Crane-flies 21 G 



median line; of these the distal one is the longest, the proximal one usually very 

 short; there are three posterior setae on either side, the two proximal being 

 longest and in their own punctures, the third one distal in position, lying close to 

 the black pleural stripe and located in a very small puncture on the margin of the 

 adjoining larger puncture. 



Colouration: Dorsum (PL V, fig. 60) dull yellow. Just inside the broad 

 lateral stripe and separated from it by a narrow bright yellow line is a narrow 

 dark brown line, almost continuous but slightly interrupted in places; this dark 

 line begins on the mesothorax and continues to the last segment. The dorsum of 

 the abdomen between these dark stripes is handsomely marked with dorsal 

 shields of brown which are narrowly margined with darker brown, the narrow 

 apex of the shield directed caudad; there are about seven of these dorsal shields, 

 the integument on either side of them with three bright yellow dots in straight 

 diverging hues, all of these dots lying on the cephahc ring of the segment. 

 Pleural region dark brown, very broad but paler on the thoracic segments, 

 gradually narrowed and becoming darker toward the end of the body, terminating 

 near the anal gills. This dark pleural stripe is dotted with numerous yellowish 

 spots. Ventral surface abruptly and conspicuously light yellow. 



Spiracular disk surrounded by six long, finger-like lobes, the dorsal lobes 

 rather the shortest although still long and finger-hke, lying parallel, the ventral 

 lobes longest; all the lobes narrowly margined with black and with a slender 

 black vitta bisecting the inner face of the lobe from the tip inward toward the 

 disk, at the distal end expanded into a blackish apex; the apex and lateral 

 margins bear long fringes of hairs as in Stygeropis, these hairs being longest 

 toward the tips of the lobes. Anal gills six, short but rather slender, incon- 

 spicuous, the two lateral pairs longest, the inner pair much shorter. 



I would refer this to a position not far removed from Stygeropis 

 although it is very differently coloured from the species last described under that 

 name. However, the structure of the larvse seems to indicate that it is more 

 probably a Stygeropis than a Tipula or a Nephrotoma. If the generic reference 

 is correct the larvae probably belong to either S. parrii or S. parrioides. 



In the specimens from Demarcation point, Alaska, the anterior end of the 

 ,body is pale and the median dorsal shields are continuous as a practically un- 

 interrupted dorso-median line, only shghtly constricted toward the posterior 

 end of each segment; the lateral dorsal stripes are very dark. However, the 

 structure of the spiracular disk and the chaetotaxy are entirely the same and I feel 

 sure that all the material pertains to the same species. 



In the vial containing the two larvae from Bernard harbour, described above, 

 there was an additional Tipuline larva that is closest to the TipuUne No. 3 

 described later, but probably represents a still different species. Because this is 

 the only specimen included in the material it is not further discussed in this 

 report. 



Tipuline No. 2. 



Locality: Three larvae, taken at Demarcation point, Alaska, May, 1914. 

 No. 4 (F. Johansen); melted ponds in the tundra. 



Length, 20-23 mm.; dextro-sinistral width, 3 -3-3 -6 mm.; dorso-ventral 

 depth, 2-2 • 2 mm. 



Body moderately elongated, form strongly depressed; thoracic and first 

 abdominal segments with the margins regular; abdominal segments 3 to 8 with 

 a prominent false constriction or pseudo-suture at about two-thirds the length 

 of the segment, the edges of the segments produced laterad to give a serrate 

 appearance to the margins of the abdomen; the anterior ring of each segment 

 has the serration larger than that of the posterior ring so that these alternate; 

 penultimate segment of the abdomen with the caudal angles produced strongly 

 caudad into long, slender lobes. 



