262 



a short distance from the lateral production. In one species the bands 

 are almost uniform in color, but in the other there is a darker spot on 

 each extremity of the posterior band, and there are 5 slight but ap- 

 preciable interruptions in the dark stripes, giving the dorsum the ap- 

 pearance of having 6 dark longitudinal stripes. The species which has 

 the uniform transverse dorsal abdominal stripes has 5 transverse dark 

 stripes on the ventral surface of each segment, the penultimate one 

 of each series very narrow; the other species has 4 such transverse 

 stripes, and in addition a distinct median longitudinal stripe. The 

 apical segment in both species is as in Figure 13; the lateral pointed 

 blood-gills are retractile. 



Pupa (PI. XXXVIII, Fig. 16). — Entire body without armature, 

 the skin very thin. 



Antennae much flattened, their anterior margin produced bevond 

 the anterior margin of thorax. Thoracic respiratory organs sessile ; 

 scutellum protuberant ; anterior margin of thorax sloping ; wings ex- 

 tending to apex of third segment of abdomen; fore tarsi extending 

 to apex of seventh segment, mid pair to apex of abdomen, hind pair 

 reaching slightly beyond apex. Abdomen unarmed ; seven pairs of 

 spiracles present. 



The foregoing descriptions are based upon examples obtained by 

 the writer at White Heath, III, June 24 and 25, 19 16. I did not ob- 

 serve indications of phosphorescence in the larval and pupal stages, 

 but made no effort to determine whether it existed, owing to mv fail- 

 ure to note the European record until too late to verify it. 



Principal Papers on North American Mycetophiloidea 



Johannsen, 0. A. 



'09- '12. The fungus gnats of North America. Parts 1-4. Bull. 

 Maine Agr. Exper. Station, Nos. 172, 180, 196, 200. (Includes 

 all families in my super-family Mycetophiloidea under Myceto- 

 philidae.) 



Osten Sacken, C. R. 



'62. Characters of the larvae of Myeetophilidae. Proc. Ent. Soc. 

 Phila., 1:151-172. (Includes all the families of my Mycetoph- 

 iloidea, and gives references to previous literature on life histories 

 of the species. 



Schmitz, H. 



'12. Biologisch-anatomische Untersuchungen an einer hohlen- 

 bewohnenden Mycetophilidenlarve, Polylepta leptogrtstcr Winn. 

 Natuurhist. Genootschap in Limburg Jaarboek, 1912, 4th Note. 

 (This species occurs in the United States.) 



