The Crane-Flies of New York — 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. Natiu-f. Ges. Bern, p. 132. 



The present knowledge of the life history of Dactylolabis denticulata^ 

 is due to the work of Mik (1894), v/hose 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 bodJ^ 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 

 dehcate 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 diflficult to distinguish in a position of rest, elliptical, margined 

 with blackish brown. 



Pupa. — Length, 8 mm. 

 Width, 1.75 mm. 



