PSYCHE. 



INTRODUCTION TO BRAUER AND VON BERGENSTAMM'S 



VORARBEITEN ZU EINER MONOGRAPHIE DER 



MUSCARIA SCHIZOMETOPA.— II. 



BY C. H. TYLER TOWNSEND. 



The Muscarta schizotnctopa are di- 

 vided first into two groups : the Antho- 

 myidae and Muscariae genuinae. The 

 first show the costal vein continued to 

 the end of the fourth longitudinal, and 

 usually have small tegulae ; the latter 

 have between the third and fourth long- 

 itudinal, where the apical crossvein is 

 lacking, only a membranous margin, 

 and usually the fourth longitudinal 

 before its end bent toward the third and 

 terminating close behind it, or at the 

 curve dividing into a posterior false 

 vein, or a true one, which runs toward 

 the edge, but seldom reaches it, and an 

 apical crossvein, which ends near the 

 third longitudinal, or even in it (first 

 posterior cell open, or petiolate) . 

 Rarely the apical crossvein is lacking 

 and the fourth longitudinal ends in the 

 posterior margin, or before reaching it 

 (Syllegoptera, Melia, Microtricha, 

 Thrixion, Gastrophilus). Tegulae gen- 

 erally large, rarely small. 



The Conopidae are separated from 

 the Tachinidae, Muscidae, and Antho- 

 myidae by their lack of vibrissae, and 

 also by the disappearance of the vibris- 

 sal angle ; while the cheek-margins, by 

 their vibrissal ridges, either pass almost 



imperceptibly (only with a slight curve 

 — Myopa dorsalis Fab. — below the 

 middle of the face, or on the under edge 

 of the head — Myopa picta) into the 

 edges of the antennal grooves, or else 

 (Conops) reach entirely up to the an- 

 tennal prominence and bound the facial 

 keel, and the antennal grooves are 

 wanting [but this arrangement produces 

 a very good imitation of antennal 

 grooves] . 



The structure is similar in the Oes- 

 tridae, where the vibrissal angles close 

 up the antennal grooves below on both 

 sides high above the oral margin, while 

 the last continues up between the cheek- 

 edges as a broad clypeus with a flat or 

 edged facial keel (Hypoderma). In 

 the Acalyptratae the clypeus forms the 

 edge of the antennal groove below, and 

 the angle is lacking (Dichromyia) . The 

 Cordyluridae, Scatophagidae, Helomy- 

 zidae, Sepsidae, have near the mouth 

 the vibrissal angle and one vibrissa. 

 Head like Macquartia. The boundaries 

 of cheeks, vibrissal ridges, clypeus, etc. 

 are best distinguished in Phasiidae 

 (Trichopoda). 



These parts of the head structure have 

 been already described in general in the 



