896 CHARLES PauL ALEXANDER 
insects resemble tiny species of the genus Limnophila. The adult flies 
are not uncommon on rank herbage, especially ferns, in woods and usually 
near running water. As already stated, the immature stages have not 
been reared, but larvae found by the writer in Maine are referred with 
considerable confidence to Adelphomyia americana and A. cayuga, while 
larvae and pupae of another species taken at Ithaca, New York, seem to 
be those of A. minuta. The larvae show a curious combination of tribal 
characters. The general appearance and the structure of the spiracular 
disk are altogether those of one of the Hexatomini; but the head capsule 
and the details of the mouth parts indicate a relationship with the Pedi- 
clini that cannot be denied. 
Adelphomyia minuta Alex. (supposition) 
1911 Adelphomyia minuta Alex. Can. Ent., vol. 43, p. 287-288. 
Adelphomyia minuta is a characteristic late spring species, common in 
boggy woods and on vegetation along rapid streams. Larvae and pupae 
which are referred to this species were sifted from organic mud taken on 
Bool’s hillside, Ithaca, New York, thruout May and early June, 1917. 
The pupae referred to this species strongly resemble those of Dicrano- 
phragma but in reality are very different. The species is discussed 
herewith in the hope that it may be definitely recognized in the future. 
Larva.— Length, 4.5-5 mm.; caudal fringe, 2 mm. additional. 
Diameter, 0.4 mm. 
Coloration, saturated yellow with a faint orange-brown tinge. 
Form narrow, body tapering gradually to both ends, spiracular disk narrowed. Body 
clothed with a delicate appressed pubescence and numerous tufts of conspicuous stiff hairs 
which produce a spiny or bristly appearance; the more conspicuous of these tufts located on 
pleural region, there being three such rows on abdominal segments — one on basal ring, the 
second and largest at base of posterior ring, and the third just before posterior margin of 
segment and more ventral in position; only the large intermediate tuft present on thoracic 
segments, the small brush on anterior annulus of abdominal segments lacking. Spiracular 
disk (Plate LIX, 305) with four lobes; ventral pair not more than three times length of lateral 
pair; inner face of lobes margined with brown; at tip of ventral lobes a fringe of exceedingly 
elongate hairs, which are from one-third to nearly one-half length of entire body and about 
fifteen times length of lobes bearing them; a stiff sensory bristle located in black margin 
at tip of lobe; lateral lobes with fringe of hairs relatively much shorter, tho still long. 
Spiracles large, close together, separated by a distance less than diameter of one, the middle 
piece black, the ring pale yellow. Anal gills four, slender, hyaline, each subdivided by con- 
strictions into four lobes which are gradually narrowed from the base outward, the last being 
cylindrical. 
