§4 MAINE AGRICULTrRAL EXPKRIMENT STATION. I912. 



North Alt., Ta., North Adams, Alass., (C.W.J.) June; Laval- 

 lette, N. J., (\'ierick) May; Ithaca, N. Y. ! August. 



\'ar. a. Female. Length 3.7 mm. Thorax dark brown, 

 humeri and lateral margins of the mesonotum reddish yellow ; 

 abdomen blackish. Alt. Constitution, Orcas, Id. Wash. 

 (J.M.A.) July. 



31. Genus Mycctopliila Meigen, 



^ 



Illiger's Mag. II. 263, 1803 ; Klass, I, 90, 1804. 



Fungivora JMeigen, Nouv. Class. i6. iSoo, (without type). 



Head placed low on the thorax so that in profile it makes a 

 continuous curve with the thorax, ocelli 2, placed close to the 

 eye margin. Legs stout, tibial setae stout, those of the hind 

 legs longer than the greatest diameter of the tibia. Costa not 

 ])roduced ; subcosta short, incomplete ; cubitus forks nearly 

 imder the fork of the media, its branches nearly parallel apical- 

 ly ; anal vein incomplete. The larvse, which are commonly 

 found in decaying wood and in fungi, possess transverse rows 

 of microscopic ambulacral setuLx upon the margins of the seg- 

 ments of the venter. 



The following table should be considered only as a guide ; 

 and if a specimen be found which cannot be placed, it must not 

 be assumed undescribed without making a careful study of the 

 ]:ypop}-gium, the most reliable single character. Color ana 

 wing markings, and possibly even the number of the setae of 

 the middle tibia are subject to occasional variation. 



Tabic of Species. 



a. Three ranges of setae on the extensor surface of the hind tibia, and 

 with 2 or more setse on flexor surface of middle tibia, 

 b. Wing without a distinct cloud, though the petiole of the media 

 itself may he darkened, 

 c. Thorax subopaque, humeri and posterior lateral angles yellow ; 

 female. i. c.vstincfa. 



cc. Tliorax shining black: hypopygium (Fig. 60). 



2. JHcunda n. sp. 

 1)1). Wing with distinct spots or cloud. 



c. Wing with a single spot which covers the crossvcm. 



d. With 2 seta; on flexor surface of middle tibia; hypopygium 



(Fig. 70). 3. perita n. sp. f^ 



dd. With 3 set?e on flexor surface of middle tibia?; hypopygium 

 (Fig. 68). r. cxstuicta. 



U . tvv M d^i -^ - ■ , ' 1^>' -C^ Wj.'" 



