850. CHARLES PauL ALEXANDER 
It is probable that other groups of species of the old genus Limnophila 
will be found to deviate from the characters of this group as now restricted. 
Species such as L. hyalipennis (Zett.), L. nemoralis (Meig.), and others in 
Europe, and L. brevifurca, L. emmelina, L. mundoides, L. toxoneura, 
L. ultima, and similar anomalous forms in America, should be investigated 
critically when opportunity offers. 
Pseudolimnophila luteipennis (O. 8.) 
1859 Limnophila lutetpennis O.S. Proc. Acad. Nat. Sci. Phila., p. 236. 
Pseudolimnophila luteipennis is one of the most abundant species of 
the tribe, and is very widely distributed thruout eastern North America. 
The adult flies are common in swamps and along the marshy edges of 
streams and ponds. The immature stages are characteristic swamp 
inhabitants. They have been described in detail by Hart (1898 [1895]: 
202-204). Malloch (1915-17 b: 222-223) adds several supplementary notes 
and figures of Hart’s material. 
Larva.— Length, 15-18 mm. 
Diameter, 1.5-1.7 mm. 
Coloration light brownish yellow, slightly darker toward posterior end of body. 
Body covered with a delicate appressed brownish pubescence and abundant stiff bristles 
and erect hairs on each segment, arranged in about five transverse rows; these bristles more 
numerous, coarser, and blacker, on posterior segments, forming a Jarge tuft on sides of 
penultimate segment of body. Spiracular disk (Plate XX XIX, 176) surrounded by four 
lobes, the posterior pair very long and slender, finger-like, the lateral pair much shorter but 
slender; the inner face of these lobes with brownish black or dark brown transverse lines which 
cover almost the entire face; an arcuate line extending from ends of ventral marks across disk 
between spiracles; two small triangular marks located between ventral lobes; lobes fringed 
with long, delicate hairs, those at ends very elongate, those toward base of lobes shortened 
but continuous around disk. Anal gills four, very long and slender, exceeding ventral lobes 
of spiracular disk. 
Head capsule short and stout, exhibiting a very generalized condition. Prefrons very 
broad, only slightly narrowed behind and but slightly exceeding lateral plates. Labrum 
broadly transverse, with a large tuft of hairs on either side. Mentum (Plate XX XIX, 172) 
completely divided, each half with seven (or rarely eight) teeth along anterior margin, of 
which the third (or fourth) from the inside is the largest; a flattened lobe just laterad of each 
half of mentum; mental plates continuous behind with strong lateral plates of capsule; in 
a normal position the two halves of mentum overlying each other to a greater or less degree. 
Hypopharynx (Plate XX XIX, 173) with anterior margin broadly rounded, with numerous 
(from ten to fifteen) bluntly rounded teeth. Antenna slender, with two long apical 
‘papillae. Mandible (Plate XX XIX, 175) short and broad, of the generalized limnobiine 
