I Eemeromyia has the postvertical bristles slightly divergent in type, but they are very smaU, there 

 are two bristles on anterior margin of frons, and in other respects it has so much the habitus of the MUichinw 

 that I consider it really belongs to that subfamily. 



95278°— ProcN.M. vol.46— 13 9 



