322 MAINE AGRICUI^TURAI, EXPERIMENT, STATION. I9II. 



Sciophilinae. 

 Bctrepesthoneura was erected to contain Tetragoneura hirta. 

 In this genus the subcosta ends in Ri and the petiole of the cubi- 

 tus is very short, thus distinguishing it from Tetragoneura. 

 Scotella was referred to the Mycetobiinae by Dr. Enderlein but 

 I am inclined to interpret the homology of the wing veins dif- 

 ferently. In the figure given by him (Tran. Linn. Soc. p. 61) 

 the veins marked cu and ax I consider to be M and cu respect- 

 ively. This genus may be separated from Paratinia by the 

 elongate petiole of the radial sector, and the presence of scales 

 on thorax and abdomen. Pleonazoneura and Neurocompsa are 

 both related to Neoempheria from which they differ in having 

 a distinct vein between R and M instead of merely a fold. The 

 second genus is distinguished further in having an accessory 

 crossvein. 



Mycetophilinae. 

 Aphanizophleps is an aberrant form with defective venation 

 probably related to the Sciarinae, resembling Manota from 

 which it is distinguished by the position of the lateral ocelli close 

 to the eye margin. Leiella closely resembles RondanieUa, but it 

 has only 2 ocelli, and the basal section of Rs is lacking. 

 Megalopehna, a genus split off from Phthinia, differs in having 

 the subcostal crossvein placed distad of the base of Rs. The 

 American species P. fraudulenta no doubt belongs here. 

 Platurocypta has but 2 ocelli, and a depressed instead of a com.- 

 pressed abdomen, differing in these respects from Epicynta. 

 Plastacephala may be distinguished from Mycetophila by the 

 form of the abdomen which is depressed instead of compressed. 

 Platyprosthiogyne resembles Zygomyia but it has its costa pro- 

 duced, the ocelli but 2 in number, and a depressed abdomen. 



