Tue CrRANE-F irs or New YorkK — Part II 853 
Pupa.— Somewhat similar to pupae of Limnophilaria. Pronotal breathing horns short 
and cylindrical. In some species, at least, second abdominal segment with a very large and 
prominent lateral spiracle. 
Dactylolabis is a small genus including about thirteen known species 
which are about equally well distributed in Europe and North America. 
Dactylolabis denticulata (Bergr.) 
1891 Limnophila denticulata Bergr. Mittheil. Naturf. Ges. Bern, p. 132. 
The present knowledge of the life history of Dactyloladis denticulata 
is due to the work of Mik (1894), whose paper is cited by other workers, 
among them Griinberg (1910:54-55). ; 
Larvae and pupae were found on the dark brownish gray chalk cliffs 
near Steiermark on August 3, 1891. In certain places on the cliffs were 
broad or narrow bands of black. The larvae and the pupae were found 
along these dark bands and showed a decided resemblance to their sur- 
roundings. The surface of the rock was wet with dripping water, which 
supported a flora of lowly plant organisms on which the larvae presumably 
fed. The adherence of the pupa to the last larval skin is of interest since 
it presumably aids in the emergence of the adult. A similar condition 
is found in Cylindrotoma. ‘ 
Larva.— Length, 7 mm. 
Width, 2 mm. 
Form very depressed (Plate XLI, 183), the ventral surface flattened, almost leechlike. 
Both dorsal and ventral surface provided with hairs, with longer and more numerous hairs 
on sides of body. Body covered with small, black, structureless particles of earth or excre- 
ment, more numerous near margins of dorsal surface, these particles lacking a definite arrange- 
ment and being very firmly attached to the body hairs; when particles are removed, larva 
is of a greenish gray color, subhyaline. Abdominal segments divided into two rings bearing 
long hairs which are more conspicuous on sides of body. Head capsule (Plate XLI, 182) 
small but compact, completely retractile within prothoracic segment. Labrum relatively 
large and semitransparent, the margins with long hairs; on dorsum on either side a long 
delicate seta. Mentum chitinized; anterior margin with seven teeth, behind median tooth 
a brush of hairs. Antenna two-segmented; basal segment cylindrical; second segment 
button-like, with apex pointed. Mandible three-toothed; a tuft of hairs at prosthecal region. 
Spiracular disk surrounded by two fleshy welts which are deeply incised medially to appear 
as four blunt lobes. Spiracles difficult to distinguish in a position of rest, elliptical, margined 
with blackish brown. 
Pupa.— Length, 8 mm. 
Width, 1.75 mm. 
