898 CHARLES PauL ALEXANDER 
8 swollen, with four blunt lobes, the posterior pair large, with their posterior faces setiferous. 
Female cauda (Plate LX, 308) with sternal valves much shorter than tergal valves and rather 
blunt at tips; tergal valves broad at base, narrowed at tips, which terminate in acute black 
spines, situated on lateral margin before apex, the spines directed dorsad, laterad, and caudad. 
The larvae were common near Ithaca, New York, from May 10 to 
June 5, 1917. The pupae are described from one male and two females 
washed from mud from Bool’s hillside, at Ithaca, on June 11, 1917. A 
little later in June adult flies of this species were common at this location. 
Adelphomyia americana Alex. (supposition) 
1912 Adelphomyia americana Alex. Pomona Journ. Ent., vol. 4, p. 829-831. 
Larvae that were rather common in the rich organie mud from the 
Standpipe Woods, Orono, Maine, from July 1 to 14, 1918, are referred 
with some doubt to Adelphomyia americana. They are unquestionably 
congeneric with the species last described (A. minuta, supposition) and 
with the form discussed in the following pages as A. cayuga. A short 
time after the larvae of these three species were obtained, the aduit ‘flies 
appeared in considerable numbers in the same situations and there seems 
to be but little doubt as to the reference. Associated with the larvae 
of this species in the organic mud were a few larvae of Penthoptera, 
Rhaphidolabis, and other species of crane-flies. 
The larva of the present species averages larger than that of A. minuta, 
when fully grown measuring 5.5 millimeters in length. In coloration 
it is light yellow. The ventral lobes of the spiracular disk have the dar 
markings on their inner face much more extensive, the apical half bein 
suffused with brown. The mouth parts are similar to those of A. mznut 
as described, but the outermost of the two large teeth of each half of th 
mentum is reduced in size so that only a single tooth is of conspicuous size. 
(Described from larvae taken at Orono, Maine. No. 66-1913.) 
Adelphomyia cayuga Alex. (supposition) 
1912 Adelphomyia cayuga Alex. Pomona Journ. Ent., vol. 4, p. 831. 
The supposed larva of Adelphomyia cayuga occurred with specimens 
of the preceding (A. americana, supposition) at Orono, Maine, from July 
1 to 13, 1913. This is a smaller species than the preceding, measurin 
but 4 millimeters in length, and is much paler, the color being almos 
