201 



A larva which was assumed to be of this species was described 

 by Needham, as cited above. The markings given in that description 

 appear to justify me in considering the species following as distinct 

 from abdominalis. 



TiPULA sp. 3 



Larva. — Length when full-grown, 50 mm. Dark greenish 

 brown, with :S continuous moderately broad longitudinal vittae on 

 dorsum, a dark brown median vitta, and a number of isolated pale 

 dots; surface hairs set in small blackish or dark brown dots. 



Head rather small in comparison with size of larva, lateral view 

 as in Figure 4. Plate XXXII ; antennae normal in size ; labial plate 

 (PI. XXXII, Fig. 6) with one very large central tooth, with more or 

 less distinct shoulders, and 3 smaller lateral teeth; hypopharynx (PI. 

 XXXI, Fig. 12) with anterior margin of upper plate slightly convex, 

 the central tooth of the five the largest. Body similar in general 

 structure to that of Species 2, but the apical segment very different, 

 quite closely resembling that of Species 4 except that the ventral 

 blood-gills are distinctly shorter and stouter. 



Described from specimens obtained by Dr. S. A. Forbes in Black- 

 tail Deer Creek, August 28, 1890, and in Slough Creek August 30, 

 1 89 1 — both in Yellowstone National Park. 



TiPULA sp. 4 



Larva. — Agrees in general appearance and armature of the 

 abdominal segments with eluta, but differs in being much larger 

 (50 mm.) and in having the apical abdominal radiating processes 

 much less acute (PI. XXXI, Fig. 5). The head agrees closely with 

 that of Species 3, the labium (PI. XXXII, Fig. 9) and hypopharynx 

 (PI. XXXI, Fig. 15) being of the same general structure, dififering 

 only in having the former narrower and more acute anteriorly ; f ronto- 

 clypeal region as in Figure 4, Plate XXXI ; mandibles as in Figure 

 26, Plate XXXII. 



Specimens are in our collection from Ithaca, N. Y. (March 21, 

 1897). 



TiPULA Sp. 5 



Larva (PI. XXIX, Fig. 3). — Length, 27 mm. Separable from 

 other species that do not have the long slender blood-gills on apical 

 abdominal segment by a pair of slight elevations or tubercles on the 

 dorsum of the anterior third of the prothoracic segment, and by the 

 peculiar formation of the apical segment, shown in Figures 7 and 8, 



